Nov 07 2011
In many situations, axial flow pumps in fish farms have been found more suited for low heads and higher discharges which would ultimately enhance farm economics. Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture …
Permanent link to this article: https://fishconsult.org/?p=1230
Nov 07 2011
The most effective way of exchanging water is to first drain the desired amount of the water from the pond bottom. This effectively removes the poorest quality water and detritus which accumulates at the bottom of the pond. Note: We decided not to watermark the photos in order not to upset its clarity. However, we …
Permanent link to this article: https://fishconsult.org/?p=1226
Nov 07 2011
If a fish farmer has to choose whether filling or draining a fish pond by gravity, the choice usually is gravity draining. In general and wherever possible, the use of pumping systems in pond draining is not recommended keeping in mind that pond drainage often takes place while fish harvest and any failure in pumping system could lead to …
Permanent link to this article: https://fishconsult.org/?p=1220
Nov 07 2011
This project proposal has been developed by a group of trainees who participated in the Integrated Rural Development training course in 2009. This course is annually hosted by the Egyptian International Centre for Agriculture (EICA). This project proposal in its rationality and objectives focuses more on social issues such as employment and nutrition in rural …
Permanent link to this article: https://fishconsult.org/?p=1202
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
