Feb 26 2012
Credit for the photos: El-Sadig Arbab Hagar (Sudan), Samuel Simon Zigizo (South Sudan) and David Martin Sykora (Paraguay). Credit for the technical information: Ismael Radwan (project owner, Kafr El Sheikh, Egypt) Photo A-1 shows the whole biological filter for a 240-m3 closed aquaculture project. Photo A-2 shows the plastic rings which are the main substrate …
Permanent link to this article: https://fishconsult.org/?p=2632
Dec 25 2011
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
Nov 17 2011
Mechanisms used in filtering water will depend on potential usage of water. This photo shows a type of gravel filters whereas filtered water is used in tilapia hatchery as well as for landscaping. This filter is located in 1000-m2 earthen pond. The filter is established above concrete base. The outer dimension of the filter is …
Permanent link to this article: https://fishconsult.org/?p=1501
Nov 14 2011
Fish harvest in earthen ponds is significantly facilitated by establishing harvest ditches. In addition to facilitating fish harvest, ditches help in drying pond bottom. Depending on pond size and the slope of pond bottom, placing harvest ditches are determined. Ditches could be peripheral especially in large ponds or central in smaller ponds. Establishing harvest ditches …
Permanent link to this article: https://fishconsult.org/?p=1468
Nov 13 2011
Fish harvesting in earthen ponds especially in large ponds is a significant task. Catch ponds are recommended to carry out efficient fish harvesting. For a 4-ha fish pond, a catch pond of the following dimensions will be sufficient; 2.5 m high, 10-m long, and 2-m wide. Catch pond should have a rocky bottom and sides. The …
Permanent link to this article: https://fishconsult.org/?p=1458
Nov 12 2011
This flexible system provide enough protection to Nile tilapia (Oreochromis niloticus) during cold weather in Egypt and in the same time allows fish to disperse in the pond and feed whenever weather gets warmer. Overwinter greenhouses are placed in earthen ponds whereas plastic covers go well below water surface but not reaching pond bottom. The area beneath greenhouses will …
Permanent link to this article: https://fishconsult.org/?p=1419
Nov 07 2011
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
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 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
