Short Communication |
Corresponding author: Zhiming Zhou ( zjhz-zzm@163.com ) Academic editor: Rodolfo Reyes
© 2022 Aiju Zhang, Wei Luo, Jun Wang, Yabin Hao, Shanshi Xiao, Zhiming Zhou.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Zhang A, Luo W, Wang J, Hao Y, Xiao S, Zhou Z (2022) Length-to-weight and length-to-length relations of 15 freshwater fish species (Actinopterygii: Cypriniformes) from the Oujiang River, China. Acta Ichthyologica et Piscatoria 52(1): 91-93. https://doi.org/10.3897/aiep.52.80322
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Length-to-weight and length-to-length relations were estimated for 15 freshwater fishes belonging to the order Cypriniformes from Yuxi power station to Kaitan reservoir dam trunk stream of the Oujiang River, Zhejiang Province, China. The following species were studied: Distoechodon tumirostris Peters, 1881, Xenocypris davidi Bleeker, 1871, Plagiognathops microlepis (Bleeker, 1871), Hemibarbus labeo (Pallas, 1776), Hemibarbus maculatus Bleeker, 1871, Chanodichthys erythropterus (Basilewsky, 1855), Culter alburnus Basilewsky, 1855, Chanodichthys dabryi (Bleeker, 1871), Opsariichthys bidens Günther, 1873, Zacco platypus (Temminck et Schlegel, 1846), Sinibrama macrops (Günther, 1868), Hemiculter leucisculus (Basilewsky, 1855), Pseudohemiculter hainanensis (Boulenger, 1900), Rhodeus sinensis Günther, 1868, and Squalidus argentatus (Sauvage et Dabry de Thiersant, 1874). The determination coefficients r2 of LWRs were all over 0.96, and the 15 values of parameter b were consistent with the predicted range of 2.5–3.5. The total length-to-standard length relations were also calculated with r2 ≥ 0.97. Our study provides new information on LWR for 1 species and LLRs for 8 species, as well as new maximum total length recorded for 4 species (i.e., Distoechodon tumirostris, Opsariichthys bidens, Pseudohemiculter hainanensis, and Rhodeus sinensis) in FishBase. This study is expected to provide a useful baseline for further studies of population parameters to improve management decisions on the Oujiang River.
growth coefficient, length-length relation, length-weight relation, Oujiang River
The Oujiang River (118°45′–121°00′E, 27°28′–28°48′N) is the second major river in Zhejiang Province, China, with a basin area of about 18 028 km2. Other than drinking, it also has power generation, flood control, irrigation, and tourism functions. The river had a history of rich fish resources with 111 species in the 1970s. However, fish stocks have continued to decline in recent decades due to overfishing, biological invasion, environmental damage, and hydroelectric dam construction (
Fish samples were collected from Yuxi power station to Kaitan reservoir dam trunk stream of the Oujiang River, Zhejiang Province, China (28°17′–28°27′N, 119°44′–119°53′E), which is a relatively complete structural unit with original ecological preservation of the river’s valley features. Sampling was conducted seasonally from the section between March and November 2019. Multipanel nylon gillnets ranging in size from 1 cm to 8 cm were deployed to collect the fish at 05:00–07:00 h. All fish caught were identified to species (
The LWRs for 15 species were calculated using the formula
W = aTLb
where W is the weight [g], TL is the total length [cm], a and b are the intercept and slope of the power equation, respectively. The formula was equipped with a simple linear regression model based on log-transformed data. The 95% confidence interval (CI) for parameters a and b and the coefficients of determination (r2) were also determined (
TL = a + bSL
where SL is the standard length and other measurements are defined as above. For species with r2 < 0.95, outliers were discarded and regression was recalculated. All statistical analyses were performed using SPSS 16.0 (SPSS, Inc., Chicago, IL, USA).
A total of 2627 individuals were examined. The descriptive statistics and the estimated LWR parameters are summarized in Table
Descriptive statistics and estimated parameters of LWR (W = aTLb) for 15 freshwater fish species sampled in the Oujiang River, southeast China.
