Morphological Variation and Length-Weigth Relationship of Labeo angra (Hamilton, 1822) Sampled from Three Different Rivers of Djnaipur (Bangladesh)

We sampled 150 Labeo angra fish from the Punarbhaba, Atrai and Dhepa rivers of Dinajpur, Bangladesh, with total lengths (TL) ranging between 10.6 and 16.7 cm, and determined their length-weight relationships and morphological variation. 17 characters out of 18 morphometric characters showed significant variation (p < 0.05), while three out of eight meristic characters differed among the populations. In the case of morphometric proportions, three out of seven morphometric proportions showed significant variation. The growth was positive allometric (b > 3) for the Punarbhaba River, isometric (b = 3) for the Atrai River, and negative allometric (b < 3) for the Dhepa River. The coefficient of determination (r⁻¹) for the Punarbhaba, Atrai, and Dhepa rivers were 0.942, 0.920, and 0.942, respectively, indicating a high degree of correlation between length and weight.