Length‐weight relationships for nine fish species of Laohegou River,a tributary of upper Yangtze River,China

This paper provides length‐weight relationships for nine fish species from the Laohegou River, a tributary of the upper Yangtze River. Length‐weight relationships for six of these species are recorded for the first time. New maximum lengths for two species are also reported.     

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 nine fish species from the Tetulia River,southern Bangladesh

The present study describes the length‐weight relationships (LWRs) for nine fish species from the Tetulia River, southern Bangladesh, namely Anabas testudineus, Coilia dussumieri, Otolithoides biauritus, Otolithoides pama, Pethia conchonius, Polynemus paradiseus, Puntius lateristriga, Setipinna taty and Sillaginopsis panijus. A total of 1380 specimens were caught using traditional fishing gear from March 2012 to February 2013. Individual total length (TL) and body weight (BW) were measured by digital slide calipers and digital balance, respectively. The LWR was calculated as W= a L^b, where the W is the BW in g and L the TL in cm, a and b are regression parameters. This study presents the very first references on LWRs for seven of the species. The results are valuable for the application of sustainable management and conservation of these fishes in the Tetulia River and surrounding ecosystems.     

Length–weight relationships for five endemic fish species in the upper Yangtze River basin,China

Length – weight relationships were estimated for five endemic fish species in the upper Yangtze River: Platysmacheilus nudiventris Luo, Le & Chen, 1977, Xenophysogobio nudicorpa (Huang & Zhang, 1986), Homatula potanini (Günther, 1896), Leptobotia rubrilabris (Dabry de Thiersant, 1872), and Euchiloglanis kishinouyei Kimura, 1934. The a values ranged from 0.0079 to 0.0134, and b values from 2.833 to 3.081. These five endemic species are rare, small and difficult to find and capture. Thus the sampling period was lengthy, from May 2010 to May 2014. A total of 718 specimens were available for analysis, and the length – weight relationships are the first reports for these five endemic fish species.     

Length–weight relationships of nine freshwater fish species from the Liujiang River,Guangxi, China

Studied were the length–weight relationships (LWRs) of 599 fish specimens covering four families, nine genera and nine species (Sinibrama macrops, Acrossocheilus parallens, Microphysogobio fukiensis, Squalidus wolterstorffi, Pseudohemiculter dispar, Tachysurus fulvidraco, Hemibagrus macropterus, Pseudobagrus crassilabris and Siniperca kneri) collected in the Liujiang River, a tributary of the Pearl River, in March 2014, September 2014 and March 2015. The b value varied between 2.385 (P. crassilabris) and 3.178 (P. dispar), with the mean b = 2.85 at P < 0.001 for all nine species.     

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.     

Length‐weight relationships of seven fish species from Jequitinhonha River basin,southeastern Brazil

The present study established the length‐weight relationships (LWR) for seven fish species from Jequitinhonha River basin, a Brazilian coastal drainage, collected with gillnets (3 to 16 cm) between 2011 and 2016. For the LWR, standard length and total weight were used. The allometric coefficient b varied from 2.66 to 3.26. These results provide biological data for a region of extreme biogeographical importance that is suffering serious environmental disturbances.     

Length‐weight relationships of nine fish species from the upper reach of the Gan River,a tributary of the Yangtze River in China

Length‐weight relationships (LWRs) are reported for nine fish species belonging to four families from the upper reach of the Gan River, one of the main tributaries of the Yangtze River, China. A total of 807 specimens were collected from April 2016 to July 2017. Fishes were both sampled using a backpack electrofishing unit and collected from local fish markets that using various fishing gears such as electrofishing boats, gillnets (mesh sizes: 1–12 cm), hooks, and benthic fyke nets (mesh sizes: 0.5 cm and 0.7 cm). The fish species were Siniperca undulata (Fang & Chong, 1932), Pseudogobio vaillanti (Sauvage, 1878), Sarcocheilichthys parvus (Nichols, 1930), Barbodes semifasciolatus (Günther, 1868), Spinibarbus hollandi (Oshima, 1919), Gobiobotia meridionalis (Chen & Cao, 1977), Pseudobagrus albomarginatus (Rendahl, 1928), Pseudogastromyzon changtingensis (Liang, 1942), and Pseudogastromyzon fangi (Nichols, 1931). The a values for the nine species varied between 0.0056 and 0.0366, the b values ranged from 2.333 to 3.318, and r² values from .952 to .994.     

