LENGTH- LENGTH, LENGTH- WEIGHT RELATIONSHIP AND CONDITION FACTOR OF NINE FISH SPECIES FROM THE ATRAI RIVER, DINAJPUR, BANGLADESH

Abstract

The objectives of this study were to describe the length-length relationship (LLR), length-weight relationship (LWR) and condition factors of nine indigenous freshwater fish species, Acanthocobitis botia, Botia dario, Botia lohachata, Chanda nama, Canthophrys gongota, Esomus danricus, Labeo gonius, Lepidocephalicthys guntea and Ompok pabda collected from the Atrai river in Dinajpur, Bangladesh from November 2015 to April 2016. Relationship equations among different body length parameters of each species were found highly significant (P>0.05). LWR Indicated positive allometric growth for A. botia, B. dario, C. nama, C. gongota, E. danricus and L. gonius (b>3). Two fishes L. guntea and O. pabda showed negative allometric growth (b<3) while B. lohachata showed isometric pattern of growth (b=3). A T-test of the observed body weight (Wo) versus the calculated body weight (Wc) for these species produced no significant difference (P>0.05) between the observed weight and the calculated weight. Length-length relationships showed that the relationships are low to highly (R2 < 0.990) significant. Length-weight relationships for five species and length-length relationships for seven fish species, were not available in FishBase. The information attained from this study will be helpful for the fishery managers to apply adequate regulations for sustainable fishery management in the water bodies of Dinajpur district as well as the other parts of the country.