Length-Weight relationship of mature Hilsa, Tenualosa ilisha in Bangladesh

Abstract

An experiment was carried out to determine the length, weight, and Length-Weight Relationship of mature hilsa, Tenualosa ilisha, in Bangladesh to better manage the fish species. Total 480 Samples were collected from Meghna River, Chandpur, from July 2012 to June 2013 and Tentulia River, Barisal, from June 2013 to June 2014. Total length (TL) was measured using a measuring scale, and body weight (BW) was taken using an electric balance. Length-weight relationship (LWR) and the relative condition factor (Kn) of fishes were determined. In the case of female hilsa from Chandpur, the mean TL value varied from 37.21±0.81 to 42.58±0.80 cm, and for male, the mean TL value varied from 34.25±0.55 to 37.03±0.75. For female hilsa Barisal, the mean TL value for female hilsa was found to vary from 37.48±0.90 to 41.18±0.78 cm, and males, the mean TL value varied from 34.80±0.69 to 37.19±0.59 cm. In the case of female hilsa Chandpur, the mean body weight varied from 762 ± 88.36 to 987.00 ± 113.07 g, and for males, the value varied from 453.60±19.25 g to 626.00 ± 18.02 g. For female hilsa Barisal, the mean body weight varied from 639.50 ± 0.71g to 992.00±61.93g, and for males, the value varied from 523.00±35.96 g to 598.00 ± 31.26 g. The highest Kn value for female was recorded in October (1.0688), the lowest was in May (0.8607), and the highest male Kn value was observed in November (1.0197), but the lowest was in July (0.9974) for hilsa in Meghna River, Chandpur. The highest female Kn value was found in April (1.0895), and the lowest was in December (0.9023). The highest male Kn value was observed in October (1.032), but the lowest was in July (0.9988) for hilsa in Tentulia River, Barisal.