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 and length–length relationships for eight fish species from the Jarrahi River,southwestern Iran

Length–weight and length–length relationships were estimated for eight fish species belonging to three families from the Jarrahi River in southwestern Iran. The study was performed between June 2009 and September 2011. Weight–length relationships were estimated using the logarithmic form of the equation W = aL^b. The b values varied between 2.96 and 3.61 and determined as 3.42 for Alburnus mossulensis Heckel, 1843; 3.33 for Alburnoides idignensis Bogutskaya and Coad, 2009; 2.85 for Barbus grypus Heckel, 1843; 3.61 for Barilius mesopotamicus Berg, 1932; 3.16 for Cyprinion kais (Heckel, 1843); 3.36 for Cyprinion macrostomum Heckel, 1843; 3.27 for Paraschistura nielseni (Nalbant and Bianco, 1998); and 2.96 for Glyptothorax silviae Coad, 1981. This study presents the first LWR and LLR references for these species in the Jarrahi River.     

Length–weight relationships for five fish species caught in Keban Dam Lake,Turkey

Length–weight relationships (LWR) are presented for five commercial freshwater fish species (Luciobarbus esocinus, Heckel, 1843; Capoeta trutta, Heckel, 1843; Barbus lacerta, Heckel, 1843; Luciobarbus mystaceus, Pallas, 1814 and Capoeta umbla, Heckel, 1843) collected from Keban Dam Lake located in eastern Anatolia, Turkey. Studied samples were obtained between July and December 2008 using commercial gill nets. For each species the sample size, length range, weight range, length‐weight relationships, 95% confidence intervals of a and b, coefficient of correlation and growth type are given. Values of b were between 2.915 (Luciobarbus esocinus) and 3.079 (Copoeta trutta) and r² values from 0.919 (Copoeta trutta) to 0.987 (Barbus lacerta) in the study. New maximum length and length–weight relationships are reported for Barbus lacerta and Luciobarbus mystaceus.     

Length–weight and length‐length relationships for four freshwater fish species from Gölbaşı Lake (Hatay), Turkey

Length–weight and length–length relationships are presented for four freshwater fish species [Liza abu (Heckel, 1843), Aphanius mento (Heckel, 1843), Oxynoemacheilus hamwii (Krupp & Schneider, 1991) and Chondrostoma kinzelbachi Krupp, 1985] captured in Gölba?? Lake, Hatay, Anatolia. No information regarding length–weight relationships was reported previously in FishBase for C. kinzelbachi, A. mento and O. hamwii. Specimens were obtained from January to May 2012 using electrofishing and cast nets. This study presents the first study on LWR data for C. kinzelbachi, A. mento and O. hamwii.     

Length–weight and length–length relationships for four fish species from Talkhehrud River,Urmia Lake basin,Iran

Length–weight and length–length parameters were calculated in the Talkhehrud River, northwestern Iran, for four freshwater fish species belonging to two families. The b values varied between 2.27 and 3.19, with a mean ± SD of 2.2777 ± 0.387. The b parameter values in the length–weight relationship equations were determined as 2.73 for Alburnus atropatenae Berg, 1925; 3.19 for Alburnoides petrubanarescui Bogutskaya & Coad, 2009; 2.92 for Capoeta capoeta (Güldenstädt, 1773); and 2.27 for Oxynoemacheilus persa (Heckel, 1847). This study provides the first reference on the LWRs and LLRs for these species in the Talkhehrud River.     

Length–weight and length–length relationships of four native fish species from the Yalong River,China

Length‐weight and length‐length relationships were estimated for four native fish species from the Yalong River and its tributaries, China. A total of 976 specimens were collected monthly using trap nets and electric fishing in May 2013 and July 2015 to February 2016. This study presents the first references on LWRs (length–weight relationships) and LLRs (length–length relationships) for three species (Gymnocypris firmispinatus, Paracobitis variegatus and Euchiloglanis kishinouyei). Moreover, maturation length, absolute fecundity and predominant food items for the four species were also described in the study.     

Length–weight and length–length relationships for six commercial fishes from southern Korean waters

Presented are the relationships between total length and weight, and between total length and standard length for six commercial fishes collected twice a month from local fish markets in southern Korea between 2005–2006 for Acanthopagrus schlegelii (Bleeker, 1854), Hexagrammos agrammus (Temminck & Schlegel, 1843) and Hexagrammos otakii (Jordan & Starks, 1895), and monthly in 2004 for Dentex tumifrons (Temminck & Schlegel, 1843), Doederleinia berycoides (Hilgendorf, 1879) and Scomberomorus niphonius (Cuvier, 1832). The LWR for D. tumifrons is estimated for the first time, and a new maximum length was recorded for S. niphonius. All total length and weight relationships were significant (all r² > .953). The values of exponent b, estimated using simple linear least squares of log‐transformed weight and length data, ranged from 2.945 to 3.317.     

Length–weight and length–length relationships for some Yangtze River fishes in Tian‐e‐zhou Oxbow,China

Length–weight and length–length relationships are reported for 32 fish species belonging to seven families and 26 genera from the Tian‐e‐zhou Oxbow in the middle reach of Yangtze River, near Shishou City, China. The weight (W) ‐ length (L) relationships were estimated using the logarithmic form of the equation W = aL^b. The exponent b varied from 2.60 to 3.65 (mean ± SE: 3.12 ± 0.25). The 14 weight–length relationships, 13 length–length relationships, and seven maximum lengths are presented to FishBase for the first time.     

