Length–weight relationships of seven fish species from the Yuan River,China

Length–weight relationships were determined for seven fish species (Culter oxycephaloides Kreyenberg & Pappenheim, 1908; Pseudobagrus tenuis Günther, 1873; Saurogobio dumerili Bleeker, 1871; Distoechodon tumirostris Peters, 1881; Pseudolaubuca engraulis Nichols, 1925; Liobagrus marginatoides Wu, 1930; and Parabotia bimaculata Chen, 1980) inhabiting the Yuan River, central China. Fishes were collected using gillnets and electroshock fishing techniques quarterly from January 2008 to December 2010. This study is first report the length–weight relationships for this seven fish species.     

Length–weight relationships of thirty‐seven fish species from the Hongshui River,Southwest China

Length‐weight relationships (LWR) were estimated for 37 fish species belonging to ten families from the middle and lower stream of the Hongshui River, one of the main tributaries to the Pearl River, Southwest China. Length‐weight relationships for 26 species are unknown to FishBase and new maximum lengths are recorded for 20 species. These results are useful for fishery research, conservation and management in the Hongshui River.     

Length–weight relationships for three fish species from Yalong River in China

This study provides the first report of length–weight relationships (LWRs) for three fish species collected from the Yalong River, one of the tributaries to the upper reaches of the Yangtze River, China. The LWRs of these fish species were BW = 0.0070TL^3.0539 (r² = 0.9662) for Schizothorax wangchiachii, BW=0.0134TL^2.8523 (r² = 0.9676) for Schizopygopsis malacanthus, and BW=0.0143TL^2.9253 (r² = 0.8538) for Euchiloglanis kishinouyei, respectively. Also investigated were the spawning season, absolute fecundity and main food items of the three fish species in the natural environment. In addition, new maximum sizes for the three species are provided.     

Length‐weight relationships of seven fish species from the Wutong River,northeast China

Length‐weight relationships (LWR) were calculated for seven fish species from the Wutong River, northeast China(47°58'‐47°10'N; 130°07'‐130°48'E), including Ladislavia taczanowskii Dybowski, 1869; Gobio cynocephalus Dybowski, 1869; Rhynchocypris lagowskii (Dybowski, 1869); Lefua costate (Kessler, 1876); Cobitis lutheri Rendahl, 1935; Cobitis sibirica Gladkov, 1935; Perccottus glenii Dybowski, 1877. All fish specimens were collected by electric fishing gear (voltage, 12 V) and gillnets (mesh size: 1.1 cm × 1.1 cm, 1.4 cm × 1.4 cm, 1.8 cm × 1.8 cm, 2.5 cm × 2.5 cm) from May to July 2017. The a values ranged from 0.0038 (Cobitis lutheri) to 0.0084 (Lefua costata), and b values from 2.716 (Lefua costata) to 3.450 (Perccottus glenii) and r² values from 0.973 (Cobitis lutheri) to 0.995 (ladislavia taczanowskii). This study provides the first published the LWRs for the five species, and new maximum total lengths were recorded for two species, including Gobio cynocephalus and Lefua costata.     

Length–weight relationships of three fish species from Wujiang River,China

Length–weight relationships were determined for three fish species (Pseudogyrinocheilus prochilus Sauvage & Dabry de Thiersant, 1874; Folifer brevifilis Peters, 1881; and Garra imberba Garman, 1912). Samples were collected from the Wujiang River in China, from May to July in 2009–2011 using gillnets (25 × 12 m, mesh size 0.5 cm) and fish cages (0.5 × 0.5 × 10 m, mesh size 0.5 cm mesh). Length–weight relationships for these three fish species were determined for the first time.     

Length–weight relationships of three fish species from Moyangjiang River,China

Length‐weight relationships were determined for three fish species [Tachysurus argentivittatus (Regan, 1905); Rhodeus spinalis Oshima, 1926; Liniparhomaloptera disparis (Lin, 1934)]. All fish sample were collected using gillnets (15 × 5 m, mesh‐size 5 mm) from Moyangjiang River, China. Samples were collected quarterly from July 2006 to August 2007. The parameter b of length‐weight relationship varied from 2.52 for Rhodeus spinalis to 3.27 forLiniparhomaloptera disparis.     

