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Aquaponics in Namibia

Photos credit: Kaulo Salushando (Namibia) – Review: Kaulo Salushando and Abdel Rahman El Gamal (Founder of the website)

The inserted pictures were taken in aquaponics project in Namibia. The project is located in Groot Aub, Khomas Region, Namibia. This project is suited inside a greenhouse. As shown inside the greenhouse, the fish pond is located under the bed of rocks where vegetable species are grown.

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Permanent link to this article: http://fishconsult.org/?p=14849

Spawning readiness of African catfish females – Video

Video credit: Ismael Radwan (Egypt) – Description: Abdel Rahman El Gamal (Founder of the video channel)

This short video shows a typical process carried out to checking process of the females of African catfish (Clarias gariepinus). This selection process is carried out towards successful spawning whether natural or artificial spawning. Two specimens have been checked in the video whereas the last one shows higher degree of readiness as eggs showed up at the reddish genital papilla under slight pressure on the swollen abdomen. The less ready females as the case with all species should be given enough time until reaching the ready-to-spawn stage.

Permanent link to this article: http://fishconsult.org/?p=14840

Use of red wiggler worms in aquaponics in Egypt (Video)

Red wiggler worms (Eisenia fetida) are known by its vermicomposting efficiency for organic wastes. Through such action, the red wiggler has been recommended for aquaponics not only because of its vermicomposting efficiency but also because of its low cost as well as its growing easiness whether on the aquaponics project itself or acquired from specialized farms.

Introducing healthy worms in sufficient numbers to the media bed in aquaponics would improve the decomposition of organic wastes including fish waste accumulating in the media/substrate based grow beds and hence while lowering the waste accumulation will allow more nutrients to become available to the plant crops in the system. In the present video, the red wiggler worms are cultured in a separate small greenhouse annexed to the aquaponics project.

Permanent link to this article: http://fishconsult.org/?p=14834

Enhancing the incoming water to a marine hatchery in Egypt

Photos credit: Marx Perfecto C. Garcia (Philippines)–   Review: Abdel Rahman El Gamal (Founder of the website)

The facilities shown in the inserted pictures have been constructed to enhance the water quality for the marine hatchery shown in the background. Suez Canal water is the main incoming water to the hatchery.

The concrete canals shown in one of the pictures serve to reduce the incoming turbidity through sedimentation while the sand filters serve to clear the water from the water load of suspended matters. There are ultraviolet units (UV) serve as sterilizers and located behind the sand filters. The whole unit is serving the weaning component of the hatchery. In regard to the larval culture tanks, special UV units are dedicated to further sterilize the water in the larval tanks. The species currently reproduced in the hatchery include gilthead seabream (Sparus aurata), European seabass (Dicentrachus labrax) and whiteleg shrimp (Litopenaeus vannamei). Depending on the market demand, more species have been reproduced earlier in this hatchery including soles and several marine shrimp species.

Permanent link to this article: http://fishconsult.org/?p=14830

An open hotel aquarium in Sharm El Sheikh (Egypt)

I filmed this video over few days during my stay in Sharm El Sheikh last March 2019. Like many of the hotel guests, I saw in this small and open aquarium an attractive point to stop at and watch the fish especially its location is in front of hotel restaurants. In order to provide some useful information from my side, I had to meet Eng. Samir and Mr. Hamdy Aziz from Stella Di Marie hotel then after I contacted Mr. Abdel Ghany Mohamed from Cairo (supplier of the ornamental fish).

This 7-year old aquarium received its founder batch of fish from a pet store in Cairo then subsequent batches were received from fish suppliers. Also, the koi fingerlings shown in the video indicates the reproduction of the species in the aquarium.

The main species hosted in this aquarium are Koi carp, fan tail, gold fish and black stomas. The largest specimens of koi belong to the original stock received about 7 years before.

The aquarium water is connected to a sand filter whereas back wash then flush takes place once daily then followed by rinsing for 2 minutes before the discharge goes to the drain that is connected with the drain of the swimming pools. I attended the daily feeding around noon and I have been told that the quantity of the pelleted feed is around 100 g of 2-mm size and 27% protein.

Permanent link to this article: http://fishconsult.org/?p=14825

Integrated poultry-tilapia in Togo

Photos credit: Asma Sabi (Togo) Description: Abdel Rahman El Gamal (Founder of the website). 