Length–weight and length–length relationships of three endemic fish species from the Yarlung Tsangpo River,China

The length‐weight (LWR) and length‐length relationships (LLR) were estimated for three endemic fish species, including Schizothorax waltoni Regan, 1905, Schizothorax oconnori Lloyd, 1908, and Schizothorax macropogon Regan, 1905 in the Yarlung Tsangpo River. A total of 399 specimens were collected using gillnets and cast nets during February to August 2012 and March to May 2013. No information regarding length–weight and length–length relationships was reported previously in FishBase for these three endemic species.     

Length–weight relationship of five commercially important freshwater fish species in the Kashmir Valley,India

Length–weight relationships were analysed for five commercially important freshwater fishes, namely, Bangana diplostoma (Heckel, 1838), Schizopyge niger (Heckel, 1838), Schizothorax curvifrons (Heckel, 1838), Schizothorax plagiostomus (Heckel, 1838) and Glyptosternon reticulatum (McClelland, 1842) from different water bodies in the Kashmir Valley, India. A total of 610 samples were collected between October 2013 and May 2015 using various indigenous cast nets. Of these five species, Schizopyge niger has a new maximum length record for the FishBase LWR database.     

Length–weight and length–length relationships of fish species from the Chi River,northeastern Thailand

The relationships of total length (TL), fork length (FL) and standard length (SL) are presented for four fish species and the relationships between TL and wet weight for 23 fish species from the Chi River in northeastern Thailand. All length–length relationships were linear (r² > 0.95). Slope (b) of the length–weight relationships showed values between 2.5073 and 3.4896.     

Length–weight relationships of five fish species from the Nujiang River (Salween basin), southwest China

This study provides the total length–weight relationships (LWRs) for five fish species collected from the Nujiang River, southwest China. Samples were obtained in May 2015 and May 2016 using drift net and electroshock fishing techniques. A total of 502 specimens belonging to five fish species were analyzed; their LWRs were calculated. The five fish were Schizothorax nukiangensis, Akrokolioplax bicornis, Creteuchiloglanis kamengensis, Channa gachua and Glyptothorax trilineatus. Prior to this study, the length‐weight relationship for S. nukiangensis is unknown to FishBase and new maximum lengths are recorded for A. bicornis and C. kamengensis.These results are useful for fishery research, conservation and management in the Nujiang River.     

Length–weight relationships for 19 headwater fish species from streams in the Sinos River basin,southern Brazil

This study reports the length–weight relationship estimates (LWRs) for 19 fish species inhabiting low order headwater streams in the Sinos River basin of southern Brazil. Between 2010 and 2014, 19 species at 47 sites were sampled in 10 sub‐basins by electrofishing in winter and summer. For two species, Bryconamericus iheringii and Phalloceros caudimaculatus, the estimates in this study offer new maximum size ranges compared to previous studies.     

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 and length–length relationships of three algae‐scraping cyprinid species from Iran

The study presents length–weight relationships (LWRs) and length–length relationships (LLRs) for three algae‐scraper species; Capoeta coadi from the Kouhrang River (Iran; 32°23′N, 50°08′E) a part of the Tigris drainage basin, Capoeta pyragyi from Cheshmeh Langan River (32°55′N, 50°10′E) a part of Zayanderud River basin and Capoeta umbla from Chooman River (35°57′N, 45°47′E). Fish were sampled by electro fishing (Samus1000; Power Out: 200 watts) in August, September and October 2017. Sampling was carried out each months in sites covering an area of about 100 m² including runs, riffles and pools at a water depth of 10–60 cm. The obtained LWRs and LLRs showed a high level of correlation (r² > 0.99).     

Length–weight and Length‐length relations of four fish species from the Chilika Lake,East coast of India

This study reports the length–weight relationship (LWR) and length‐length relationship (LLR) estimated for four fish species inhabiting in Chilika Lake, India. Total 504 specimens were sampled from mono‐filament gill nets (mesh size 12 mm, 22–24 mm, 34–38 mm, 42 mm) during January 2015 to December 2015. The estimated b values from LWR ranged between 2.79 (T. biaculeatus) to 3.29 (C. praeustus). In all species, the relationships between length‐weight and length‐length were highly correlated (p < .05). The study provides first world reports on LWRs and LLRs for all the 4 studied 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 and length–length relationships of four species (Barbus lacerta Heckel, 1843), Oxynoemacheilus angorae (Steindachner, 1897), Squalius lepidus (Heckel, 1843) and Pseudorasbora parva (Temminck & Schlegel, 1846) from the Sirwan River (western Iran)

The study describes the length–weight and length–length relationships for three cyprinid species, namely Barbus lacerta, Squalius lepidus and Pseudorasbora parva, and a balitorid species, Oxynoemacheilus angorae from the Sirwan River (located in Kurdistan and Kermanshah provinces, Iran. This study presents the first reference on LWR for most of the species in their distribution range.     

Length–weight and length–length relationships of three fish species from the Heihe River,northwest China

Length‐weight (LWRs) and length–length (LLRs) relationships are reported for three fish species belonging to two families and two genera from the Heihe River, northwest China. Fish samples were collected using trap nets (mesh size 1 cm) in May and December of 2016, and April and October 2017. Standard length (SL) and total length (TL) for each individual were measured to the nearest 0.1 cm by digital slide caliper and each body weight (BW) was measured to an accuracy of 0.1 g using digital balance. The b‐values for LWRs varied from 2.580 to 3.164 (r² > .956). The results further indicated that the LLRs were highly correlated (r² > .991; p < .01). This study presents the first references on LWRs for Gymnocypris chilianensis and Triplophysa hsutschouensis, and LLRs for G. chilianensis, Triplophysa leptosoma and T. hsutschouensis. This biometric data and their relationships are relevant to the management and conservation of local fishes and fisheries.