Latest Articles from Acta Ichthyologica et Piscatoria Latest 23 Articles from Acta Ichthyologica et Piscatoria https://aiep.pensoft.net/ Fri, 29 Mar 2024 04:07:37 +0200 Pensoft FeedCreator https://aiep.pensoft.net/i/logo.jpg Latest Articles from Acta Ichthyologica et Piscatoria https://aiep.pensoft.net/ First Southern Hemisphere record of the longnosed stargazer, Ichthyscopus lebeck (Actinopterygii: Perciformes: Uranoscopidae) https://aiep.pensoft.net/article/113513/ Acta Ichthyologica et Piscatoria 54: 37-41

DOI: 10.3897/aiep.54.113513

Authors: Gino V. Limmon, Kunto Wibowo, Teguh Peristiwady, Ruby V. Kusumah, Muhammad Afrisal

Abstract: Two specimens (290.2 and 309.5 mm in standard length) of the longnosed stargazer, Ichthyscopus lebeck (Bloch et Schneider, 1801), were recently collected from Jakarta Bay, Jakarta, Indonesia. Described more than two centuries ago, I. lebeck has hitherto been documented exclusively from the Northern Hemisphere, encompassing the Arabian Sea, southern coastal India, the Bay of Bengal, the Andaman Sea, and Singapore. The present paper documents the first record of the species in the Southern Hemisphere. Detailed descriptions of these specimens are provided, contributing valuable insights into the characteristics of I. lebeck in the newly reported locality.

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Short Communication Mon, 5 Feb 2024 07:37:41 +0200
Comparative phylogeography of two codistributed species of the genus Herichthys (Actinopterygii: Cichliformes: Cichlidae) in northeastern Mexico https://aiep.pensoft.net/article/112183/ Acta Ichthyologica et Piscatoria 53: 227-242

DOI: 10.3897/aiep.53.112183

Authors: Fabian Pérez-Miranda, Omar Mejía, Benjamín López, Eduardo Soto-Galera, Amairany Bernal-Portillo, Wilfredo A. Matamoros

Abstract: Phylogeographic patterns of freshwater fishes in coastal regions are highly susceptible to eustatic sea level changes associated with Pleistocene glaciations. In this context, the Plain Coastal Gulf in northeastern Mexico represents an ideal study area due to its low elevation. Herein, we compare the phylogeographic structures of two cichlid species of the genus Herichthys Baird et Girard, 1854 widely distributed in the Pánuco–Tamesí system in northeastern Mexico using two mitochondrial markers. The species studied were: Herichthys carpintis (Jordan et Snyder, 1899) and Herichthys pantostictus (Taylor et Miller, 1983). We estimate their genetic diversity, gene flow, and demographic history and perform biogeographic reconstructions using a Bayesian computation approach and environmental niche modeling. The biogeographic reconstruction suggests a different history for each species. Environmental niche modeling indicates that both species experienced a demographic expansion during the Pleistocene but responded differently to Pleistocene climatic changes. In summary, their current sympatric distribution could be the outcome of contemporary and not historical processes reflecting a pseudo-incongruent pattern.

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Research Article Thu, 7 Dec 2023 14:37:23 +0200
Graded levels of dietary pink oyster mushroom, Pleurotus djamor meal, affect growth, feed efficiency, lipase activity, and fiber content in final whole body of fingerlings of the Nile tilapia, Oreochromis niloticus (Actinopterygii: Cichliformes: Cichlidae) https://aiep.pensoft.net/article/105367/ Acta Ichthyologica et Piscatoria 53: 163-172

DOI: 10.3897/aiep.53.105367

Authors: Mario Eduardo Sosa, Silvia Cappello-García, Rafael Martínez-García, Susana Camarillo-Coop, Rocío Guerrero-Zarate, Otilio Méndez-Marín, Carlos Alfonso Álvarez-Gonzaléz, Uriel Rodríguez-Estrada

