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Some aspects of population dynamics of Indian River shad, Gudusia chapra in the greater Jessore region, Southeast Bangladesh

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Research Paper 01/06/2018
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Some aspects of population dynamics of Indian River shad, Gudusia chapra in the greater Jessore region, Southeast Bangladesh

Md. Sherazul Islam, Kakoly Khanam, Nafisa Islam
Int. J. Biosci.12( 6), 129-138, June 2018.
Certificate: IJB 2018 [Generate Certificate]
Key: Gudusia chapraLength-weight relationshipSexual distributionSize-class

Abstract

The Indian river shad Gudusia chapra is an important small indigenous food fish in Bangladesh. The study of the population dynamics particularly length-weight relationship of any fishes forms an important base for fish biology. The statistical relationship between these two parameters has great significance with regard to their morphology, biology, nutrition, condition and growth rate. In the present study, population demography, size-class distribution, length-weight relationship and sexual distribution of G. chapra were analyzed from greater Jessore region, Southeast Bangladesh. A total of 166 individuals were sampled during May to December, 2015 from twelve markets of four sub-districts of Jessore. The maximum length and weight measured 160.02 mm and 31.56 g respectively. The average total length and body weight were 103.63±21.86 mm and11.03±5.80 g respectively and most species was belonging to the size class of 71-130 mm. The size class distribution of the species varied monthly but similar pattern exhibited in both sexes and seasons. The length-weight relationships were Log W= 4.071+2.516 Log L for combined sexes, Log W= 4.137+2.545 Log L for male, Log W=3.931+2.450 Log L for female, Log W=3.929+2.450 Log L in monsoon and Log W= 4.801+2.884 Log L during winter season respectively. The total length and body weight relationship was linear and fish exhibits negative allometric growth as the b<3. The overall sex ratio showed significant differences from the expected value 1:1 (male: female = 1:1.81, χ2 =13.88, p<0.001) and females were dominance over the males throughout the study period.

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