Population Parameters of the Minor carp Labeo bata (Hamilton, 1822) in the Ganges River of Northwestern Bangladesh

Jordan Journal of Biological Sciences

Md. Alomgir Hossen¹ 

关键词: Labeo bata;    growth;    condition;    maturity;    mortality;    Ganges River;   

DOI  :  

学科分类：生物科学（综合）

来源: Hashemite University, Deanship of Research and Higher Studies

【 摘 要 】

The Minor carp, Labeo bata (Cyprinidae), is one of the important fish species in northwestern (NW) Bangladesh. This study illustrates the population parameters of L. bata i.e., population structure (length-frequency distributions; LFDs), growth (length-weight relationships, LWRs; length-length relationships, LLRs), condition factors (allometric, KA; Fulton's, KF; relative, KR; relative weight, WR), form factor (a3.0), reproduction (length at first maturity, Lm) and natural mortality (Mw) in the Ganges River, NW Bangladesh. Samples were collected occasionally between July, 2013 to June, 2014 using different fishing gears i.e., gill net (mesh sizes: 2.5–3.5 cm) and cast net (mesh sizes: 1.5–3.0 cm). A total 157 individuals of L. bata were collected, where sixty-nine were male, and eighty-eight were female. The sex ratio did not fluctuate significantly from the anticipated 1:1 ratio (df =1, χ2=2.30, p>0.05). Total length varied from 7.9 to 25.2 cm and body weight ranged from 4.68 to 181.35g. All LWRs were highly significant (p0.05). The allometric coefficient (b) indicated positive allometric growth in both sexes (b>3.00, p<0.01). All LLRs were highly correlated (p<0.001), and most of the r2 values were ≥0.992. Among four condition factors, KF was the best fitted, and can be used as indicator of safe life for L. bata in the Ganges River. Wilkoxon Sign Ranked Test for WR showed no considerable dissimilarity from 100 for male (p=0.295) and female (p=0.057). The a3.0 for both sexes was 0.0108. The Lm for male and female population was 14.12 cm and 14.60 cm in TL, respectively. The Mw for the population of L. bata was 0.86 year-1 in the Ganges River. This result would be effective for a sustainable management of this Minor carp in Bangladesh and its adjoining ecosystems.

【 授权许可】

CC BY