Abstract: The presently reported study was aimed to determine the effects of graded levels of dietary pink oyster mushroom (Pleurotus djamor) meal (POMM), in growth, feed efficiency, protein utilization, digestive enzymes activities, and whole-body proximate composition of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758), fingerlings (0.3 ± 0.01 g). The experimental design included a control diet (POMM0) formulated with soybean meal, as the main protein source, and four diets designed with increasing levels of POMM: 25% (POMM25); 50% (POMM50); 75% (POMM75); and 100% (POMM100). Experimental diets were administered to 420 fish, randomly distributed in 15, 100-L tanks. The feeding experiment lasted 45 days. Diets and the final whole body were submitted to a proximate composition analysis. Growth, feed efficiency, protein utilization, and digestive enzyme activities were assessed. Compared to POMM0 and POMM25, weight gain (WG), and specific growth rate (SGR), significantly (P < 0.05) decreased in fish that were fed POMM50, POMM75, and POMM100%. Feed conversion ratio (FCR), protein efficiency ratio (PER), and survival rate (SR) were not significantly affected by experimental diets. Daily feed intake (DFI), and daily protein intake (DPI), decreased as POMM increased in diets. Compared to POMM0 experimental group, condition factor (K), showed a significantly higher value in fish that were fed POMM50, and POMM100 experimental diets. Crude fiber of the final whole body of POMM100 resulted in significantly higher (P < 0.05) compared to that shown in fish fed the rest of the experimental diets. Acid and alkaline proteases, trypsin, chymotrypsin, leucine aminopeptidase, and amylase of Nile tilapia fingerlings, were not significantly affected by experimental diets. Compared to fish fed POMM0 and POMM25 diets, experimental fish fed POMM50, POMM75, and POMM100 showed a reduction in lipase activity. In conclusion, a POMM level higher than 25% affects growth and lipase activity. While a POMM level higher than 50% affects fiber content in a whole body of the final fish.

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Research Article Mon, 23 Oct 2023 19:06:37 +0300
Infection parameters of Norileca indica and a new record of Ceratothoa carinata (Crustacea: Isopoda: Cymothoidae) on Selar crumenophthalmus (Actinopterygii: Carangiformes: Carangidae) in the waters of the Sibuyan Sea, the Philippines https://aiep.pensoft.net/article/108918/ Acta Ichthyologica et Piscatoria 53: 147-155

DOI: 10.3897/aiep.53.108918

Authors: Sanny David P. Lumayno, Hannah Kathleen S. Labrador, Kyle Dominic E. Barnuevo, Roxanne A. Cabebe-Barnuevo, Rowena E. Cadiz, Ricardo P. Babaran

Abstract: Studies on cymothoid isopods as parasites affecting the marine fisheries and aquaculture industries are relatively scarce in the Philippines despite having detrimental impacts on their fish hosts. Parasitological examination on the bigeye scad, Selar crumenophthalmus (Bloch, 1793), a potential aquaculture species, in the waters of the Sibuyan Sea, Philippines was done on fish specimens collected on 21 April 2021. Out of the 88 specimens, a total of 13 big eye scads were infected with cymothoid isopod Norileca indica (Milne Edwards, 1840), found in the branchial cavities of the fish, resulting in a prevalence of 14.77%. A total of 20 individual isopods (13 females and seven males) were recovered, with a mean intensity of 1.53. Based on the morphological characteristics and as confirmed by the cytochrome oxidase subunit 1 (CO1) sequence, one host fish was also infected with Ceratothoa carinata (Bianconi, 1869). This appears to be the first record of C. carinata from the Philippines. To fully understand the implications of cymothoid parasites on the bigeye scad, further studies are recommended to account for the impacts of seasonality, reproductive stages of the host fish, and effects of abiotic factors such as water movement and depth.

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Research Article Fri, 6 Oct 2023 11:56:34 +0300
A new record of Upeneus pori (Actinopterygii: Syngnathiformes: Mullidae) from the South China Sea: Integrating morphology and DNA barcoding https://aiep.pensoft.net/article/103343/ Acta Ichthyologica et Piscatoria 53: 137-145

DOI: 10.3897/aiep.53.103343

Authors: Zhisen Luo, Murong Yi, Sui Gu, Hung-Du Lin, Yunrong Yan

Abstract: This study constitutes the first record of the Por’s goatfish, Upeneus pori Ben-Tuvia et Golani, 1989, from the South China Sea. This fish had formerly only been reported in the western Indian Ocean. Six specimens of U. pori collected from the South China Sea were identified through comparisons of morphology and molecular analysis. Upeneus pori and Upeneus tragula Richardson, 1846 are very similar. The difference is that the former has seven spines in the first dorsal fin, lacks any spots or blotches on its body, and exhibits white or creamy white barbels. The latter has eight spines in the first dorsal fin, exhibits black spots on its body, and displays orange-colored barbels, along with different caudal fin patterns. Pairwise genetic distance computation demonstrated that U. pori exhibits a very low genetic distance from sequences of the other three recorded U. pori species found in the type locality of Israel, Red Sea, as documented in GenBank. These findings provide compelling evidence of the Por’s goatfish’s presence in the South China Sea.

