Condition, length–weight and length–length relationships of the silver hatchet Chela,Chela cachius(Hamilton, 1822) in the Old Brahmaputra River of Bangladesh

Abstract

The silver hatchet chela, Chela cachius (Hamilton, 1822), is a cyprinid freshwater species, commercially important for both subsistence and artisanal fisheries in Bangladesh. This study describes the length-weight relationship (LWR), length-length relationship (LLR) and the condition of this minnow species from the Old Brahmaputra River in Bangladesh. In this study, 12 monthly samples totalling 2400 specimens (1172 male; 1228 female) collected from November 2004 to October 2005 were used to conduct this study. For each individual, the total length (TL), fork length (FL) and standard length (SL) as well as body weight (BW) were measured. The overall sex ratio showed no significant difference from the expected value of 1:1 and the analysis of covariance (ANCOVA) revealed no significant difference between LWRs of male and female for the pooled data over a year. Parameters of LWRs of combined gender varied monthly with high coefficients of determination (r 2 4 0.751; p 5 0.001). All the LLRs (SL vs. FL, FL vs. TL and SL vs. TL) exhibited strong correlations (r 2 4 0.886; p 5 0.001) and ANCOVA analyses further indicated that LLRs did not differ between males and females. The relative-condition factors with regard to both months and SLs varied in all gender groups. Females maintained similar mean condition throughout life and showed more plumpness than both males and combined genders in all months. Finally, the results should be useful for the sustainable management of this minnow species in Old Brahmaputra River and adjacent water-bodies.

Length-weight relationship of ten indigenous freshwater fish species from Gandak River, Bihar, India

“…).The b values for Salmostoma bacaila, Botia lohachata, Ompok pabda and Trichogaster lalius were found to be quite close to the findings ofBorah et al (2017);Gupta, Sarkar, Bhardwaj, and Pal (2011);Hossain et al (2012)andIslam and Mia (2016) respectively Ahmed, Hossain, and Ohtomi (2012). found that b value in C. cachius ranged from 2.42 in October to 3.55 in July from old Brahmaputra River, Bangladesh.…”

“…Ahmed, Hossain, and Ohtomi (2012) found that b value in C. cachius ranged from 2.42 in October to 3.55 in July from old Brahmaputra River, Bangladesh. The b value for S. cascasia in this study fit the expected range (2.81-3.15)…”

Distribution of anchovy length size using puring net in Pulolampes Waters, Brebes Regency of Central Java

“…Perairan Pulolampes Brebes merupakan perairan dangkal dengan gugusan karang jeruk yang baik bagi habitat ikan teri dan menjadi daerah penangkapan ikan nelayan. Hal ini diperkuat oleh pendapat Hutomo et al (1987) 1] yang menyatakan bahwa Teri mempunyai sifat pelagik yang umumnya hidup dalam gerombolan (shoaling), menghuni perairan pesisir dan estuaria, tersedianya banyak makanan dan kadar garam yang relatif rendah.…”

Effects of pool isolation on trophic ecology of fishes in a highland stream

“…Condition was compared among sections using mass ( M ) as the dependent variable and L S as the covariate. This relationship has been established as a good predictor of fish condition and was compared between sections using an ANCOVA (Le Cren, ; Petrakis & Stergiou, ; Moutopoulis & Stergiou, ; Ahmed et al , ). To determine if fishes were compensating for a reduction in nutrients by increasing consumption, an ANCOVA model was used for each species during each sample with L S as the covariate, total mass of prey items in the GIT as the dependent variable and section of stream as the independent variable.…”