Latest Articles from Acta Ichthyologica et Piscatoria Latest 2 Articles from Acta Ichthyologica et Piscatoria https://aiep.pensoft.net/ Thu, 28 Mar 2024 11:18:05 +0200 Pensoft FeedCreator https://aiep.pensoft.net/i/logo.jpg Latest Articles from Acta Ichthyologica et Piscatoria https://aiep.pensoft.net/ 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
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