Items under ownership of Abdel Rahman El Gamal, PhD
Nov 06 2011
The photo shows egg stripping which is a phase of the induced reproduction of African catfish (Clarias gariepinus). This female has been induced for spawning using the pituitary gland extract. The photo shows the egg stripping after the ovulation. Note how eggs are free flowing without clumps or blood. Eggs are obtained through stripping using soft …
Permanent link to this article: https://fishconsult.org/?p=1195
Nov 06 2011
Unlike many fish species, the sperm can only be obtained by sacrificing a male of African catfish (Clarias gariepinus). Testis is dissected and cut into small pieces whereas the milt used in egg fertilization will be obtained through pressing pieces of the testis out. Note: We decided not to watermark the photos in order not to upset …
Permanent link to this article: https://fishconsult.org/?p=1187
Nov 05 2011
Determining the spawning readiness of African catfish (Clarias gariepinus) female is assessed based on the softness of female abdomen as shown one photo. Female ovulation could be judged based on the release of few eggs under slight pressure. Females are watched for ovulation and should be stripped and eggs fertilized. Note: We decided not to watermark the photos …
Permanent link to this article: https://fishconsult.org/?p=1178
Nov 05 2011
Pituitary gland extract is used in induced reproduction of African catfish (Clarias gariepinus). In order for the pituitary extract to be effective, donor fish should be sexually mature whether male or female. Also, the extraction of pituitary gland is preferred to be close to or within the spawning season. Note: We decided not to watermark …
Permanent link to this article: https://fishconsult.org/?p=1171
Nov 05 2011
This photo shows clearly the projection of the male genital papilla of African catfish (Clarias gariepinus)
Permanent link to this article: https://fishconsult.org/?p=1161
Nov 05 2011
The photo shows how female African catfish (Clarias gariepinus) is identified based on the genital papilla (watch the reddish color of the papilla).
Permanent link to this article: https://fishconsult.org/?p=1155
Nov 05 2011
During the spawning season of Nile tilapia (Oreochromis niloticus) develop reddish coloration as secondary sex characteristics. One of the attached photos shows clearly the male coloration during the spawning season while the second photo shows the color difference between male and female of Nile tilapia. Note: We decided not to watermark the photos in order not to upset …
Permanent link to this article: https://fishconsult.org/?p=1143
Nov 05 2011
This integration approach has been adopted by some horticulture farms such as gouva and banana. Economic indications are promising. Fertile water when used in horticulture farm would reduced the demand for chemical fertilizers and hence improve the economics of the horticulture farm. In fact, if the right match between fish biomass and horticulture acreage, this …
Permanent link to this article: https://fishconsult.org/?p=1130
Nov 05 2011
Rotation concept has been practiced based on the nature of aquaculture and agriculture in a given region. Attached pictures show the farming of winter agricultural crops (e.g. wheat – alfalfa) in fish ponds. In temperate climates such as in Egypt, and in situations where Nile tilapia leads aquaculture cropping, fish harvest usually takes place before …
Permanent link to this article: https://fishconsult.org/?p=1122
Nov 05 2011
The compatibility between ducks and fish in such integrated system is of top importance bearing in mind that while ducks are warm blooded animals, fish are cold blooded animals. Therefore proper management should be in place including stocking times and rates. For example, when such integrated system is applied in warm water aquaculture in temperate countries, …
Permanent link to this article: https://fishconsult.org/?p=1101
