Feb 13 2018

Culture of red tilapia in a biofloc system in Colombia – Video

Video credit: Marleyi Acuna Torres (Colombia)

Review: Marleyi Acuna Torres and Abdel Rahman El Gamal (Founder of the video channel)

 

 

 

 

 

This video was filmed in an aquaculture facility located in the north of Santander (Colombia). The project has an area of 3000 m2 where red tilapia is the cultured fish in a biofloc system.

The fingerlings of red tilapia with an average size of 0.5 g are stocked at a rate of 50 fingerlings/m2. After 6 months, fish are harvested with a harvestable size of about 350 g/fish. The project units allow the production of 4 tons of fish every 2 months. In addition to the biofloc, commercial feed is used in the project.

This particular project is financed by “Ibero-American Social Security Organization”- OISS to the key beneficiary as represented by the “APA association of Juan Frio” with the aim of supporting the victims of the armed conflicts. The project is technically managed by the APA association that provides also the training required to run the project.

Permanent link to this article: http://fishconsult.org/?p=14317

Jan 20 2018

Culture of Pacific oyster in Vietnam (Video)

Credit for the video and key information: DO Xuan Hai (Vietnam)

Review: Abdel Rahman El Gamal (Founder of the website)

Pacific oyster (Crassostrea gigas) was introduced into Vietnam from China and Australia in 2002 (for research/aquaculture). Several methods have been adopted in the culture of oyster in Vietnam.

Some of the cages shown in the inserted picture are used for finfish culture while oysters are cultured on ropes which are fastened to the bamboos above. The culture of Pacific oyster within marine finfish cages is a common practice as the nutrient-rich waters result from the finfish cages provide a nutrition base to oyster that feeds by filtration; grouper and cobia are the common fish species cultured in such cages. Water depth in this location is about 9 meters.

The major advantages of rope method include higher growth rate and better quality of produced oyster. This is in addition to higher survival rate due to the avoidance of bottom dwelling predators.

Farmers grow their oysters on recycled shells whereas each shell hosts three spats. Shells are placed to 1.5-m ropes which are fastened to the upper bamboos with about 50-cm intervals. The growing season of oysters in this region takes about 9 months from a spat to a commercially acceptable mollusk.

The culture of Pacific oyster takes place in several provinces including Halang Bay and Calaba Island. There is at least 10,000 low-income families do live in the Ha Long Bay area with the ability to adopt or diversify into oyster farming.

Because Vietnamese consumers readily accept and appreciate oysters, produced oysters are mainly marketed locally through oyster markets which are developing rapidly and allow to absorb the vast majority of oyster production. Export markets for Vietnamese oyster would always depend on quality assurance of produced oyster.

https://youtu.be/roW2QLIsGtk

Permanent link to this article: http://fishconsult.org/?p=14308

Jan 20 2018

Processing of sharks with zero waste – Oman

The inserted pictures show the processing of shark as carried out in a processing plant located in Wilayat Quiryat, Sultanate of Oman. The followings are the products and so the uses of different processed products.

Dried shark: As shown in the pictures, the shark meat is dried on screen rack. During drying, the meat is over-turned every day throughout the drying period which takes about 2 days in summer season extending to 5 days in winter. Dried shark is consumed mainly in the local market whereas the consumption is usually high during summer.

Shark fins: The shark fins are prepared for export to China where the demand on shark fins is significantly high and so its monetary value.

Dried shark skin: After drying the skin, it is packed to export to China

Liver oil: The oil is extracted from the shark liver and stored in regular barrels till sold. The liver oil is used to coat the hulls of wooden boats as a preservative against marine fouling.

Interestingly, whatever remained after the recovering the pre-mentioned parts/contents is not dumped. Instead, it is used as non-traditional fertilizer to the palm trees surrounding the processing establishment. In order to do that, a hole is dug close to the tree where a quantity of the remains is placed and water is added.