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Research Article Mon, 2 Oct 2023 10:01:00 +0300
New record of Chromis weberi (Actinopterygii: Ovalentaria: Pomacentridae) from Jeju Island, southern Korea https://aiep.pensoft.net/article/103531/ Acta Ichthyologica et Piscatoria 53: 89-94

DOI: 10.3897/aiep.53.103531

Authors: Se Hun Myoung, Jung-Goo Myoung, Min-Su Woo, Maeng Jin Kim, Min Gu Kang, Joo Myun Park

Abstract: Discovering tropical marine species outside of their distribution limits is important for evaluating the impact of climate change on marine ecosystems. One specimen (31.6 mm standard length) of a tropical fish, Chromis weberi Fowler et Bean, 1928, representing the family Pomacentridae, was first recorded from Jeju Island, Korea, on 8 December 2021. It was characterized by black posterior margins of the preopercle and opercle and black upper and lower lobes of the caudal fin. A specimen of this species collected from Munseom was distinguished from Chromis xanthura (Bleeker, 1854) based on distinct differences in the tips of the upper and lower caudal fin lobes, which are not black in C. xanthura. In addition, C. weberi was easily distinguished from the other four species in the genus Chromis, by the mitochondrial DNA cytochrome c oxidase subunit I gene sequence (345 bp), with genetic distances ranging from 0.130 to 0.252. This study documents the first record of C. weberi in temperate Korean waters, implying a poleward range expansion for this species. The Korean name ‘geom-eun-jeom-ggo-ri-ja-ri-dom’ has been proposed for C. weberi.

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Short Communication Tue, 6 Jun 2023 17:45:20 +0300
First record and new size record for the oceanic species Psenes sio (Actinopterygii: Scombriformes: Nomeidae) in the northern Gulf of California, Mexico https://aiep.pensoft.net/article/96130/ Acta Ichthyologica et Piscatoria 52(4): 273-278

DOI: 10.3897/aiep.52.96130

Authors: Uriel Rubio-Rodríguez, Carlos A. Godínez-Pérez, Airam N. Sarmiento-Lezcano

Abstract: The biological information for many species of the family Nomeidae is scarce, given the difficulty of capturing these species in the oceanic environment. A specimen of the twospine driftfish, Psenes sio Haedrich, 1970, was collected in the northern Gulf of California with a bottom trawl net at the depth of more than 250 m. This specimen represents the northernmost record of this species to date, and provides valuable information on this fish, such as maximum weight and height recorded, vertical distribution and latitudinal range, in addition to meristic counts and body morphometry.

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Short Communication Fri, 16 Dec 2022 07:32:08 +0200
First report of abnormal body coloration in Sebastes koreanus (Actinopterygii: Perciformes: Sebastinae) https://aiep.pensoft.net/article/89592/ Acta Ichthyologica et Piscatoria 52(3): 209-213

DOI: 10.3897/aiep.52.89592

Authors: Se Hun Myoung, Jung-Goo Myoung, Laith A. Jawad, Maeng Jin Kim, Joo Myun Park

Abstract: This study reports the first record of abnormal coloration in Sebastes koreanus Kim et Lee, 1994. The specimen (163.4 mm standard length and 197.3 mm total length) was collected from the Yellow Sea in South Korea in July 2021. The whole body of the specimens was red, and all fins also had red coloration while the slight dark red pattern under the eyes and dark spot on the opercula were similar to normal S. koreanus. It also showed a similar dotted pattern on the pectoral fins with a normal specimen.

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Short Communication Fri, 23 Sep 2022 10:56:33 +0300
Length–weight relation for seven Neotropical freshwater fish species (Actinopterygii) endemic to Central America https://aiep.pensoft.net/article/86467/ Acta Ichthyologica et Piscatoria 52(3): 183-187

DOI: 10.3897/aiep.52.86467

Authors: Justin C. Bagley, Maria Florencia Breitman, Jerald B. Johnson

Abstract: In the presently reported study, we estimated length–weight relation (LWRs) for seven species of freshwater fishes from Central America. Samples were collected using seines from 60 sites across Nicaragua, Costa Rica, and Panama during field expeditions conducted between 1997 and 2012. The fishes were preserved and transported to the lab, where their total weight (W) was measured (to nearest 0.0001 g) and standard lengths were taken (to nearest 0.01 mm). Data were collected from four livebearers (Poeciliidae), Alfaro cultratus (Regan, 1908), Phallichthys amates (Miller, 1907), Poecilia gillii (Kner, 1863), and Priapichthys annectens (Regan, 1907); the cichlids (Cichlidae), Parachromis dovii (Günther, 1864) and Parachromis managuensis (Günther, 1867); and a silverside (Atherinopsidae), Atherinella hubbsi (Bussing, 1979). Estimates of parameter b ranged from 2.936 (A. hubbsi) to 3.696 (P. gillii), while estimates of parameter a ranged from 1.7 × 10−6 (P. gillii) to 1.9 × 10−5 (P. managuensis). Parameter b estimates were greater than three, consistent with allometric growth, with the exception of P. annectens, P. managuensis, and A. hubbsi, for which t-tests failed to reject the null hypothesis of isometric growth. Our results provide the first LWR information for five (71%) of these species and may prove useful for data imputation or estimating the biomass of poeciliid, cichlid, and atheriniform fishes in Central American rivers in the future.

