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M. Osman et al., H. (2021). Reproductive biology of the Lessepsian migrant shrimp scad Alepes djedaba (Forsskal, 1775) from the Egyptian Mediterranean Sea coast.. Egyptian Journal of Aquatic Biology and Fisheries, 25(4), 401-415. doi: 10.21608/ejabf.2021.189953
Hanan M. Osman et al.. "Reproductive biology of the Lessepsian migrant shrimp scad Alepes djedaba (Forsskal, 1775) from the Egyptian Mediterranean Sea coast.". Egyptian Journal of Aquatic Biology and Fisheries, 25, 4, 2021, 401-415. doi: 10.21608/ejabf.2021.189953
M. Osman et al., H. (2021). 'Reproductive biology of the Lessepsian migrant shrimp scad Alepes djedaba (Forsskal, 1775) from the Egyptian Mediterranean Sea coast.', Egyptian Journal of Aquatic Biology and Fisheries, 25(4), pp. 401-415. doi: 10.21608/ejabf.2021.189953
M. Osman et al., H. Reproductive biology of the Lessepsian migrant shrimp scad Alepes djedaba (Forsskal, 1775) from the Egyptian Mediterranean Sea coast.. Egyptian Journal of Aquatic Biology and Fisheries, 2021; 25(4): 401-415. doi: 10.21608/ejabf.2021.189953

Reproductive biology of the Lessepsian migrant shrimp scad Alepes djedaba (Forsskal, 1775) from the Egyptian Mediterranean Sea coast.

Article 24, Volume 25, Issue 4, July and August 2021, Page 401-415  XML PDF (1.36 MB)
Document Type: Original Article
DOI: 10.21608/ejabf.2021.189953
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Author
Hanan M. Osman et al.
Abstract
The shrimp sacd, Alepes djedaba is a dominant species of genus Alepes in the purse seine catch of Damietta and Port Said landing sites on the Egyptian Mediterranean Sea. It represents a commercial species in Mediterranean Sea fisheries. A total of 718 specimens were collected from January to December 2019. The sex ratio M: F was 1.0:1.24 as the total sample contained 321 males and 397 females. The P-value of the chi-square test showed a highly significant difference between both sexes. Macroscopic and histological examination of gonads and monthly gonado-somatic index distribution revealed that A. djedaba has a prolonged spawning season extending from April to November with a peak during May. The lengths at first maturity were 16.0 and 16.7 cm for males and females respectively. A. djedaba is distinguished by high fecundity as the absolute fecundity ranged from 31680 to 336675 with an average of 134940.6 eggs and the relative fecundity ranged from 980.8 to 2683.9 with an average of 2152.2 oocytes g-1
Keywords
Shrimp scad; A. djedaba; Reproductive biology. Mediterranean Sea fishery
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