Impact of sex ratio and stocking density on the induced spawning of the Egyptian sole (Solea aegyptiaca Chabanaud, 1927)
Saleh, H., Mohammed, R., Abou-Zied, R., Allam, S., Aljilany, S. (2016). Impact of sex ratio and stocking density on the induced spawning of the Egyptian sole (Solea aegyptiaca Chabanaud, 1927). EKB Journal Management System, 20(1), 59-75. doi: 10.21608/ejabf.2016.2287
Hamed Saleh; Ragab Mohammed; Ramadan Abou-Zied; Sobhy Allam; Safaa Aljilany. "Impact of sex ratio and stocking density on the induced spawning of the Egyptian sole (Solea aegyptiaca Chabanaud, 1927)". EKB Journal Management System, 20, 1, 2016, 59-75. doi: 10.21608/ejabf.2016.2287
Saleh, H., Mohammed, R., Abou-Zied, R., Allam, S., Aljilany, S. (2016). 'Impact of sex ratio and stocking density on the induced spawning of the Egyptian sole (Solea aegyptiaca Chabanaud, 1927)', EKB Journal Management System, 20(1), pp. 59-75. doi: 10.21608/ejabf.2016.2287
Saleh, H., Mohammed, R., Abou-Zied, R., Allam, S., Aljilany, S. Impact of sex ratio and stocking density on the induced spawning of the Egyptian sole (Solea aegyptiaca Chabanaud, 1927). EKB Journal Management System, 2016; 20(1): 59-75. doi: 10.21608/ejabf.2016.2287

Impact of sex ratio and stocking density on the induced spawning of the Egyptian sole (Solea aegyptiaca Chabanaud, 1927)

Egyptian Journal of Aquatic Biology and Fisheries
Article 6, Volume 20, Issue 1, January 2016, Page 59-75  XML PDF (265.11 K)
Document Type: Original Article
DOI: 10.21608/ejabf.2016.2287
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Authors
Hamed Saleh1; Ragab Mohammed1; Ramadan Abou-Zied2; Sobhy Allam2; Safaa Aljilany1
1National Institute of Oceanography and Fisheries (NIOF), Egypt
2Animal Production Department, Faculty of Agriculture, Fayoum University, Egypt.
Abstract
This study was conducted to evaluate the impact of sex ratio and stocking density on the induced spawning and reproductive performance of the Egyptian sole (Solea aegyptiaca) broodstock. Broodstock spawners were intermuscularly injected with Human Chorionic Gonadotropin Hormone (HCG) below the dorsal fine base; the dose was 7000 IU/Kg body weight of fish. In this study, three different broodstock sex ratios: 1:1, 1:2 and 2:1 (male ♂: female ♀) were tested. The highest fertilized eggs/ treatment and larvae/ treatment were observed in sex ratio (1♂:2♀). While, the highest fertilized eggs/ female, fertilized eggs/ g female, hatching rate and number of spawning were observed in sex ratio (2♂:1♀). Under the conditions tested in this study, larvae production of S. aegyptiaca was affected by different
broodstock sex ratios and improved at a sex ratio (1♂:2♀). Also, four different broodstock stocking densities: 0.5, 0.75, 1, 1.25 Kg/m3 were tested. The highest fertilized eggs/ treatment, fertilized eggs/ g female and larvae/ treatment were
observed in stocking density 0.75 Kg/m3 followed the other stocking densities. The lowest fertilized eggs/ female and/ g female were observed in stocking density 1.25 Kg/m3. Under the conditions tested in this study, larvae production of S. aegyptiaca was affected by different broodstock stocking densities and the best stocking density was 0.75 Kg/m3. Also, results demonstrated superiority of artificial spawnin compared to natural one. From the results of this study, it is recommended to use  artificial spawning in S. aegyptiaca with sex ratio (1♂:2♀) and stocking density (0.75 Kg/m3).
Keywords
Solea aegyptiaca; induced spawning; reproductive performance; sex ratio; stocking density
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