Length-weight relationships ofBarilius bendelisis(Hamilton, 1807), Barilius shacra(Hamilton, 1822) andBarilius barna(Hamilton, 1822) from Manas River in Assam, India

Abstract

Summary The present study describes the length–weight relationships (LWRs) for three ornamental hill stream fish species from the Manas River in Assam, India, namely, Barilius bendelisis (Hamilton, 1807), Barilius shacra (Hamilton, 1822), and Barilius barna (Hamilton, 1822). Fishes were collected on a monthly basis from March 2015 to February 2016 with cast nets (270 cm, 1.2 cm) and gillnets (7,500 × 130 cm, 5 cm). This is the first information on LWR data for two of the species.

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, 2017;Jabeen, Choudhury, & Sarma, 2016). As samples of each species collected over several seasons, the parameters a and b should be treated as mean annual values.…”

Length–weight relationships of three carangid fish species Alepes vari (Cuvier, 1833), Uraspis uraspis (Günther, 1860) and Carangiodes oblongus (Cuvier, 1833) from the Bay of Bengal coast, Bangladesh

“…The calculated value of “ b” for all three species variated within the expected limit 2.5–3.5 (Hanif, Islam, Siddik, & Chaklader, ; Islam et al, ; Nahar, Hanif, Siddik, Chaklader, & Islam, ; Siddik, Hanif, & Chaklader, ; Siddik, Hanif, Chaklader, Nahar, & Mahmud, ). For A. vari , b ≈ 3 which indicates that small size individuals in the sample have similar form as larger size one (Froese, ; Jabeen, Choudhury, & Sarma, ) while for U. uraspis and C. oblongus , b < 3 indicates both the species grow faster in length compared to weight and small‐sized individuals were in good nutritional condition during the sampling period. The observed value of parameter “ b ” for A. vari and C. oblongus represents is higher than the Bayesian LWRs value while the value is somewhat lower for U. uraspis .…”