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Short Communication Tue, 2 Aug 2022 16:57:13 +0300
First record of butterflyfish, Roa haraguchiae (Actinopterygii: Perciformes: Chaetodontidae), from northeast Taiwan https://aiep.pensoft.net/article/82342/ Acta Ichthyologica et Piscatoria 52(2): 141-148

DOI: 10.3897/aiep.52.82342

Authors: Shu-Ling Lee, Yung-Chieh Chiu, Hong-Ming Chen

Abstract: A recently-described butterflyfish, Roa haraguchiae Uejo, Senou et Motomura, 2020, is herewith for the first time reported from northeast Taiwan. In Taiwan, the genus Roa has been known represented by a single species, Roa modesta (Temminck et Schlegel, 1844). This study presents a comparison of R. haraguchiae with its congeners and includes diagnostic characters on the basis of morphology and genetic differences by life-barcoding. Our specimens have some differences that may be attributed to the individual variations, which are compared and discussed.

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Research Article Thu, 7 Jul 2022 10:34:12 +0300
Length–weight relations of ten freshwater fish species (Actinopterygii) from Abashiri River basin, eastern Hokkaido, Japan https://aiep.pensoft.net/article/81301/ Acta Ichthyologica et Piscatoria 52(2): 95-99

DOI: 10.3897/aiep.52.81301

Authors: Atsuya Yamamoto, Kota Tabata, Tomohiro Fukushige, Takuya Inoue, Hiroaki Furutsu, Michihisa Hiroya, Minoru Kanaiwa

Abstract: Length–weight relations (LWRs) were estimated for ten freshwater fish species such as gin-buna, Carassius langsdorfii Temminck et Schlegel, 1846; lake minnow, Rhynchocypris percnura (Pallas, 1814); Siberian loach, Barbatula toni (Dybowski, 1869); Japanese smelt, Hypomesus nipponensis McAllister, 1963; masu salmon, Oncorhynchus masou (Brevoort, 1856); rainbow trout, Oncorhynchus mykiss (Walbaum, 1792); whitespotted char, Salvelinus leucomaenis (Pallas, 1814); ninespine stickleback, Pungitius pungitius (Linnaeus, 1758); hana-kajika, Cottus nozawae Synder, 1911; and a species of goby Rhinogobius sp. Specimens were collected once a month except in the snow season from the Abashiri River basin, eastern Hokkaido, between June 2007 and November 2011. Fishes were captured by an electrofishing device (Smith–Root Inc., Model 12-b). The estimated allometric coefficient b values ranged from 2.790 (ninespine stickleback) to 3.294 (hana-kajika), and r2 values ranged from 0.772 (lake minnow) to 0.994 (goby). All the LWRs were highly significant, with P < 0.001. Besides, the study provides the first estimates of LWRs for the Siberian loach, Japanese smelt, masu salmon, whitespotted char, hana-kajika, and the goby.

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Short Communication Tue, 12 Apr 2022 14:44:07 +0300
Diet seasonality and food overlap of Perca fluviatilis (Actinopterygii: Perciformes: Percidae) and Rutilus rutilus (Actinopterygii: Cypriniformes: Cyprinidae) juveniles: A case study on Bovan Reservoir, Serbia https://aiep.pensoft.net/article/78215/ Acta Ichthyologica et Piscatoria 52(1): 77-90

DOI: 10.3897/aiep.52.78215

Authors: Milena Radenković, Milica Stojković Piperac, Aleksandra Milošković, Nataša Kojadinović, Simona Đuretanović, Tijana Veličković, Marija Jakovljević, Marijana Nikolić, Vladica Simić

Abstract: European perch, Perca fluviatilis Linnaeus, 1758 and roach, Rutilus rutilus (Linnaeus, 1758) are the most common species present in mesotrophic and eutrophic lakes throughout Europe. Their biomass, especially in juvenile stages, contributes the most to the fish production of these ecosystems. In Bovan Reservoir, these two species constitute the bulk of the juvenile fish biomass. This study aimed to investigate the feeding composition of these two species in order to evaluate their niche overlap due to the availability of resources during different seasons. Traditional diet analysis indices and Kohonen artificial neural network (i.e., a self-organizing map, SOM) were used to investigate the diet of 158 individuals of both species and evaluate their food niche overlap. The indicator value (IndVal) was applied to identify indicator food categories based on which the contents of their alimentary tracts were grouped first into neurons and then into clusters on the SOM. Our results showed that juvenile fish used zooplankton and benthic prey in their diet. Roach often fed on nonanimal prey, while perch of age 0+ used fishes in the diet. Additionally, four clusters of neurons were isolated on the SOM output network. The distribution of perch and roach alimentary tracts in neurons indicated no high degree of competition between them. While diet analyses indices show which food category is generally important in specimensʼ diet, the SOM recognizes those specimens and arranges them together into the same or adjacent neurons based on dominant prey. Understanding fish feeding habits is critical for the development of conservation and management plans. Since Bovan is a eutrophic reservoir, our knowledge of fish feeding habits needs to be considered for stocking strategies in the future.

