Stock’s Status of Elongate Glass-Perchlet Chanda nama in the Ganges River (Bangladesh): Suggestions for Future Proper Management

Abstract

The Elongate glass-perchlet Chanda nama Hamilton, 1822 is broadly found in Bangladesh, Myanmar, India, Pakistan, and Nepal. Our study represents a detailed report on stock status such as population structure, growth parameter (asymptotic length, L ∞ ; growth co-efficient, K; age at zero length, t 0 ; growth performance index, Ø'), life span (t max ), mortality (total, Z; natural, M; fishing, F), recruitment pattern, exploitation rate (E) and maximum sustainable yield (MSY) of ray-finned Chanda nama for the first time from the Ganges River of north-western Bangladesh. A sum of 1260 fish was collected during January to December 2017. The total length (TL) was recorded in the range of 3.3 to 9.9 cm. The negative allometric growth pattern was assessed through the b value < 3.0. Further, the L ∞ was 10.25 cm as well as K was found 0.55 year -1 . The Ø' was calculated as 1.762, t 0 was 0.057 years while the t max was estimated as 2.49 years. In addition, the Z, M, and F were obtained as 3.11, 1.63, and 1.48 year -1 , respectively. The trend of recruitment was continual through one peak occurrence in May-July. Length of the first capture (L c 50) observed at TL of 3.32 cm. However, the exploitation rate (E) was assessed as 0.48 whereas the maximum allowable yield (E max ) was 0.46. The maximum sustainable yield was estimated as 4.51 metric tons. Consequently, the information from this study would be beneficial for the implementation of a proper management strategy in the Ganges River and the related ecosystems.