Credit: Rayner Pitt (United Kingdom)
This photo shows one of the first sandfish (Holothuria scabra) pens that were constructed in Vietnam. Upon the construction, it was thought the pen walls had to stand higher than the surface of the sea. Later it was realized that fences standing only about 50cm above the sea floor were sufficient to contain the animals (sea cucumber), which did not climb on this kind of netting. This of course made pen construction much cheaper and easier, and made much larger area pens possible.
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 is expected and will be appreciated.
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Permanent link to this article: https://fishconsult.org/?p=2440
This project proposal has been developed by a working group who participated in Fish Culture Development training course in 2011 under the supervision of Dr. Abdel Rahman El Gamal. The main focus of this project proposal is to enhance the productivity of striped catfish (Pangasianodon hypophthalmus) in Vietnam. The document highlighted the importance of the species in Vietnamese aquaculture especially in regard to fish export as well as in job creations and in enhancing the standards of living of poor communities in the Mekong Delta in Vietnam. The proposal has also addressed the technical and financial aspects of the project ending by a simple calculation of project profit. The project document is supported by illustrations.
[important]Intensification of striped catfish farming in Vietnam[/important]
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Permanent link to this article: https://fishconsult.org/?p=2858
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 wheel users, it is claimed that water wheels are efficient in lifting water and also more durable with less incidences of breakdowns and operation maintenance.
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Permanent link to this article: https://fishconsult.org/?p=2990
Credit: Eugene Eges (Uganda)
The photo shows the small silver minnow “Mukene”, Rastrineobola agentae whose biomass has gone up following the decline of Nile perch (Lates niloticus) stocks along with its predation pressure in Lake Victoria.
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 is expected and will be appreciated.
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Credit:Eugene Eges
Smoked Nile tilapia (Oreochromis niloticus) on a fish stall in Busia Fish market in Busia Uganda photo taken on 3dr Februery 2012 by Eugene Eges
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Credit: Kevin Fitzsimmons (USA)
Feeding compressed pellet diet in tilapia pond in Irriwaddy delta of Myanmar
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Credit: Kevin Fitzsimmons (USA)
Hand sorting of tilapia fry from eggs at hatchery in Irriwaddy delta of Myanmar
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Credit: Indian fish farmers and G. Venkata Raju (India)
Pond construction by manual labour has been stopped. Earth work is undertaken by bulldozers and tractors. Bulldozers are used in the case of large scale excavations whereas tractors are used for the projects requiring the earth work not more than 200 ha generally. However, finishing work will be done by using the tractors for the purpose of perfect slope for pond bottom and bunds.
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This video shows the feeding behavior of Nile tilapia (Oreochromis niloticus) whereas the feeding aggressiveness is obvious and will be always the case if fish are in good health and when the aquatic environment is close to optimum. This Tilapia has a small stomach and so would require a relatively long time to get its feed requirements and that is why dividing the daily ration into two (or more) feedings is usually practiced. In general and as the case of other fish species, the right match between the size of feed pellets and the mouth opening of fish is essential. In other words, if the smallest size of fish population can handle a 4-mm pellet, there is no reason to provide smaller pellets. Similarly, if the pellet size is beyond the ability of fish to ingest it, fish will have no choice but to bite the pellet which results in feed fines which is a form of feed waste.
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Credit of the video: El-Sadig Arbab Hagar (Sudan); description: Abdel Rahman El Gamal
Looking at the fish farm size in Egypt and so pond size, using the machinery in pond construction is the practical option. The intensification level of farming practices greatly influence the size of fish pond. A pond of a hectar or slightly less is commonly used in semi-intensive systems whereas larger size ponds are used in less intensive systems. In such large ponds, fish harvest represents a major task in regard to physical action and/or financial cost. Fish farmers in Egypt adopt the use of harvest ditch and manage fish harvesting in an efficient way using the ditch which could be in the middle of the pond or could surround the pond. In this system, seining is practiced while water depth is sufficient to perform seining. Afterwards, when pond water is drained properly, fish will follow the lowering water towards the ditch and fish will be effectively harvested effectively from the ditch. Harvest ditch helps in the drying of pond bottom and if a sort of treatment is required (e.g. disinfectants), the application will be restricted to limited area (the ditch).
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