Reproductive biology length-weight relationship and population parameters of a marine ornamental fish Abudefduf vaigiensis (Quoy Gaimard 1825) (Osteichthys Pomacentridae) from the shallow waters of Visakhapatnam Coast

Sudhakar G. V. S., . and Shameem A., . Reproductive biology length-weight relationship and population parameters of a marine ornamental fish Abudefduf vaigiensis (Quoy Gaimard 1825) (Osteichthys Pomacentridae) from the shallow waters of Visakhapatnam Coast. pp. 1117-1129. ISSN 0116-6514

An attempt has been made to study the reproductive biology length-weight relationship relative condition factor and other population dynamics of Abudefduf vaigiensis of Visakhapatnam coast. The regression coefficients of length and weight in males and females showed a significant difference hence separate equations were developed. The equations obtained were: males: log W -4.6392 2.9681.log L (r0.96); females: log W -4.5023 2.9048.log L (r0.95). The mean relative condition factor (Kn) values ranged from 0.992 to 1.027 in males and 0.983 to 1.019 in females. In males and females low Kn values were clearly related with the spawning season. Size at first maturity was estimated at 126 mm. Ripe specimens were observed in length groups 121-150 mm between October and March. The females marginally dominated the catch and the average sex ratio of males to females for the study period was 1:1.36. Fecundity ranged from 11 294 to 40 208 and average fecundity was estimated as 19 548. Fecundity increased with total length fish weight and ovary weight. Population dynamics parameters estimated were: L 180.27 mm K0.48 per year (growth performance index) 2.508 natural mortality coefficient (M) 1.07377 per year total mortality coefficient (Z) 1.29277 per year fishing mortality (F) 0.219 exploitation ratio (E) 0.2039.

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Abstract

An attempt has been made to study the reproductive biology length-weight relationship relative condition factor and other population dynamics of Abudefduf vaigiensis of Visakhapatnam coast. The regression coefficients of length and weight in males and females showed a significant difference hence separate equations were developed. The equations obtained were: males: log W -4.6392 2.9681.log L (r0.96); females: log W -4.5023 2.9048.log L (r0.95). The mean relative condition factor (Kn) values ranged from 0.992 to 1.027 in males and 0.983 to 1.019 in females. In males and females low Kn values were clearly related with the spawning season. Size at first maturity was estimated at 126 mm. Ripe specimens were observed in length groups 121-150 mm between October and March. The females marginally dominated the catch and the average sex ratio of males to females for the study period was 1:1.36. Fecundity ranged from 11 294 to 40 208 and average fecundity was estimated as 19 548. Fecundity increased with total length fish weight and ovary weight. Population dynamics parameters estimated were: L 180.27 mm K0.48 per year (growth performance index) 2.508 natural mortality coefficient (M) 1.07377 per year total mortality coefficient (Z) 1.29277 per year fishing mortality (F) 0.219 exploitation ratio (E) 0.2039.

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Item Type:	Article
AGROVOC Term:	Marine fishes
AGROVOC Term:	Ornamental fishes
AGROVOC Term:	Osteichthyes
AGROVOC Term:	Pomacentridae
AGROVOC Term:	Induced spawning
AGROVOC Term:	Coastal waters
AGROVOC Term:	Animal reproductive organs
AGROVOC Term:	Length
AGROVOC Term:	Body weight
AGROVOC Term:	Animal population
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7812

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