Length–weight relationships of wild and farmed Tor putitora from Pakistan

Length–weight relationships (W = a TL^b) were estimated for wild and farmed Tor putitora obtained from River Korang, Islamabad and Attock District, Pakistan, respectively. The results indicate, W = 0.0171 TL^2.85 for wild and W = 0.1000 TL^2.33 for farmed. Total length ranged from 18.0 to 40.2 cm for male and 31.6 to 37.0 cm for female wild Tor putitora, indicating that the fish are now much smaller. The first reference of length–weight relationships for Tor putitora is provided.     

Length–weight relationship of giant snakehead,Channa marulius and stinging catfish,Heteropneustes fossilis from the River Ganga,India

The present study describes the length–weight relationship of two commercially important freshwater fish species of India viz., Channa marulius and Heteropneustes fossilis collected from the Ganga River, during the period January 2009–December 2010.     

Condition factor,length–weight and length–length relationships of an endangered fish Ompok pabda (Hamilton 1822) (Siluriformes: Siluridae) from the River Gomti,a tributary of the River Ganga,India

The present study describes the condition factor, length‐weight and length‐length relationships for an endangered freshwater fish species Ompok pabda (Hamilton) of the family Siluridae from the River Gomti in Northern India. The values of regression parameter b ranged from 2.81 to 3.32 (r² > 0.90). During the pre‐monsoon, the allometric coefficient b of the LWR was close to isometric value (b = 3.08) allometric (b = 2.87), although it suggested negative allometric growth in monsoon periods while positive growth in post‐monsoon. The condition factor values ranged from 0.672 to 0.744. Results of the present study could be useful to help in conservation and sustainable fisheries management of this endangered species.     

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 relationship for seven freshwater fish species from Brazil

The present study reports length‐weight relationships for seven native freshwater fish species (Triportheus angulatus, Psectrogaster rhomboides, Prochilodus brevis, Leporinus piau, Cichlasoma orientale, Crenicichla menezesi, and Pimelodella gracilis) captured in a semiarid Brazilian reservoir located in the state of Rio Grande do Norte.     

Length–weight,length–length relationships and feeding habits of wild Indus Mahseer,Tor macrolepis,from Attock,Pakistan

In this study the length–weight (LWR) and length–length relationships (LLR) were carried out for Indus Mahseer, Tor macrolepis, from the Haro River and Nalah Kala, Attock, Pakistan. A total of 118 specimens were used to estimate the relationship parameters. The results of LWR (W = a TL^b) from five different sites indicated W = 0.0044 TL^3.14, W = 0.0054 TL^3.08, W = 0.0059 TL^3.21, W = 0.0076 TL^3.12, and W = 0.0107 TL^2.99, respectively, with an overall value of W = 0.0100 TL^2.94. All regressions for LLR were highly significant (P ≤ 0.001), with coefficient of determination (r²) values of > 0.90. All relationships for LWR and LLR were found to be isometric. T. macrolepis is principally a herbivorous bottom feeder, mainly feeding on aquatic plants and algae, supplemented by insects.     

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 relationship of 62 fish species from the Central Aegean Sea,Turkey

Length–weight relationships were estimated for 11 elasmobranch and 51 teleost fish species caught in Izmir Bay, Turkey. Sampling was carried out from June 2005 to May 2006 at monthly intervals using a bottom trawl net. The mean b‐value was calculated as 3.10 (SE = ±0.03) and only three species were out of range between 2.5 and 3.5.     

Length–weight relationships (LWRs) of 12 Indian freshwater fish species from an un‐impacted tropical river of Central India (River Ken)

The length–weight relationships (LWRs) were studied of 441 fish individuals covering six families, eight genera and 12 freshwater species (L. dyochilus, L. calbasu, L. gonius, L. fimbriatus, P. sarana, L. boggut, C. mrigala, W. attu, B. bagarius, E. vacha, N. notopterus and S. aor) captured in the River Ken (tributary of the Yamuna River) from December 2007 to January 2009. The b value ranged from 3.52 for Cirrihinus mrigala, to 2.11 for Labeo gonius, with a mean of 3.03 at p < 0.001 for all species. The present observations are significant for conservation and management because the Ken River has been approved under India’s first interlinking plan with the River Betwa. The objective was to evaluate the LWRs of the freshwater fish species of an unimpacted and understudied river, which serves as a baseline for comparison to other relatively altered tropical Indian rivers.     