Length–weight and length–length relationships for seven fish species from the Zohreh River,Iran

Length–weight and length–length parameters were calculated for seven fish species belonging to five families in the Zohreh River, Iran. The weight–length relationships were estimated using the equation W = aL^b. The b values varied between 2.72 and 3.33, with a mean ± SD of 2.88 ± 0.28. The b values parameter in the length–weight relationship equations were calculated as 3.15 for Alburnus mossulensis Heckel, 1843; 3.78 for Barilius mesopotamicus Berg, 1932; 2.86 for Cyprinion macrostomum Heckel, 1843; 2.89 for Nuchequula gerreoides (Bleeker, 1851); 2.80 for Mastacembelus mastacembelus (Banks & Solander, 1794); 2.72 for Liza abu (Heckel, 1843); and 3.19 for Paraschistura nielseni (Nalbant and Bianco, 1998). This study presents the first LWR and LLR references for these species in the Zohreh River.     

Length–weight relationships for eight fish species from the Pearl River Delta,China

Length–weight relationships (LWRs) were estimated for eight native fish species collected in the lower reaches of the Pearl River, Guangdong Province, South China. Fish were sampled in March and September 2014 and January 2015, using gillnets with various mesh sizes (5–8 cm) and trawl nets with a 3 cm mesh size. A total of 568 specimens of the eight species were analyzed. The r² values for these species ranged from 0.951 to 0.991. The b values ranged from 3.00 for Takifugu ocellatus and Moolgarda cunnesius, to 3.57 for Clupanodon thrissa. New maximum total lengths are recorded for Takifugu ocellatus (17.6 cm) and Liza carinata (24.4 cm). For five species (Clupanodon thrissa, Megalobrama terminalis, Collichthys lucidus, Coilia grayii, Takifugu ocellatus), the LWRs are presented to fishbase for the first time.     

Length–weight relationships of 13 fish species from the Lijiang River,China

The length–weight relationships (LWRs) of 13 species belong to three orders and four families from the Lijiang River, China. Samples were obtained between 2013 April and 2015 January using gillnets (25 × 12 m, mesh size 0.5 cm), trawl nets (50 × 12 m, mesh size 0.5 cm) and fishhooks (0.5 × 0.5 × 10 m, mesh size 0.5 cm mesh). Exponent b varied from 2.639 to 3.549 and r² values varied from .962 to .995.     

Length–weight relationships of four fish species from the Nujiang River,China

Length–weight relationships (LWRs) were determined for four fish species (Akrokolioplax bicornis [Wu, 1977], Barbodes wynaadensis [Day, 1873], Glyptothorax cavia [Hamilton, 1822] and Placocheilus cryptonemus [Cui & Li, 1984]) from the Nujiang River, China. Samples were collected from March 2008 to August 2016 (frequency of sampling during the study period: once per year), using various fishing gears (set nets [mesh: 1.5 cm × 2.0 cm], fish cages [0.5 cm mesh], hook, drift gill nets [mesh: 1.0 cm × 2.0 cm × 3.0 cm] and electro fishing). Two new maximum SL were recorded for B. wynaadensis and P. cryptonemus.     

Length–weight relationships for four endemic fish species from the Yalu River,China

Length–weight relationships (LWRs) are presented for four endemic fish species caught in the upper Yalu River during the yearly surveys (2017) by either electrofishing or fish cage net (5 mm mesh size) as soon as the ice melted. The parameter b ranged between 2.244 in Gobio macrocephalus and 3.428 in Ladislavia taczanowskii. Additionally, the parameter a ranged between 0.004 in Misgurnus bipartitus and 0.059 in Gobio macrocephalus. All length‐weight relationships were highly significant (r² ≥ 0.8754) on a log scale.     

Length–weight relationships for three fish species from the Yalong River,southwestern China

Length–weight relationships were determined for three fish species: Gymnodiptychus pachycheilus (Herzenstein, 1892), Discogobio yunnanensis (Regan, 1907), and Triplophysa pseudostenura (He, Zhang & Song, 2012). Samples were collected from the Yalong River, southwestern China using fishing gear (gillnets, 30 × 15 m, mesh‐size 5 mm) and electroshock fishing (CWB‐2000 P, 12 V, 250 HZ) in June 2007. Prior to this study, length–weight relationships for these three species were unknown. For two of the species [Discogobio yunnanensis (Regan, 1907) and Triplophysa pseudostenura (He, Zhang & Song, 2012)], new maximum standard lengths not yet reported in the scientific literature were noted.     