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Research Article Tue, 29 Mar 2022 22:13:57 +0300
Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management https://aiep.pensoft.net/article/80586/ Acta Ichthyologica et Piscatoria 52(1): 53-65

DOI: 10.3897/aiep.52.80586

Authors: Ken Longenecker, Erik C. Franklin, Renee Hill-Lewenilovo, Watisoni Lalavanua, Ross Langston, Sangeeta Mangubhai, Susanna Piovano

Abstract: Data-limited fisheries benefit from using life-history traits as biological indicators of targeted stocks. We used histology-based reproductive analyses to estimate size at maturity, per capita egg production, and the number and biomass of immature individuals in the catch for three common coral reef fishes in Fiji market surveys during 2010–2019. We studied Lutjanus gibbus (Forsskål, 1775), Parupeneus indicus (Shaw, 1803), and Chlorurus microrhinos (Bleeker, 1854), which represent three families: Lutjanidae, Mullidae, and Scaridae, respectively. Fork length comprising 50% mature individuals for females of L. gibbus was 22.7 cm, that of P. indicus was 25.9 cm, attaining 38.0 cm for C. microrhinos. Females were rare or absent in the largest size classes of all three species. Immature fish represented up to 50% by number and 41% by biomass of the catch in market surveys, with P. indicus having the greatest immature number (8%‒50%) and biomass (6%‒41%), followed by C. microrhinos (20%‒30% by count, 11%‒18% by biomass) and L. gibbus (9%‒28% by count, 5%‒14% by biomass). Individuals ≤ 30 cm for L. gibbus and P. indicus and ≤ 45 cm for C. microrhinos were responsible for ≥ 90% of egg production per spawning. Skewed size-specific sex ratios suggested that exploitation of the largest size classes had minimal effect on overall egg production. Decreased catches of immature fishes would increase the reproductive population sizes for these species.

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Research Article Tue, 29 Mar 2022 22:13:52 +0300
Revalidation of the genus Ichthyocoris Bonaparte, 1840 (Actinopterygii: Blenniiformes: Blenniidae) https://aiep.pensoft.net/article/79458/ Acta Ichthyologica et Piscatoria 52(1): 35-41

DOI: 10.3897/aiep.52.79458

Authors: Emma Duquenne-Delobel, Ignacio Doadrio, Gaël P. J. Denys

Abstract: Combtooth blennies belonging to the genus Salaria were known to have marine and freshwater species. However, recent molecular studies highlighted this genus as paraphyletic, clearly distinguishing both marine and freshwater species. In this paper, we revalidate the genus Ichthyocoris, which corresponds to the freshwater species: Ichthyocoris atlantica (Doadrio, Perea et Yahyaoui, 2011), new combination, Ichthyocoris economidisi (Kottelat, 2004), new combination, and Ichthyocoris fluviatilis (Asso y del Rio, 1801), new combination. It is distinguishable by the presence of brownish bars on the flanks not contrasted with black dots conferring a marble coat, a dorsal fin slightly notched between spined and soft rays (except for I. atlantica), 16–18 dorsal-fin soft rays, 16–20 anal-fin soft rays, 34–38 vertebrae, 8–9 circumorbital pores, 8–11 preopercular pores, and 3 supratemporal pores. The genus Salaria corresponds to the marine species Salaria basilisca (Valenciennes, 1836) and Salaria pavo (Risso, 1810).

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Research Article Tue, 29 Mar 2022 13:25:24 +0300
First records of the two gobies, Cryptocentrus shigensis and Priolepis profunda (Actinopterygii: Gobiiformes: Gobiidae), from the Andaman Sea https://aiep.pensoft.net/article/71241/ Acta Ichthyologica et Piscatoria 52(1): 21-27

DOI: 10.3897/aiep.52.71241

Authors: Kyoji Fujiwara, Peter N. Psomadakis, Thet Yu Yu Swe, Hiroyuki Motomura

Abstract: Single specimens of Cryptocentrus shigensis Kuroda, 1956 (41.1 mm standard length: SL) and Priolepis profunda (Weber, 1909) (24.4 mm SL) represent the first specimen-supported records of those species from the Andaman Sea. Notably, the specimen of C. shigensis represents the first Indian Ocean record, the species having been previously recorded only from southern Japan and Palau. Full descriptions of the specimens are provided.

