Reproductive aspects of the black pomfret Parastromateus niger in the Kuwaiti waters of the Arabian Gulf

Dadzie S., . and Abou-Seedo F., . and Gomes T., . Reproductive aspects of the black pomfret Parastromateus niger in the Kuwaiti waters of the Arabian Gulf. pp. 265-275. ISSN 0116-6514

The reproductive activities of the male and female black pomfret Parastromateus niger in Kuwaiti waters were investigated from October 2003 to September 2005. Analysis of seasonal variations in the gonadosomatic index (GSI) during the two-year study period revealed high values from February to September suggesting that the black pomfret has a prolonged spawning season from February to September. GSI fluctuations correlated positively with rising water temperatures in Kuwait from low values in both parameters in January to high values in February/ March (r 0.836 p0.05 for males and r 0.764 p0.05 for females) suggesting that temperature plays a role in triggering spawning in both the sexes. Analysis of seasonal distribution of maturity stages for the two years revealed the presence of ripe/running males and females from February to September thus confirming the spawning periodicity revealed through the analysis of fluctuations in the GSI. Macroscopic and microscopic studies of maturity stages revealed six stages in the males and seven in the females. The logistic function based on pooled data for the two years revealed that the minimum size at sexual maturity (L‚‚) was attained at a size of 30.9 cm SL in males (r 0.284) and 36.5 cm SL in females (r 0.355). The ratio of males to females in monthly samples did not depart significantly from the hypothetical 1:1 during the entire study period (·2 61.9 d.f. 11 p 0.05). Total fecundity ranged from 71 305 in a fish measuring 39.8 cm SL and weighing 1 572.5 g to 3 895 449 in a 49 cm SL and 2 630 g fish with a mean of 1 216 734 eggs. Positive correlations were found between fecundity and ovary-free body weight standard length and ovary weight and a negative one with egg size. The average relative fecundity was 948 eggs/g ovary-free body weights which was neither a function of fish standard length nor ovary-free body weight.

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Abstract

The reproductive activities of the male and female black pomfret Parastromateus niger in Kuwaiti waters were investigated from October 2003 to September 2005. Analysis of seasonal variations in the gonadosomatic index (GSI) during the two-year study period revealed high values from February to September suggesting that the black pomfret has a prolonged spawning season from February to September. GSI fluctuations correlated positively with rising water temperatures in Kuwait from low values in both parameters in January to high values in February/ March (r 0.836 p0.05 for males and r 0.764 p0.05 for females) suggesting that temperature plays a role in triggering spawning in both the sexes. Analysis of seasonal distribution of maturity stages for the two years revealed the presence of ripe/running males and females from February to September thus confirming the spawning periodicity revealed through the analysis of fluctuations in the GSI. Macroscopic and microscopic studies of maturity stages revealed six stages in the males and seven in the females. The logistic function based on pooled data for the two years revealed that the minimum size at sexual maturity (L‚‚) was attained at a size of 30.9 cm SL in males (r 0.284) and 36.5 cm SL in females (r 0.355). The ratio of males to females in monthly samples did not depart significantly from the hypothetical 1:1 during the entire study period (·2 61.9 d.f. 11 p 0.05). Total fecundity ranged from 71 305 in a fish measuring 39.8 cm SL and weighing 1 572.5 g to 3 895 449 in a 49 cm SL and 2 630 g fish with a mean of 1 216 734 eggs. Positive correlations were found between fecundity and ovary-free body weight standard length and ovary weight and a negative one with egg size. The average relative fecundity was 948 eggs/g ovary-free body weights which was neither a function of fish standard length nor ovary-free body weight.

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Item Type:	Article
AGROVOC Term:	Parastromateus niger
AGROVOC Term:	Carangidae
AGROVOC Term:	Pomfrets
AGROVOC Term:	Marine fishes
AGROVOC Term:	Reproductive physiology
AGROVOC Term:	Seasonal variation
AGROVOC Term:	Spawning
AGROVOC Term:	Length
AGROVOC Term:	Body weight
AGROVOC Term:	Water temperature
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/7960

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