Length–weight relationships of four freshwater cyprinid species from a tributary of Ganga River Basin in North India

This paper provides length‐weight relationships (LWRs) for four freshwater cyprinid fish species, namely Barilius bendelisis (Hamilton, 1807), Bangana dero (Hamilton, 1807), Chagunius chagunio (Hamilton, 1807) and Labeo dyocheilus (McClelland, 1839) from the Kosi River, a tributary of the River Ganga in northern India. Altogether 848 specimens were caught bimonthly (for B. bendelisis) and quarterly for the other three species between March 2013 and December 2014 using cast nets (9 m length, 9 m width and 1/2 cm mesh size). LWRs for two of the four species (B. dero and C. chagunio) are recorded for the first time. The present study results will be useful for fishery researchers, management and conservation in this least‐explored tributary of the Ganga River Basin.     

Length–weight relationships of 21 fish species from the upland Ganga River Basin tributaries of Central Indian Himalaya

Length–weight relationships (LWRs) are described for 21 fish species belonging to six families from different tributaries of the upland Ganga Basin in India. LWRs for five selected species were unknown to FishBase and new maximum lengths are recorded for 13 species. These results will be useful for fishery research, management and conservation in these tributaries of the Ganga River basin.     

Length–weight relationships of 14 Indian freshwater fish species from the Betwa (Yamuna River tributary) and Gomti (Ganga River tributary) rivers

The length‐weight relationships (LWRs) were studied of 588 fish covering eight families, 13 genera and 14 species (Notopterus notopterus, Gudusia chapra, Labeo calbasu, Puntius sarana, Cirrhinus mrigala, Ompok bimaculatus, Mystus tengara, Mystus cavasius, Sperata aor, Sperata seenghala, Eutropiichthys vacha, Wallago attu, Rhinomugil corsula, and Mastacembelus armatus) captured in the Betwa River (tributary of the Yamuna River) and Gomti River (tributary of the Ganga River) from December 2007 to January 2009. The b values varied between 2.4 (M. armatus) and 3.52 (P. sarana), with the mean b = 2.96 at P < 0.001 for all species. The observations are significant for conservation and management because the Betwa River has been approved under India’s first interlinking plan with the Ken River, and no length‐weight data had thus far been reported for the Gomti River. The objective was to evaluate the LWRs of these two unstudied rivers for fisheries management.     

Length‐weight relationships for 55 freshwater fish species from the Iguatemi River,Upper Paraná River basin,Brazil

This study reports the length‐weight relationship estimatives (LWRs) for 55 fish species caught in the Iguatemi River drainage, Upper Paraná River Basin, Mato Grosso do Sul State, Brazil. The LWRs of 15 of the species are provided for the first time.     

Length‐weight relationships of three freshwater fish species from the Cujubim Sustainable Development Reserve,Amazonas, Brazil

Length–weight relationships (LWR) were provided for three fish species from Cujubim Sustainable Development Reserve, drainages of the Jutaí River Basin, a tributary of the Solimões River, part of the Central Amazon Biodiversity Corridor, Amazonas, Region North of Brazil. Specimens were collected in March 2006 using gill nets with mesh sizes range between 2 and 18 cm. The LWRs for all species are provided by the first time, and two new maximum length are recorded.     

Length–weight relationships of two cyprinid fish species,Crossocheilus latius (Hamilton, 1822) and Garra gotyla gotyla (Gray, 1830) from the Ganga River Basin,India

This study provides length–weight relationship (LWR) information for two fish species (family Cyprinidae), Crossocheilus latius (Hamilton, 1822) and Garra gotyla gotyla (Gray, 1830), from a tributary of the Ganga River Basin, India. Both species had no previous LWR estimates as per Fishbase 2014.     

Length–weight relationships of fish from Madeira River,Brazilian Amazon,before the construction of hydropower plants

Length–weight relationships (LWRs) are presented for 112 freshwater fish species representing 23 families and five orders captured in the Madeira River, the largest white‐water river tributary of the Amazon River. The allometry coefficient (b) of the LWR (Wt = aSL^b) ranged from 2.446 to 3.856 with a median value of 3.102. Eight new LWR records are presented for Amazonian species as information for FishBase. LWRs in the present study provide historical data on a and b coefficients prior to the damming of the Madeira River in November 2011, allowing comparison estimates of predicted future population parameters as influenced by human intervention.     

Length–weight relationships and basic biological information on 64 fish species from lower sections of the Wujiang River,China

The present study provides the length–weight relationships (LWRs) for 64 fish species belonging to eight families from the lower sections of Wujiang River, a tributary of the upper Yangtze River in China. LWRs for eight of these species are unknown to FishBase and new maximum body weights are recorded for 25 species. In addition, some basic biological information on 64 fish species is also summarized. These results will be useful for fishery research, management and conservation in the Wujiang River.     

Length–weight relationships for Eutropiichthys murius (Hamilton, 1822), Coilia reynaldi Valenciennes, 1848 and Johnius gangeticus Talwar, 1991 from lower stretch of the River Ganga,India

Length‐weight relationships (LWRs) for three fish species from the River Ganga (India) is presented. Sampling was conducted from the lower stretch of the River Ganga (Patna: 25°36′51.66″N & 85°12′7.02″E to Freserganj: 21°35′40.58″N & 88°15′28.92″E) during April, June and September and December of 2017. Specimens were caught using gill nets (18 nos.; mesh 18–32 mm), and bag nets (3 nos.; mesh 14–22 mm). The values a and b from LWRs ‐were found to be 0.007 and 2.977 for Eutropiichthys murius; 0.003 and 3.001 for Coilia reynaldi; 0.009 and 3.010 for Johnius gangeticus.     