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Research Article Mon, 14 Mar 2022 10:21:19 +0200
New records of recently described Zebrus pallaoroi (Actinopterygii: Gobiiformes: Gobiidae) with notes on its morphology, ecology, and molecular identification https://aiep.pensoft.net/article/79723/ Acta Ichthyologica et Piscatoria 52(1): 13-19

DOI: 10.3897/aiep.52.79723

Authors: Marcelo Kovačić, Branko Dragičević, Mišo Pavičić, Iva Žužul, Tanja Šegvić-Bubić

Abstract: The family Gobiidae represents the species-richest family of fishes in the Mediterranean Sea. However, many Mediterranean gobiid species are poorly known with just one or few species records in total. Among those species, the recently described Zebrus pallaoroi Kovačić, Šanda et Vukić, 2021 has been known only from the localities in the species description: the southern Adriatic, northern Ionian, and northern and western Aegean seas. The additional specimens of this species were collected in central and northern Adriatic Sea. The identification was confirmed by morphological and genetic methods. The morphological and preserved coloration characters were compared with the data from the limited type material and the alternative preserved coloration diagnostic character was suggested. The first data on alive and freshly dead coloration are reported. The phylogenetic analysis was performed on sequenced COI, cytochrome b, and rhodopsin genes. The analyzed molecular markers placed Z. pallaoroi in a distinct clade within Zebrus–Millerigobius group. The preference of this species for the very shallow habitat is confirmed and discussed.

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Research Article Tue, 8 Mar 2022 16:20:40 +0200
Morphometric variation of Middle-American cichlids: Theraps– Paraneetroplus clade (Actinopterygii: Cichliformes: Cichlidae) https://aiep.pensoft.net/article/69363/ Acta Ichthyologica et Piscatoria 51(4): 403-412

DOI: 10.3897/aiep.51.69363

Authors: Yanet Elizabeth Aguilar-Contreras, Alfonso A. González-Díaz, Omar Mejía, Rocío Rodiles-Hernández

Abstract: This study assesses the patterns of variation in body shape, and relations of morphological similarity among species of the Theraps–Paraneetroplus clade in order to determine whether body shape may be a trait in phylogenetic relations. A total of 208 specimens belonging to 10 species of the Theraps–Paraneetroplus clade were examined. The left side of each specimen was photographed; in each photograph, 27 fixed landmarks were placed to identify patterns in body shape variation. Images were processed by using geometric morphometrics, followed by a phylogenetic principal component analysis. The phylogenetic signal for body shape was then calculated. To determine the relations in morphological similarity, a dendrogram was created using the unweighted pair group method and arithmetic mean values, while a Procrustes ANOVA and post-hoc test were used to evaluate significant differences between species and habitats. We found three morphological groups that differed in body length and depth, head size, and the position of the mouth and eyes. The body shape analysis recovered the morphotypes of seven species, and statistical differences were demonstrated in eight species. Based on traits associated with cranial morphology, Wajpamheros nourissati (Allgayer, 1989) differed the most among the species examined. No phylogenetic signal was found for body shape; this trait shows independence from ancestral relatedness, indicating that there is little congruence between morphological and genetic interspecific patterns. As evidenced by the consistently convergent morphology of the species in the Theraps–Paraneetroplus clade, the diversification of the group is related to an ecological opportunity for habitat use and the exploitation of food resources. Although no phylogenetic signal was detected for body shape, there appears to be an order associated with cranial morphology-based phylogeny. However, it is important to evaluate the intraspecific morphologic plasticity produced by ecological segregation or partitioning of resources. Therefore, future morphological evolutionary studies should consider cranial structures related to the capture and processing of food.

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Research Article Wed, 22 Dec 2021 07:43:49 +0200
A new record of a rare labrid, Suezichthys notatus (Actinopterygii: Labridae), from Taiwan, with comparison to related species from Taiwan https://aiep.pensoft.net/article/64061/ Acta Ichthyologica et Piscatoria 51(4): 393-401

DOI: 10.3897/aiep.51.64061

Authors: Chi-Ngai Tang, Hong-Ming Chen, Husan-Ching Ho

Abstract: Three specimens of a rare labrid, Suezichthys notatus (Kamohara, 1958) were recently collected from local markets, which were captured from deep-water off northern and southwestern Taiwan, and represent a new record for Taiwan. Suezichthys notatus can be distinguished from its congeners by a combination of characters: scale rows above lateral line 2½; low scaly sheath present at base of dorsal and anal fins; dorsal-fin element IX, 11; anal-fin elements III, 10; lateral line scales 25‒26, each with simple, unbranched laterosensory canal tube; cheek scale rows behind and below eye 2 and 2‒3 respectively; a group of prominent dark blotches extending from the interorbital region dorsoposteriorly; body depth at dorsal-fin origin 3.7‒3.9 in standard length; short pelvic fin without filamentous extension, 2.2‒2.5 in head length. Suezichthys resembles the labrid genus Pseudolabrus, comparison of Taiwanese species of Suezichthys with those of Pseudolabrus are given.