The inserted pictures are taken in fish farms in Togo. As typically practiced, the inserted pictures show the integration between tilapia cultured in earthen ponds and poultry grown in chicken house. The fallen manure as well as the uneaten chicken feed enrich the natural food underneath in tilapia pond and would be valuable in minimizing the need for commercial fish feed depending on the density of fish in the pond. In addition to the economic feasibility of this type of integration, the diversified farm products and so the periodic revenues would be reflected in the cash flow of the farm. 

Although the design of the poultry house may vary, the essential parameters such as space for each bird and the proper ventilation must be maintained whether the birds are broilers or layers. 

Permanent link to this article: http://fishconsult.org/?p=14823

Crocodile culture in China

Photo credit: Khamis killei John (South Sudan) – Review: Abdel Rahman El Gamal (Founder of the website)

The inserted pictures show specimens of crocodiles cultured in a crocodile farm. In this particular facility, the culture of crocodiles is done for research purposes.

It may worth noting that the possible escapee of crocodiles from the farms to the wild represented always environmental threats.

According to Wocomo Wild life, the largest crocodile farm in China hosts more than 5000 crocodiles and is located in Yunnan (Honghe Prefecture). In fact, the hot weather along with good water quality are supporting the farming of crocodiles in these regions.

In the beginning, crocodile farming which took place in China, Thailand, Cambodia and other countries targeted the trade of their skins which are the valuable products. Afterwards, crocodile meat began to be consumed and displayed in stores and offered in restaurants. In fact, China and Hong Kong are the main importers of crocodile meat. In addition to skin and meat, Other crocodile parts are also utilized as pharmaceuticals and in traditional medicines.

Permanent link to this article: http://fishconsult.org/?p=14819

Feeding gilthead seabream broodstock and pellet size (Video)

Video credit: Ahmed Shaheen – Review: Abdel Rahman El Gamal (Founder of the video channel)

The inserted video shows the feeding of gilthead seabream broodstock. The size of the feed pellet seems in a good match with the mouth opening of fed fish. Ideally, fish should be able to engulf the feed pellet at once. If the pellet size is larger than the mouth opening of fed fish, feed will be out of the direct consumption by the fish that have no choice except trying to get their feed requirement through biting. Doing so, a part of feed nutrients leaches in the water and get lost. Added to that, fish spend un-necessarily energy upon feeding. The same will be true when feeding a given size of fish on much smaller size pellets. Moreover, the cost of small-size pellets is usually higher than larger pellets. Therefore, if fish can easily consume a given size pellets, it is not advised to feed much larger or smaller size pellets.

Permanent link to this article: http://fishconsult.org/?p=14814

Ornamental fish industry in Guyana

Photo credit: Kevin Fitzsimmons (USA) – Review: Abdel Rahman El Gamal (Founder of the website)

The ornamental fish industry in Guyana even small but is relatively active. Live fish are caught in riverain areas and carried out by licensed collectors who use craft powered by outboard engines, and varying types of fishing gear (dragnets/seines, dipnets, pin-seines). Typically, the catch is sold to named exporters of ornamental fish whereas the fish are exported mainly to the U.S.A. as well as to Canada and Europe.  The main fish species caught and traded in Guyana include the “lemon fin”, the “busty nose” and “the “red tail pleco”. It may worth noting that in Guyana, the Iwokrama International Centre in partnership with the North Rupununi District Development Board has been working to develop a sustainable, community-based aquarium fisheries business in the Rupununi wetlands, central Guyana. The project has been designed to generate revenue for indigenous communities especially from the area’s extraordinarily high fish diversity.

Permanent link to this article: http://fishconsult.org/?p=14812

Production of all-male Nile tilapia fingerlings in Brazil – Video

Video credit: Elsadig Arbab (Sudan) – Description: Elsadig Arbab and Abdel Rahman El Gamal (Founder of the video channel)

The hatchery shown in the video is located in Toledo, San Jose (Brazil). This particular hatchery is a component of an aquaculture project that consists of around 1000 of small volume/high density cages (SVHD cages) of 1.5 meters for each of length, width and depth.

Tilapia reproduced in the hatchery is a genetically improved Thai strain of Nile tilapia (Oreochromis niloticus).

Two protocols of sex reversal have been adopted for the production of all-male tilapia fingerlings whether through feeding the newly swim-up tilapia fry on hormonal treated feed using the sex hormone (17 a-Methyltestosterone) orthrough the immersion of the newly hatched fry in hormone solution for 7 to 10 days. The actual fingerling production of the hatchery in 2014 is 5 million fingerlings produced during 8-month operation. However, the maximum capacity of the hatchery is 12 million fingerlings.

Permanent link to this article: http://fishconsult.org/?p=14806

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