This presentation addresses the management of fish hatcheries starting with some information on fish reproduction in general. Before addressing artificial reproduction, natural collection of wild fry or post larvae have been covered. The presentation includes sexual maturation and broodstock management including maintenance and replacement. Examples and hatchery technologies and so requirements have been included. Various …
Category: Experts
Describe an expert in the Fish Consulting Group
Permanent link to this article: https://fishconsult.org/?p=1620
Nov 12 2011
Overwintering facility for gilthead seabream and European seabass (Italy)
Gilthead seabream (Sparus auratus) and European seabass (Dicentrachus labrachus) although can relatively tolerate low temperature, but cannot survive severe cold which could be encountered in Europe during winter and hence overwintering facilities may be required. The photo shows a high curtain surrounding the earthen pond where fish are overwintered. The curtains can be managed (folded or …
Permanent link to this article: https://fishconsult.org/?p=1437
Permanent link to this article: https://fishconsult.org/?p=1290
Nov 07 2011
Fish ponds enjoy gravity water
Topographic survey will be required to determine whether or not a given fish farm can enjoy gravity water. 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 or more. This will be appreciated. [important][/important]
Permanent link to this article: https://fishconsult.org/?p=1282
Nov 07 2011
Use of traditional water wheels in lifting water to fish farms in Egypt
Water wheels which were traditionally in use in agriculture are used in the present to lift water required to some fish farms in Egypt and some other countries. Based on water wheels users, it is claimed that water wheels are efficient in lifting water and also more durable with less incidences of breakdowns and operation maintenance. …
Permanent link to this article: https://fishconsult.org/?p=1276
Nov 07 2011
Axial flow pumps in fish farms (Egypt)
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
Bottom draining of fish pond water (Egypt)
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
Gravity draining of fish pond water
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 06 2011
Ovulation of African catfish (Clarias gariepinus) female
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
Induced reproduction of African catfish (Clarias gariepinus) and sacrificing the male
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