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

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

Length‐weight relationships of five fish species from the Daninghe River,China

Length‐weight relationships were described for five fish species belonging to three families and four genera from the Daninghe River, one of primary tributaries of the upper Yangtze River, China. A total of 1894 specimens were collected from 2014 to 2016 by using electro‐fishing equipment. Length–weight relationships for five species were recorded previously in FishBase and new maximum total lengths for five species were also presented in this paper. The results will be useful for fishery research, management and conservation in the upper Yangtze River Basin.     

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 nine fish species from the Tongjiang section of the Songhua River,China

Length–weight relationships were evaluated for nine fish species from the Tongjiang section of the Songhua River in China. A total of 675 fish specimens were collected from 4 May to 29 October 2014. Length–weight relationships for six fish species (Romanogobio tenuicorpus, Leuciscus waleckii, Opsariichthys bidens, Microphysogobio amurensis, Pelteobagrus ussuriensis and Misgurnus mohoity) were new to FishBase in 2015, but the length–weight relationships of P. ussuriensis was studied by Ma in 2015. New data on M. mohoity is offered, and this study also shows new maximum total lengths for three fish species. The r² values ranged from .95 to .99. Values of b varied from 2.504 to 3.471.     

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 11 fish species from the upper Jinsha River,China

Length‐weight relationships (LWR) are described for eleven indigenous fishes from the upper Jinsha River, which is the upper stretch of the Yangtze River, China. This is the first record of length‐weight relationships for ten of these species in FishBase and new maximum lengths are recorded for seven species.     

Length‐weight relationships for three endemic fish species from the upper reaches of the Yangtze River,southwestern China

Length‐weight relationships (LWRs) were evaluated for three endemic fish species (Sinibrama taeniatus Nichols, 1941; Ancherythroculter nigrocauda Yin & Wu, 1964; and Acrossocheilus monticola Günther, 1888) from the upper reaches of the Yangtze River, southwestern China. Samples were collected using gill nets (25 × 12 m, mesh‐size 2.0 cm) and fishing cages (0.5 × 0.5 × 10 m, mesh‐size 1.0 cm) as well as by electroshock (CWB‐2000 P, 12 V, 250 Hz), from July to September in 2013–2016. Prior to this study, the LWRs for these three species (S. taeniatus, A. nigrocauda and A. monticola) were unknown. In addition, new maximum size for A. nigrocauda and A. monticola were provided.     

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

Length–weight relationships were determined for two fish species (Jinshaia sinensis Sauvage & Dabry de Thiersant, 1874; and Zacco platypus Temminck & Schlegel, 1846) collected from the upper reaches of the Yangtze River in China. The length–weight relationships were determined for the first time.     

Length–weight relationships for five fish species from the middle reaches of the Yangtze River,China

Length–weight relationships (LWRs) for five fish species which were captured by trap‐nets and gillnets (major mesh size: 1–10 cm) from the middle Yangtze River, China (29°47′ – 29°26′N; 112°51′ – 113°08′E) were determined in September 2017. These were Acheilognathus hypselonotus (Bleeker, 1871), Culter oxycephaloides Kreyenberg & Pappenheim, 1908, Distoechodon tumirostris Peters, 1881, Sarcocheilichthys nigripinnis (Günther, 1873) and Micropercops swinhonis (Günther, 1873). The LWRs were estimated using the logarithmic form of the formula W  =  a  ×  L^b. The b value ranged from 2.879 for A. hypselonotus to 3.285 for M. swinhonis. LWRs for four fish species and new maximum lengths for three species are presented to FishBase for the first time.     

Length‐weight relationships of 23 fish species from the Ergis River in Xingjiang,China

In this study the length–weight relationships of 23 fish species belonging to eight families and 21 genera from the Ergis River in China were analyzed. A total of 1869 specimens were used to estimate the relationship parameters. Seven of these fish species and one maximum length are new to science against FishBase. The r² value ranged from 0.975 to 0.999. Values of b varied from 2.630 to 3.494.