Length‐weight relationships of three freshwater fish species from the Nandu River and Changhua River in Hainan Island,China

Length‐weight relationships (LRWs) were determined for three fish species from the Hainan Island, China. Fish specimens were sampled across the Nandu River and Changhua River from May 2017 to June 2018 with benthic fyke‐nets (stretched mesh size: 0.4 cm), multi‐mesh gillnets (stretched mesh size ranging from 1.0 to 12.5 cm) and electrofishing. Relationships between length and weight were fitted very well for all species (all R²>0.95). The b values of the LRW equations ranging from 2.938 for Liniparhomaloptera qiongzhongensis to 3.259 for Toxabramis houdemeri.     

Length–weight relationships of three fish species from the Yangtze River,China

Length–weight relationships (LWRs) were determined for three endemic fish species [Gobiobotia filifer (Garman, 1912), Homatula potanini (Günther, 1896) and Xenophysogobio boulengeri (Tchang, 1929)] from the Yangtze River in China. Samples were obtained between April 2008 and June 2012 using various types of fishing gear and electroshock fishing techniques. For each species, the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Prior to this study, the LWRs for two species [Gobiobotia filifer (Garman, 1912) and Homatula potanini (Günther, 1896)] were unknown.     

Length–weight relationships of two fish species from the Yangtze River,China

Fish samples for the study were collected from the Yangtze River in China. Length–weight relationships were determined for two endemic fish species (Leiocassis longirostris Günther, 1864 and Schistura fasciolata Nichols & Pope, 1927) for the first time.     

Length–weight relationships of three fish species from the Yalong River,China

Length–weight relationships (LWRs) were determined for three fish species (Gymnodiptychus pachycheilus (Herzenstein, 1892), Triplophysa bleekeri (Sauvage & Dabry de Thiersant, 1874) and Triplophysa pseudostenura (He, Zhang & Song, 2012)) from the Yalong River in China. Samples were obtained between March 2009 and July 2013 using gillnets (25 × 12 m, mesh size 0.5 cm) and fish cages (0.5 × 0.5 × 10 m, mesh size 0.5 cm mesh). For each species, the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Prior to this study, the LWRs for these three species were unknown.     

Length–weight relationships of five fish species from the Beijiang River,China

The length–weight relationships (LWRs) were determined for five fish species from the Beijiang River in China. Fishes were caught by gill nets (mesh sizes: 5, 7, 9 cm), and cage nets (mesh sizes: 0.5 cm) from April to September 2018. Length–weight relationships of four species were unknown to FishBase, and new records of maximum lengths are given for two species, one of which, Ancherythroculter lini, is endemic species of the Pearl River. All length–weight relationships were highly significant on a log scale with the coefficient of determination (r²) values ranged from 0.939 to 0.991. Values of b were within the expected range, varied from 2.935 for A. lini to 3.414 for Parasinilabeo assimilis.     

Length–weight relationships of 16 fish species from the Tarim River,China

This paper reports the length–weight relationships of 16 fish species belonging to three families and ten genera from the Tarim River in China. Length–weight relationships for ten fish species were unknown to Fishbase, and new maximum lengths are given for six species. The r² values ranged from 0.972 to 0.995. Values of b varied from 2.79 to 3.49.     

Length–weight relationships of four fish species from the Niulan River,China

This study provides the length–weight relationships (LWRs) for four fish species [Leptobotia rubrilabris (Dabry de Thiersant, 1872); Opsariichthys bidens Günther, 1873; Xenocypris yunnanensis Nichols, 1925; and Sinogastromyzon sichangensis Chang, 1944] collected from the Niulan River, China. Samples were obtained between April 2008 and June 2011 using various types of fishing gear [drift gill nets (mesh: 5 × 5 cm), hook and electro fishing]. A total of 136 specimens belonging to four fish species were analyzed. For each species the sample size, length range, weight range, LWR, 95% confidence intervals of a and b, and coefficient of correlation were determined. Prior to this study, the LWRs for S. sichangensis and X. yunnanensis were unknown. New maximum sizes for S. sichangensis and X. yunnanensis are also provided.     

Length–weight relationships of five fish species from the Hongshui River,China

The length–weight relationships (LWRs) of five Chinese endemic fish species caught by cast nets (mesh size 1 cm) and gillnets (mesh size 4 cm) in the Hongshui River in June and July 2011 and October to November 2012 were determined. These are the first LWRs records for the five little‐known species.