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

Abstract

Summary 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 relationships of three estuarine fish species from Bangladesh

“…Although sample size of Toxotes chatareus was fairly large, the study covered only 65%–70% of the known total maximum length for these species which probably due to the domination of small size fish in these geographical area or environmental constraints. The values of exponent ‘ b ’ for all fish species ( Toxotes chatareus , 2.926; Datnioides polota, 3.106; Chela cachius , 2.968) in the present study were within the normal range of 2.5–3.5 (Froese, ; Hanif, Siddik, Chaklader, Pham, & Kleindienst, ; Islam et al, ; Siddik et al, ; Siddik, Hanif, Nahar, Chaklader, & Kleindienst, ). Albeit the regression parameter ‘ a ’ and ‘ b ’ may vary with sample size, different length standard, sampling season, gonadal maturity, sex and stomach fullness (Hanif, Siddik, Nahar, Chaklader, & Fotedar, ; Wang, Xie, Chang, & Huang, ).…”

Length-weight relationships of three fish species from the Arial Khan River, an outlet of the river Padma, Bangladesh

“…The value of parameter a for A. microlepis ( a = 0.0064) finds to be slightly low than the Bayesian prediction value ( a = 0.00724) whilst M. aral ( a = 0.0030) shows a little bit higher value than the Bayesian prediction value ( a = 0.00295). The b value ( b < 3.0) of A. microlepis for the present study is slightly low that indicates either this species grow more in length than in weight or small size specimens were healthier during sampling, while S. sardinella and M. aral indicates that small size specimen have the same form as like large specimen ( b > 3.00; Hanif, Siddik, Chaklader, Pham, & Kleindienst, ; Jabeen, Choudhury, & Sarma, ). As samples of each species collected over several seasons, the parameters a and b should be treated as mean annual values.…”

Length-weight and length-length relationships of four endemic fish species caught from Payra River, Southern Bangladesh

“…The estimated b value was 3.17 for G. cenia which is almost similar in Ravi River (3.15), north western India (Sharma, Mir, Singh, Akhtar, & Pandey, ). These variations could be related to different environmental and biological factors such as temperature, salinity, food (quantity, quality and size), habitat and gonad development, spawning period season, sex, season, stomach fullness, length range of sampled specimens and health (Hanif, Siddik, Chaklader, et al., ; Lim, Chong, Lim, & Yurimoto, ; Siddik, Hanif, Chaklader, Nahar, & Fotedar, ).…”