Length‐weight relationships of three fish species from the lower Brahmaputra drainage in Assam,India

Length‐Weight relationships (LWRs) for three Cyprinids (Chela cachius, Devario devario and Securicula gora) collected seasonally from May 2016 to January 2017 along the lower Brahmaputra drainage in Assam (Northeast India), using fishing gears [cast nets: 2.5 m, 10–15 mm mesh size; gillnets: 30 × 0.9 m, 18–20 mm mesh size], were estimated. The ‘b’ values of the LWR estimates ranged from 3.39 for C.  cachius, 3.14 for D.  devario, and 2.97 for S.  gora respectively.     

Length‐weight relationships of five fish species collected from Ranganadi River (Brahmaputra River tributary) in Assam,India

Length‐weight relationships (LWR) are presented for five fish species: Laubuka laubuca (Hamilton, 1822); Aspidoparia jaya (Hamilton, 1822); Channa gachua (Hamilton, 1822); Acanthocobitis botia (Hamilton, 1822) and Badis badis (Hamilton, 1822) collected from the Ranganadi River in the Lakhimpur district of Assam, India. There were no prior LWR data regarding three of these species.     

Length–weight relationships of four indigenous fish species from Brahmaputra River,Assam, India

The present study was undertaken with the objective to estimate the length‐weight Relationships (LWRs) for four species collected from the Brahmaputra River, Assam, India. The fish samples were collected quarterly from different sampling sites using gill net (mesh size ranges 1–1.5 cm, locally called Mola lungi jal), cast net (mesh size ranges 1.0–2.0 cm, locally called Kevalijal) and triangular dip nets (mesh size ranges 0.75–1.25 cm locally called khorajal) during the time period between May, 2016 to April, 2018 (2 years). The b value of the LWR ranged from 3.028 (for Parambasis lala) to 3.196 (for Psilorynchus balitora). In this study the relationship between length‐weight were highly correlated (p < 0.05).     

Length‐weight relationships (LWRs) of four freshwater fish species from the Brahmaputra and Barak river basins,northeast India

The present study describes the length‐weight relationships (LWRs) were determined for four fish species, collected from the Brahmaputra and Barak river basins in northeast India using cast nets (2.5 × 1 m; 10–15 mm mesh size) and gillnets (30 × 0.9 m; 5–10 mm mesh size), from June 2016 to July 2017. The b values in LWRs were determined as 2.70 for Badis tuivaiei Vishwanath & Shanta, 2004, 2.93 for Canthophrys gongota (Hamilton, 1822), 2.62 for Glyptothorax botius (Hamilton, 1822), and 3.22 for Gogangra viridescens (Hamilton, 1822).     

Length‐weight relationships of three fish species from Nujiang River of China

The length‐weight relationships were determined for three fish species [Glyptothorax dorsalis Vinciguerra, 1890, Glyptothorax zanaensis Wu, He & Chu, 1981, and Percocypris tchangi (Pellegrin & Chevey, 1936)]. All fish were collected using drift gillnet (stretched mesh size: 4 cm) and castnet (mesh size: 1 cm) from Gongshan mountain, China. Samples were collected quarterly from July 2014 to August 2016. The parameter b of length‐weight relationship varied from 2.51 for Glyptothorax dorsalis to 3.30 for Percocypris tchangi. And the new standard length recorded for Glyptothorax dorsalis and Percocypris tchangi.     

Length–weight relationships of five fish species collected from Basistha River,a torrential river in Assam,India

Length–weight relationships (LWRs) are presented for five species, namely: Garra nasuta (McClelland, 1838); Garra gotyla gotyla (Gray, 1830); Devario aequipinnatus (McClelland, 1839); Barilius bendelisis (Hamilton, 1807) and Pseudolaguvia shawi (Hora, 1921) collected from the Basistha River, Guwahati, Assam, India. Information regarding LWR data for four of these species was not yet available in FishBase (Version 04/2015; Froese and Pauly, 2015).     

Length‐weight relationships of three indigenous fishes collected from Ranganadi River of Lakhimpur district,Assam, India

Length‐weight relationships (LWR) were estimated for three species of fishes, namely Amblyceps arunchalensis, Nath & Dey, 1989, Botia rostrata Günther, 1868, and Esomus danrica (Hamilton, 1822) inhabiting the Ranganadi river in Lakhimpur district of Assam, India. A total of 400 specimens (A. arunchalensis – 33, B. rostrata‐ 53, and Esomus danrica – 314) were collected during irregular intervals between January 2013 and December 2015 using a cast net of 2–10 mm mesh sizes and 2–2.5 m length. The length–weight parameter b ranged from a minimum of 2.95 for E. danrica to a maximum of 3.14 for B. rostrata, with regression coefficients (r²) ranging from0.966 to .993. Prior to this study, the LWRs for B. rostrata E. danrica and A. arunchalensis were unknown. A new maximum length is reported for A. arunchalensis.     

