Seasonal Variations in Gonadosomatic Index, Hepatosomatic Index, and Condition Factor of Metapenaeus affinis | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 75, Volume 29, Issue 1, January and February 2025, Page 1385-1392 PDF (372.33 K) | ||||
| DOI: 10.21608/ejabf.2025.410647 | ||||
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| Author | ||||
| Jabbar et al. | ||||
| Abstract | ||||
| Samples of Metapenaeus affinis were collected from the marine waters off the Iraqi coast between January 1 and December 1, 2022, to investigate the development of sexual maturity. Seasonal variations in gonadal function were observed in males, with peak rates (0.052) recorded in the summer and the lowest rates (0.024) in the winter. In females, the highest rates (0.979) occurred in spring, while the lowest (0.549) ones were observed in the winter. Liver function development was correlated with the stages of sexual maturity. In males, liver function was at its highest (0.234) in winter and lowest (0.108) in spring. In females, the highest liver function (0.404) was observed in fall, and the lowest (0.265) was in summer. The physical condition index also aligned with the stages of sexual maturity. In males, the highest values (13.789) were recorded in summer and the lowest (8.697) in spring. In females, the index peaked (9.499) in fall and was at its lowest (8.925) in winter. This study revealed that the shrimp exhibits a broad reproductive cycle. Statistical analyses showed that for females, the condition factor and liver function did not vary significantly across seasons. However, gonadal function exhibited significant differences between spring and the other seasons, with no significant differences between the remaining seasons. In males, the condition factor showed significant differences between summer and the other seasons, with no significant differences among the remaining seasons. Liver function showed significant variation between winter and the other seasons, with no differences among the rest. Regarding reproductive function, significant differences were observed between spring, summer, and fall, with no differences among those three seasons. | ||||
| Keywords | ||||
| Metapenaeus affinis; Marine waters; Seasonal variations; Gonadal function | ||||
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