Length-Weight Relationship and Reproductive Biology of the Indian River Shad, Gudusia chapra (Hamilton, 1822) from Central Brahmaputra Valley of Assam, North-East India
Length-Weight Relationship and Reproductive Biology of the Indian River Shad, Gudusia chapra (Hamilton, 1822) from Central Brahmaputra Valley of Assam, North-East India
Abdul Malik Ahmed, Bhargav Bhushan Nath, Ayub Ali, Jiten Sarma, Bipul Phukan, Imtiaz Ahmed* and Jyotirmoyee Das
ABSTRACT
The Indian River shad, Gudusia chapra (Hamilton, 1822), is a very popular food fish with high market price in the Central Brahmaputra Valley of Assam. A total of 458 specimens comprising of 161 males and 297 females with total length (TL) 7.8 to 15.6 cm and total weight (TW) 5.01 to 38.19 gm were collected monthly basis from August 2017 to July, 2018 from Thekera beel (wetland) of Morigaon District of Assam. The length-weight relationship of Gudusia chapra was found to be W=0.01L2.897, W=0.01L2.9165 and W=0.01L2.9214 for male, female and pooled samples, respectively. The ‘b’ value was recorded to be deviating (P<0.01) from the value of ‘3’ indicating a negative allometric growth of the species. The overall sex ratio (M:F) was 1:1.84 (Chi-square 40.38, P <0.01), indicating the predominance of females over males. Monthly analysis data of Gonado Somatic Index (GSI) showed two peaks with one in April and another in August suggesting Gudusia chapra breeds twice a year. The species was recorded to be highly fecund with fecundity ranging from 7,095-48,238. The relationship between fecundity and variables viz total length, body weight and ovary weight were observed to be linear and highly significant (r =0.979).
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