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 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 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 three estuarine fish species from Bangladesh

The length‐weight relationships (LWRs) of three fish species; Toxotes chatareus (Hamilton, 1822), Datnioides polota (Hamilton, 1822), and Chela cachius (Hamilton, 1822) collected between September 2016 and August 2017 from Tentulia estuary of Bangladesh were analyzed. Fish were caught seasonally using set bag net and cast net with mesh size of 0.5 cm and < 0.5 cm, respectively. LWRs of Toxotes chatareus, Datnioides polota and Chela cachius were calculated as W = 0.0154L^2.926 (r² = .962), W = 0.0149L^3.106 (r² = .992) and W = 0.0109L^2.968 (r² = .981), respectively. The study provides a new maximum total length for Chela cachius.     

Length–weight relationships of three fish species from the Tajan River,Iran

The study describes the length–weight relationships for two Cobitid species, namely Cobitis keyvani and Sabanejewia aurata, plus a Gobiid species, Ponticola gorlap, all from the Tajan River in Mazandaran province, Iran.     

Length‐weight relationships of four fish species from Visakhapatnam coast,India

Length‐weight relationships (LWRs) were determined for 4 deep water fish species from Visakhapatnam coast, India. Specimens were collected fortnightly between December 2013 and November 2015 from commercial trawls at Visakhapatnam fish landing centre (16.98°N–20.2°N, Long.82.19°–86.53°E). Individuals were captured between 100 and 300 m depth with shrimp trawl net (head rope length: 37–46 m and cod end mesh size: 30–40 mm). Total length (TL) (nearest to 0.1 cm) and body weights (nearest to 0.1 g) were taken each individual. All LWRs were significant with r² values ranged from 0.958 for Uranoscopus bicinctus Temminkc & Schlegel, 1843 to 0.983 for Uranoscopus chinensis Guichenot, 1882 and “b” values ranged from 2.832 for U. bicinctus to 3. 402 Synodus indicus (Day, 1873).This study provides a new maximum length data for three species (Uranoscopus bicinctus Temminkc & Schlegel, 1843; Uranoscopus chinensis Guichenot, 1882 and Uranoscopus marmoratus Cuvier, 1829).     

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 for eight fish species from the Ravi River,north‐western India

Length–weight relationships (LWRs) were evaluated for Badis badis (n = 25), Sperata seenghala (n = 26), Labeo gonius (n = 34), Rasbora rasbora (n = 30), Bagarius bagarius (n = 24), Gagata cenia (n = 27), Glyptothorax stoliczkae (n = 24) and Channa orientalis (n = 28) from the Ravi River tributary in North India. Altogether 218 samples of eight species were obtained between May and November 2014 using cast nets and gill nets. LWRs for these species were unknown to FishBase, and new maximum lengths were recorded for two of these species.     

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 three fish species from the Jinsha River,southwestern China

Length–weight relationships were determined for the first time for three fish species (Xenocypris fangi Tchang, 1930; Microphysogobio kiatingensis Wu, 1930; and Opsariichthys bidens Günther, 1873) from the Jinsha River, southwestern China. Samples were collected using gillnets (30 × 15 m, mesh‐size 5 mm) and electroshock fishing techniques (CWB‐2000 P, 12 V, 250 Hz ).     

Length‐weight relationships of three cyprinid fish species from southwestern China

Length–weight relationships (LWRs) were determined for three cyprinid fish species [Acrossocheilus yunnanensis (Regan, 1904), Onychostoma simum (Sauvage & Dabry de Thiersant, 1874) and Spinibarbus sinensis (Bleeker, 1871)] from southwestern China. Samples were obtained with various fishing gear (set nets, drift gill nets, fish cages, hook and electrofishing). Prior to this study, the LWRs for these three species (A. yunnanensis, O. simum and S. sinensis) were unknown.     

Length‐weight relationships of four fish species from the Yellow River,China

Length‐weight relationships (LWRs) were estimated for four fish species [Schizopygopsis anteroventris Wu & Tsao, 1989, Schizothorax lissolabiatus Tsao, 1964, Triplophysa markehenensis (Zhu & Wu, 1981) and Triplophysa siluroides (Herzenstein, 1888)] from the Yellow River. Samples were collected seasonally from August 2016 to October 2017, using various fishing gears [set nets (mesh: 1.5 cm × 2.0 cm), hook, drift gill nets (mesh: 1.0 cm × 2.0 cm × 3.0 cm) and electro fishing]. Four new maximum standard length were recorded for S. anteroventris, S. lissolabiatus, T. markehenensis and T. siluroides.     

Length‐weight relationships of 77 fish species from the Chishui River,China

Length‐weight relationships are described for 77 fish species belonging to eight families and 56 genera from the Chishui River, a protected tributary of the upper Yangtze River, China. Length–weight relationships for 56 species were unknown to FishBase and new maximum lengths are recorded for 44 species. These results will be useful for fishery research, management and conservation in the upper Yangtze River Basin.