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]
Category: Experts
Describe an expert in the Fish Consulting Group
Permanent link to this article: https://fishconsult.org/?p=2336
Jan 20 2012
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 …
Permanent link to this article: https://fishconsult.org/?p=2289
Jan 20 2012
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 …
Permanent link to this article: https://fishconsult.org/?p=2275
Jan 15 2012
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 …
Permanent link to this article: https://fishconsult.org/?p=2268
Dec 26 2011
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 …
Permanent link to this article: https://fishconsult.org/?p=2154
Dec 26 2011
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 …
Permanent link to this article: https://fishconsult.org/?p=2147
Dec 25 2011
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 …
Permanent link to this article: https://fishconsult.org/?p=2124
Dec 17 2011
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
Dec 17 2011
Application of compensatory growth in fish
The role of fish hatchery is to produce healthy and high quality fry or fingerlings in sufficient numbers according to the operation plan of the hatchery. Therefore and in reference to the “compensatory growth” phenomenon in fish, hatcheries are not supposed to produce large-size fingerlinger on the cost of their number (unless economically justified). In …
Permanent link to this article: https://fishconsult.org/?p=2059
Dec 02 2011
Fish Culture Development training course (2011)
This 10-week training course is annually organized by the Egyptian International Centre for Agriculture (EICA). This year, the course started on the first of October and will last till the middle of December 2011. Dr. Abdel Rahman El Gamal contributes to the course with series of lectures as well as through the group projects. The 2011 course is …
Permanent link to this article: https://fishconsult.org/?p=1720