Species | Total length [cm] | Total weight [g] | LWR parameters | |||||||
---|---|---|---|---|---|---|---|---|---|---|
N | Min | Max | Min | Max | a | 95% CL of a | b | 95% CL of b | r 2 | |
Distoechodon tumirostris A | 555 | 14.5 | 42.0 | 23.2 | 740.0 | 0.007 | 0.006–0.008 | 3.041 | 2.997–3.085 | 0.97 |
Xenocypris davidi | 184 | 7.5 | 39.7 | 4.0 | 491.0 | 0.011 | 0.010–0.015 | 2.884 | 2.816–2.952 | 0.97 |
Plagiognathops microlepis | 287 | 10.7 | 38.2 | 13.4 | 474.6 | 0.016 | 0.014–0.020 | 2.770 | 2.713–2.827 | 0.97 |
Hemibarbus labeo | 287 | 10.2 | 42.5 | 8.2 | 695.6 | 0.009 | 0.008–0.010 | 2.976 | 2.934–3.017 | 0.99 |
Hemibarbus maculatus | 19 | 6.3 | 29.5 | 2.0 | 241.3 | 0.015 | 0.008–0.029 | 2.877 | 2.635–3.119 | 0.97 |
Chanodichthys erythropterus | 30 | 14.6 | 26.2 | 22.3 | 152.7 | 0.005 | 0.003–0.010 | 3.096 | 2.903–3.289 | 0.97 |
Culter alburnus | 189 | 11.0 | 46.5 | 6.0 | 480.5 | 0.006 | 0.005–0.008 | 2.951 | 2.891–3.010 | 0.98 |
Chanodichthys dabryi | 76 | 11.5 | 31.6 | 7.2 | 209.0 | 0.002 | 0.002–0.003 | 3.286 | 3.194–3.378 | 0.99 |
Opsariichthys bidens | 30 | 9.2 | 21.2 | 6.4 | 105.5 | 0.003 | 0.002–0.006 | 3.402 | 3.194–3.609 | 0.98 |
Zacco platypus | 206 | 6.4 | 16.3 | 2.6 | 45.7 | 0.006 | 0.006–0.008 | 3.157 | 3.083–3.232 | 0.97 |
Sinibrama macrops | 399 | 7.1 | 22.5 | 3.8 | 119.1 | 0.003 | 0.003–0.004 | 3.354 | 3.292–3.417 | 0.97 |
Hemiculter leucisculus | 49 | 10.4 | 23.0 | 6.8 | 107.4 | 0.003 | 0.002–0.006 | 3.231 | 3.061–3.401 | 0.97 |
Pseudohemiculter hainanens i s | 98 | 10.3 | 26.3 | 6.0 | 126.2 | 0.003 | 0.002–0.004 | 3.267 | 3.177–3.357 | 0.98 |
Rhodeus sinensis A | 29 | 5.3 | 7.6 | 2.3 | 6.6 | 0.015 | 0.010–0.024 | 2.934 | 2.700–3.167 | 0.96 |
Squalidus argentatus | 189 | 6.0 | 14.0 | 1.3 | 25.2 | 0.003 | 0.003–0.004 | 3.412 | 3.319–3.504 | 0.97 |
Length–length relations (TL = a + bSL) of 15 freshwater fish species sampled in the Oujiang River Basin, southeast China.
Species | LWR parameters | ||
---|---|---|---|
a | b | r 2 | |
Distoechodon tumirostris | 1.137 | 1.976 | 0.98 |
Xenocypris davidi | 1.342 | –0.944 | 0.98 |
Plagiognathops microlepis | 1.219 | 0.208 | 0.99 |
Hemibarbus labeo | 1.118 | 1.973 | 0.98 |
Hemibarbus maculatus | 1.196 | 0.292 | 0.99 |
Chanodichthys erythropterus | 1.155 | 0.750 | 0.99 |
Culter alburnus | 1.163 | 1.529 | 0.98 |
Chanodichthys dabryi | 1.192 | 0.607 | 0.99 |
Opsariichthys bidens | 1.171 | 0.451 | 0.99 |
Zacco platypus | 1.227 | –0.009 | 0.99 |
Sinibrama macrops | 1.222 | 0.395 | 0.97 |
Hemiculter leucisculus | 1.223 | –0.131 | 0.99 |
Pseudohemiculter hainanensis | 1.211 | –0.073 | 0.99 |
Rhodeus sinensis | 1.186 | 0.373 | 0.97 |
Squalidus argentatus | 1.152 | 0.507 | 0.98 |
As a result, all LWR and LLR estimates were highly significant (P < 0.01), yielding r2 > 0.96. One new LWR for Distoechodon tumirostris was found in comparison with the FishBase database (
This study provides basic information on LWRs and LLRs for 15 fish species. The new LWR for D. tumirostris, new LLRs for 8 species, and the new maximum size recorded for 4 species highlight the scarcity of information on the biological aspects of these fishes. These LWRs and LLRs should assist fisheries scientists and managers to complement their further studies of population parameters to improve management decisions on the Oujiang River.
This study was supported by the Financial Project of the Department Agriculture and Rural Affairs of Zhejiang Province (Grant No. 2019CZZX001)
Table S1
Data type: Data of length and weight