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Population structure of Nile tilapia and its impact on fisheries of a tropical impacted reservoir, Central India

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Title Population structure of Nile tilapia and its impact on fisheries of a tropical impacted reservoir, Central India
Not Available
 
Creator Canciyal Johnson
Uttam Kumar Sarkar
Sathis Kumar Koushlesh
Archan Kanti Das
Basanta Kumar Das
Bablu Kumar Naskar
 
Subject Population dynamics
Nile tilapia
FiSAT-II
Growth parameters
CPUE
Central India
Length-weight relationship
 
Description Not Available
Length-frequency data of Nile tilapia (Oreochromis niloticus) was studied using 1250 specimens of both sexes combined with
maximum length and weight of 44.5 cm (TL) and 1050 g respectively through gill net catch at different landing sites of Halali
Reservoir, Madhya Pradesh. The data were grouped into classes of 10-mm intervals and various parameters of population
dynamics of fish were analysed and computed using the FiSAT-II software package (FAO-ICLARM Stock Assessment
Tools). The length-weight parameters were found to be at W= 0.001 L 2.96 where b = 2.96 and a = 0.001. Growth parameters
L∞ and K of the species were L∞ = 46.73 cm and K = 0.63/year respectively; the annual rates of natural (M) and fishing mortality
(F) were found to be 0.60 and 0.72 respectively. The estimated values for the exploitation rate (E) using the length-converted
catch curve and virtual population analysis were 0.54 and 0.42 respectively. The recruitment pattern shows that O. niloticus was
recruited in the fishery during April with one peak. Based on the data analysis, the stock in the Halali Reservoir does not exceed
the maximum fishing pressure (Emax = 0.55) and there is selective mortality towards adult fish sizes. The introduction of Nile
tilapia improved the total catch per unit of effort (CPUE), as well as increased the number of active fishers. Conversely, a
significant reduction in the CPUE of other commercially important indigenous species was observed after the introduction ofNile
tilapia in the reservoir. Therefore, for management purpose, this study suggests that the existing effort in terms of gill net mesh
size which target size (TL—15.0 to 25.0 cm) individuals of length group is to be increased to exert more fishing pressure on Nile
tilapia population in the reservoir to decline its abundance in the long term.
Not Available
 
Date 2021-08-11T06:37:16Z
2021-08-11T06:37:16Z
2020-05-11
 
Type Research Paper
 
Identifier Johnson, C., Sarkar, U. K., Koushlesh, S. K., Das, A. K., Das, B. K., & Naskar, B. K. (2020). Population structure of Nile tilapia and its impact on fisheries of a tropical impacted reservoir, Central India. Environmental Science and Pollution Research, 27, 29091-29099.
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/54653
 
Language English
 
Relation Not Available;
 
Publisher Springer