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Research Article Mon, 6 Dec 2021 10:38:35 +0200
A southward range extension of a wreckfish, Stereolepis doederleini (Actinopterygii: Acropomatiformes: Polyprionidae), to tropical water off eastern Taiwan https://aiep.pensoft.net/article/73207/ Acta Ichthyologica et Piscatoria 51(4): 365-370

DOI: 10.3897/aiep.51.e73207

Authors: Hsuan-Ching Ho, Chi-Ngai Tang, Chiu-Min Cheng

Abstract: A wreckfish, Stereolepis doederleini Lindberg et Krasyukova, 1969, inhabits typical cold or temperate waters and was previously known from Great Bay (Sea of Japan), Korea, south to Kyuhu-Palau Ridge of Japan. In the present report, a specimen of this fish was collected from southeastern Taiwan representing the southernmost distribution of the cold-water genus Stereolepis in the Northern Hemisphere, with a southward extension into the tropical region. It is also the first record of a member of the family Polyprionidae from Taiwan. Here we document the species found in Taiwan, with a detailed description of the specimen.

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Research Article Mon, 22 Nov 2021 11:13:42 +0200
Population characteristics of the non-indigenous round goby, Neogobius melanostomus (Actinopterygii: Perciformes: Gobiidae), in the eastern Gulf of Finland https://aiep.pensoft.net/article/68601/ Acta Ichthyologica et Piscatoria 51(3): 327-337

DOI: 10.3897/aiep.51.68601

Authors: Anton Uspenskiy, Anastasia Yurtseva, Dmitry Bogdanov

Abstract: The round goby, Neogobius melanostomus (Pallas, 1814), is a fish of Ponto-Caspian origin that has been invading the Baltic Sea since the 1990s. Currently, it is abundant and commercially important in some areas of the sea. This species was first reported in the eastern Gulf of Finland (GoF) in 2012. Its occurrence increased thereafter, however it has remained largely unstudied in this region. The aim of this study was to investigate the population characteristics of the round goby in the eastern GoF to better understand its expansion trend and whether it will become abundant enough to be exploited by the local fishery. Fish were caught using multi-mesh gillnets (12–60 mm mesh) and a beach seine (0.5–10 mm mesh). Occurrence, density, catch per unit effort, biomass per unit effort, relative number and biomass in catches, as well as age, size and sex ratio were studied. The species regularly occurred in samplings along the southern coastline of the GoF, as well as some central areas and along the northern coast. Within 2012–2019, its occurrence in catches increased, with the highest frequency in 2015–2019 in shallow waters (<1.5 m) of Koporye Bay (70%) and in the deeper waters of Narva Bay (74%). Similarly, the highest density in the shallow waters was also observed in Koporye Bay (10.0 ind. ∙ 100 m−2), and offshore in Narva Bay. Relative abundance and biomass usually did not exceed 23%, although it reached 93% in Narva Bay. The oldest specimen was five years old. Young-of-the-year (YOY) juveniles predominated in the shallow waters (85%), while three-year-olds prevailed in deeper waters (75%). Among the fish older than two years, females were more predominant (mean ratio 3 to 1), and males were larger than females. Specimens in all life stages were found in the eastern GoF, and their abundance increased annually, suggesting that the round goby has successfully colonized this region of the Baltic Sea. However, compared to other areas of the Baltic Sea inhabited by longer-established populations, its population size is still relatively low.

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Research Article Mon, 13 Sep 2021 11:42:18 +0300
Length–weight analysis of ten species (Actinopterygii) supporting subsistence fishery in Lakshadweep waters, southern Arabian Sea https://aiep.pensoft.net/article/64632/ Acta Ichthyologica et Piscatoria 51(3): 257-261

DOI: 10.3897/aiep.51.64632

Authors: Pentam Veli Pura Shahul Hameed, Aliyyathumada Ishyyapura Muhsin, Pathummathada Pookoya, Kutty Ranjeet

