Category: A.A. EL GAMAL

Items under ownership of Abdel Rahman El Gamal, PhD

Enhancing fish hatchery practices – Extending solution (Ringer solution)

This single-slide information bite addresses facts related to fish sperm and its longivity. Enhancing the longivity as well as the fertilization of fish eggs is the focus of this bite. The composition and use of Ringer solution is covered in this breif. Also, the referigation of sperm solution. [important]Enhancing fish hatchery practices – Extending solutions[/important]

Permanent link to this article: https://fishconsult.org/?p=2355

Fish spawning induction – pituitary gland

This 3-slide information bite addresses the role of pituitary gland in the spawning induction. This topic addresses factors influence the effectivness of pituitary gland and the concentration of gonadotropic hormones. The collection and storage of pituitary glands have been addressed in the information bite. [important]Fish spawning induction – pituitary gland[/important]

Permanent link to this article: https://fishconsult.org/?p=2343

Economics of fish feeding

This information bite address fish feeding focusing on economics. Due to the economic law of dimenishing returns, ad libitum feeding is not recommended in commercial aquaculture. This information bite addresses the considerations of fry feeding as well as untraditional feed stuffs. [important]Economics of fish feeding[/important]  

Permanent link to this article: https://fishconsult.org/?p=2336

Force hatch of fish embryos

This information bite addresses the phenomenon of reluctant hatching of fish embryos. Hatch synchronization is always targeted in order to allow better hatchery management and reduce size differences among hatched larvae or fry. In this situation, force hatch approach could be adopted. This practice works directly on embryo’s hatching glands and its enzymes. Examples of …

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Permanent link to this article: https://fishconsult.org/?p=2289

Fertilization of fish eggs and quality of off-spring

This piece of information shows the practice of the sequentuial fertilization of fish egg is carried out by several males. The rationality of such practice as well as concerns have been highlighted. The drawback of such practice could be summarized in the overdominance of particular sperm over others which leads to lowering the effective breeding number …

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Permanent link to this article: https://fishconsult.org/?p=2275

Fish egg fertilization (illustrated)

This single slide shows the mechanism of egg fertilization in fish and some factors that could retard or enhance fertilization. This summary shows that blood clotting that could result of improper handling of female fish during eggs can close the very tiny opening that each egg has and known by micropyle preventing any entry of …

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Permanent link to this article: https://fishconsult.org/?p=2268

Artificial spawnining of African catfish, Clarias gariepinus (hormonal injection) – Video)

The video shows the injection of an African catfish (Clarias gariepinus) female. You may notice the small-medium size of female broodstock, the place of injection (dorsal part) and covering fish eyes as a means of calming. Anesthesia may be required especially in larger broodstock. Note: the credit of these video clips goes to colleagues who …

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Permanent link to this article: https://fishconsult.org/?p=2154

Sampling of Nile tilapia, Oreochromis niloticus in earthen ponds in Egypt (Video)

This video clip on sampling of Nile tilapia, Oreochromis niloticus shows clearly the morphological characteristics of a 300-400 g specimen of Nile tilapia especially the bands on the tail. Note: the credit of these video clips goes to colleagues who participated in aquaculture training courses organized by the Egyptian International Centre for Agriculture (EICA). I …

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Permanent link to this article: https://fishconsult.org/?p=2147

Final harvesting of Nile tilapia, Oreochromis niloticus in earthen ponds in Egypt (Video)

This video shows the last batch harvest of Nile tilapia (Oreochromis niloticus) in a medium size earthen pond (about 1-ha). For quality aspects, fish producers try their best to carry out most of tilapia harvest in 30-40 cm-water depth. However, regardless the fishing gears, there will be always left over tilapia in earthen ponds and …

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Permanent link to this article: https://fishconsult.org/?p=2124

Ploidy induction in fish

This information bytes address the induction of triplody and tetraploidy fish including reasons, procedures and ploidy identification. [important]Ploidy induction in fish[/important]

Permanent link to this article: https://fishconsult.org/?p=2065

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