Length–weight relationship and seasonal condition in Capoeta sieboldii in the upper Çoruh River,Turkey

Seasonal variations in Fulton’s condition factor (K) and the length–weight relationship (LWR) were investigated for Capoeta sieboldii in the upper Çoruh River (Turkey) from March 2000 to February 2001. There was a slight seasonal variation in condition, with generally lower values in summer and winter, and higher values in autumn. LWR was calculated as W = 0.016 × L^2.933, W = 0.014 ×L^3.001, and W = 0.009 × L^3.118 for males, females, and juveniles, respectively.     

Length–weight relationships of sixteen freshwater fishes from the Hacha River and its tributaries (Amazon Basin,Caquetá, Colombia)

Body length and weight relationships were estimated for sixteen native freshwater fish species (ten Characidae, three Loricariidae, two Heptapteridae and one Astroblepidae, mainly small‐sized fish) collected in the Andean piedmont Hacha River (Caquetá, Colombia) by electrofishing. These are the first length–weight and length–length parameters reported for the species, which are mostly endemic to the Amazonian basin. Maximum lengths in eight of the sixteen studied species are also reported. Knowledge of this biometric data and their relationships can be relevant in the management and conservation of the local fish and fisheries.     

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 of nine fish species from Xingkai (Khanka) Lake,Heilongjiang, China

In this study the length–weight relationships of nine fish species from Xingkai (Khanka) Lake in China belonging to three families and eight genera were analyzed. A total of 273 specimens were used to estimate the relationship parameters. Four of these species (Chanodichthys dabryi, Hemibarbus maculatus, Tachysurus fulvidraco and Cyprinus carpio haematopterus) had no previous estimations and one maximum length is new to science for inclusion in FishBase.     

Length–weight relationships of 26 fish species from the middle section of the Negro River (Tacuarembó‐Durazno,Uruguay)

This study provides data on the length–weight relationship (LWR) for 26 species of neotropical fishes. Specimens were collected between 2008 and 2009 from a dam‐enclosed section of the middle Negro River (Uruguay). This study represents the first reference on length–weight relationships for 17 species, and also provides new maximum sizes for eight species.     

Length–weight relationships of four freshwater ornamental fish species from the Brazilian Negro River basin

The present work reports the length–weight relationships (LWR) for four ornamental fish species from the middle Negro River basin, Amazonas, Brazil. The r² value ranged from 0.810 to 0.941 and values of b varied from 2.346 to 3.442. These results represent the first reference on LWR for all four species, based on FishBase.     

Length–weight relationships of 14 coastal fish species from Punta del Diablo (Rocha,Uruguay)

This study provides information on length‐weight relationships for 14 marine fish species. Specimens were collected between 2006 and 2010 from the Uruguayan coastal zone (depth < 15 m) in Punta del Diablo, Rocha during a biodiversity monitoring program. This study represents the first reference on length‐weight relationships for two endangered Rajidae species and confirms the presence of the Stellifer rastrifer, whose distribution range has been extended southwards recently.     

Length–weight and length–length relationships of three fish species (Cyprinidae) from Chahnimeh reservoirs,Zabol, in eastern Iran

Length–weight (LWR) and length–length (LLR) relationships was estimated for three fish species collected in Chahnimeh reservoirs located in the city of Zabol, Iran. The values of the parameter slope (b) in the length–weight relationship were determined 2.45 for Crossocheilus latius, 2.97 for Schizocypris altidorsalis and 3.14 for Schizothorax zarudnyi. The relationships between TL, FL and SL were all linear (for all cases: r² > 0.93).