Abstract: The length–weight relations of ten fish species representing eight genera and four families and that formed the backbone of the subsistence fishery in the Lakshadweep islands were estimated. These fishes which included four species of tuna [Katsuwonus pelamis (Linnaeus, 1758); Thunnus albacares (Bonnaterre, 1788); Auxis thazard (Lacepède, 1800); Euthynnus affinis (Cantor, 1849)], three species of needlefishes[Ablennes hians (Valenciennes, 1846); Tylosurus crocodilus (Péron et Leseur, 1821); Tylosurus acus melanotus (Bleeker, 1850)], two species of bait fishes [Spratelloides delicatulus (Bennett, 1832); Spratelloides gracilis (Temminck et Schlegel, 1846)], and one species of halfbeak (Hemiramphus archipelagicus Collette et Parin, 1978) contributed to 96% of the total fish landings. The samples were collected from fish landing centers of ten inhabited islands of Lakshadweep from 2015 to 2017. Katsuwonus pelamis showed isometric growth, S. delicatulus and S. gracilis exhibited positive allometry, while negative allometric growth was seen in other species. The coefficient a of the LWR ranged from 0.001 (A. hians) to 0.035 (T. albacares), while b ranged from 2.7 (T. acus melanotus) to 3.4 (S. delicatulus). The results of the presently reported study provide useful biological information on the stock of ten commercially important pelagic fish species supporting the traditional fisheries in Lakshadweep waters.

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Short Communication Thu, 9 Sep 2021 10:37:22 +0300
Genetic diversity of the yellowfin seabream, Acanthopagrus latus (Actinopterygii: Perciformes: Sparidae)—An enhancement species in Dongshan Bay https://aiep.pensoft.net/article/66894/ Acta Ichthyologica et Piscatoria 51(3): 281-287

DOI: 10.3897/aiep.51.66894

Authors: Cheng Liu, Jing Zhang, Shigang Liu, Puqing Song, Ying Guan, Binbin Shan, Yuan Li, Longshan Lin

Abstract: Dongshan Bay is located on the west side of the Taiwan Strait, which had abundant fishery resources in the past. With the increase in fishing pressure, resources have declined. To restore the fishery resources in Dongshan Bay and to increase fishing yield, much enhancement and release work has been carried out in Dongshan Bay. The yellowfin seabream, Acanthopagrus latus (Houttuyn, 1782), is an important enhancement species in Dongshan Bay that is also frequently captured. Due to yearly progress in enhancement and release, it is necessary to study the current status of the genetic diversity of yellowfin seabream in Dongshan Bay. The results show that all yellowfin seabream populations have high genetic diversity, which is mainly related to its breeding habits and growth rate, and this ensures a large recruitment stock in the natural seas. The current population has differentiated from the historical population due to a change in genetic structure, and many historical haplotypes have been lost. The results of this study provide a reference for fishery management departments to formulate management measures and conservation policies specifically for yellowfin seabream. In particular, yellowfin seabream is a hermaphroditic and protandrous species. Targeting an older age group as the main fishing subject is not conducive to its breeding protection and resource growth, and therefore, fishing of an older age group should be restricted in fishery production.

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Research Article Thu, 9 Sep 2021 09:50:24 +0300
Temporal stability in the otolith Sr:Ca ratio of the yellow croaker, Larimichthys polyactis (Actinopterygii, Perciformes, Sciaenidae), from the southern Yellow Sea https://aiep.pensoft.net/article/63245/ Acta Ichthyologica et Piscatoria 51(1): 59-65

DOI: 10.3897/aiep.51.63245

Authors: Ying Xiong, Jian Yang, Tao Jiang, Hongbo Liu, Xiaming Zhong

Abstract: Otolith chemical signatures are sufficiently stable across time to allow for accurate stock classification. The classification of the southern Yellow Sea population for Larimichthys polyactis (Bleeker, 1877) and its connectivity with others from 1962 is controversial. The study aimed to study the inter-annual variation in otolith strontium:calcium (Sr:Ca) ratios of L. polyactis to determine whether otolith natural tags are representative over long periods and can then be used for population structure classification. Spawning L. polyactis individuals were captured by stow nets in the same site of the southern Yellow Sea coastal waters during April–May in 2003, 2012, and 2013. EPMA (electron probe microanalysis) was used to determine the Sr:Ca ratios of a total of 25 otolith samples. Mann–Whitney U-test was used to test the differences of otolith Sr:Ca ratios from the core to edge for each otolith. One-way ANOVA was performed to compare the mean otolith Sr:Ca values among 2003, 2012, and 2013. Otoliths from 2003, 2012, and 2013 showed similar patterns of Sr:Ca ratios and Sr:Ca ratios could be divided into higher and lower phases in the core and remaining regions, respectively. Inter-annual significant differences for each high or low Sr:Ca phase of otoliths were not observed over short- (between 2012 and 2013) or long-time (between 2003 and 2012, and between 2003 and 2013) scales. Univariate contrasts across the adjacent year and decade classes were statistically similar. The Sr:Ca ratio signatures in the otolith were relatively stable across years and can be used as a reliable natural tag for connectivity assessments and stock identification with little or no genetic differentiation among L. polyactis populations. The short- and long-term temporal stability of otolith Sr:Ca ratios also revealed, the existence of stable L. polyactis stocks in the southern Yellow Sea, consistent with a previous finding of capture survey.

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Research Article Wed, 31 Mar 2021 21:29:08 +0300