Length–weight relationships of two endemic fish species in the Júcar River Basin,Iberian Peninsula

This study provides length‐weight relationship (LWRs) information for two fish species (family Cyprinidae) in two headwater streams of the Júcar River Basin (Eastern Iberian Peninsula). Both species are endemic to the Iberian Peninsula and have no previous LWR estimates.     

Length–weight relationships for four species in the Dogxung Zangbo River,a main tributary of the Yarlung TsangpoRiver,Tibet, China

Length‐weight relationships (LWRs) for four species are presented, captured in the Dogxung Zangbo River, a main tributary of the Yarlung Tsangpo River, Tibet, China. Fish were captured in summer and autumn between May 2006 and September 2017 with three fyke nets from six sites.The results of LWRs for Schizothorax oconnori Lloyd, 1908, Schizopygopsis stoliczkai Steindachner, 1866, Triplophysa orientalis (Herzenstein, 1888), and Glyptosternon maculatum (Regan, 1905) provide basic data useful in fisheries science. They can assist in converting length data in to weight and biomass in cases where weight can not be taken during field studies. If regularly taken in an annual monitoring programm together with other parameters, using a standardized sampling procedure, they can also helpful in stock assessment of fish species in the Dogxung Zangbo River and the upper reaches of the Yarlung Tsangpo River basin.     

Length–weight and length–length relationships of 26 fish species from the Yiluo River,a tributary of the Yellow River,China

From February to October 2016, a total of 9,754 fish specimens were collected from the Yiluo River, a tributary of the Yellow River, China's second longest river. Based on these samples, length–weight relationships (LWRs) and length–length relationships (LLRs) were estimated for 26 species. Among these data, LWRs for 1 species, LLRs for 11 species, and maximum total lengths for six species were not previously recorded in FishBase. The a values of the LWRs varied between 0.0019 and 0.0116, and b values from 2.805 to 3.883. All regressions for LWRs and LLRs were highly significant (p < .001). These results will be useful for sustainable management and conservation of the fish resources in the Yiluo River and the Yellow River ecosystem.     

Length‐weight relationships for 22 neotropical freshwater fishes from a subtropical river basin

This paper presents length‐weight relationships (LWR) for 22 species from the Pitangui River Basin, Brazil. For six of these species these are the first LWR records; for nine other species these are the first LWRs recorded in FishBase.     

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 33 selected fish species from the Cauca River Basin,trans‐Andean region,Colombia

This study provides length–weight relationships (LWRs) for 33 fish species sampled with several types of fishing gear in six expeditions between 2010 and 2011, during the dry and wet seasons in the middle and lower Cauca River Basin, Northern Colombia. The report represents the first reference on LWRs for 28 species and also provides the new maximum size for 15 species.     

Length-weight and length-length relationships of three fish species from the lower Yalong River,China

Length-weight relationships (LWRs) and length-length relationships (LLRs) were evaluated for three endemic fish species sampled from the lower Yalong River and its biggest tributary (the Anning River), in China. Specimens were captured using set gillnet (mesh size 4 cm) and backpack electro-fishing (power output 400 W, depth fished 1 m, area covered 3 m²) from June to July 2018. LWRs and LLRs are presented for the following species (Sinogastromyzon sichangensis, Micropercops swinhonis and Percocypris pingi).     

Length–weight relationships of three catfish species from a tributary of the Dhaleshwari River,Bangladesh

The present ichthyological report describes the length‐weight relationships (LWRs) of three catfish species (Eutropiichthys murius, Nangra nangra and Gagata viridescens) belonging to two families from the Kaliganga River, a tributary of the Dhaleshwari River, Bangladesh. The analyses included 306 specimens collected monthly from fishermen's catches during October 2015 to April 2016. Ranges of regression parameters a and b of the three species were within 0.0058–0.0099 and 2.900–3.142, respectively with highly correlated coefficients of determination (r² > .995; p < .001). The LWRs for all three species presented herein for the first time with a new maximum length record for N. nangra.     

Length–weight and length–length relationships and length at first maturity for freshwater fish species of the Salto Santiago Reservoir,Iguaçu River Basin,Brazil

Length‐weight (LWR) and length‐length (LLR) relationships were estimated for 20 species and lengths at first maturity (L₅₀) for six species of freshwater fishes caught in the Salto Santiago Reservoir, Iguaçu River Basin, Brazil. In nine species significant differences were found in the LWR between sexes. Average b‐value for species with no differences between sexes in LWR was 3.12 (SE = ±0.05). Average b‐value in LLR was 0.823. First references on LWRs and L₅₀ are presented for 13 and four fish species, respectively, as well as the new maximum total lengths for eight species.     

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 10 fish species from two tributaries of Indus River Basin in Jammu and Kashmir,India

Length‐weight relationships (LWRs) are described for 10 fish species belonging to three families from the Jhelum and Poonch River, tributaries of the Indus river basin in India. LWRs for these species were unknown to FishBase and new maximum lengths are recorded for three species. These results will be useful for fishery research, management and conservation in these tributaries of Jammu and Kashmir.