Shark processing and products (Oman)

 

Permanent link to this article: http://fishconsult.org/?p=14305

Jan 19 2018

Intensive culture of tilapia in aquaponic in Egypt – Video

The video was filmed in December 2014 in an aquaponics project located along Cairo-Alexandria Desert road in Egypt. These grow-out tanks are the component of a larger integrated and aquaponics project.

Nile tilapia, Oreochromis niloticus is the species cultured in this project. The aquaculture component consists of nursery and grow-out concrete tanks. The nursery tanks are rectangular with dimensions of 5.6 m width, 17.5 m length, and 2-m depth. The aeration is provided by air blower. The grow-out tanks have the dimension of 3 m width, 24 m length, and 2.2-meter depth. Aeration is provided by paddle wheel aerators; one 2-hp aerator for each tank. The feed used is commercial pelleted feed starting with 32% protein feed ending with 25% protein. The average production out of the grow-out tanks is 20 kg/m3 with an average size of about 350 g. The cardboard sheets shown in the video are imported and are of a special type that maintains its original shape in the water. These sheets are the biological filter in the present project.

The water is pumped in such closed system passing by the biological filters and reaching the aquaponics components whereas PVC pipes are installed in rows and where several types of vegetables are grown.

Underground water is the only water source. The original salinity of well water is 0.8 gram/liter. Because the water serves horticulture farm cultivated by grapes and mangos, the project installed a desalination station (not shown in the video) to bring the salinity down to 0.2 gram/liter as required by the horticulture trees.

Acknowledgment: I owe the project ownership and a management my sincere thanks for allowing me to visit the operation and post this video. Special thanks to Dr. Sherif Sadek who arranged this visit and for providing me with the technical information related to this project.

 

 

Permanent link to this article: http://fishconsult.org/?p=14294

Jan 18 2018

Farwa Fish Hatchery Complex in Libya

Photos credit: Abdallh Elmgawshi (Libya)

Review: Abdallh Elmgawshi and Abdel Rahman El Gamal (Founder of the website)

 

The inserted pictures have been taken at Farwa Fish Hatchery Complex sometime before 2011. The establishment of this hatchery complex targeted the development of marine aquaculture in Libya focusing mainly on the spawning and grow-out of gilthead seabream, Sparus aurata and European seabass (Dicentrachus labrax). The complex is located at Farwa lagoon the Tunisian border.

The Farwa complex started its activities in 2005 upon receiving eyed seabream eggs from Marine Biology Research Centre (MBRC) in Tajura along with importing seabream larvae from France.  As a result, about one-half million fry were distributed to farmers. In 2008 the Farwa Hatchery Complex produced seabass and gilthead seabream fry and distributed to farmers with low price. The broodstock of gilthead seabream was acquired from Ras El Helal farm, while European seabass broodstock was provided by MBRC.

The hatchery complex has been highly equipped with the overall construction and infrastructure having necessary equipment with optimum capacity along with standbys whenever applicable.  Hatchery facility included the spawning tanks, nursing tanks, natural food facility and others. The complex is also furnished with primary fattening concrete tanks equipped with a filtration system. Added to that, the facility has two floating cages with 12.5 m diameter and 2-m deep for final European seabass fattening. The supporting facilities and equipment serving such complex include wells, water pumps, power system, generators, oxygen pumps, desalination station, and others.

 

 

Permanent link to this article: http://fishconsult.org/?p=14292

Jan 17 2018

Intensive culture of red tilapia in biofloc system in Colombia

Photo credit: Marleyi Acuna Torres and Sandra Magally  Sanchez Trujillo (Colombia)

Review:  Marleyi Acuna Torres, Sandra Magally  Sanchez and Abdel Rahman El Gamal (Founder of the website)

 

This picture was taken in an aquaculture facility where red tilapia has been intensively cultured in a floc system in Ubicación,  Antioquia (Colombia). Based on studies carried out in several parts of the world, tilapia has been recommended for microbial floc (biofloc) operations because of their unique adaptation to thrive in biofloc system with better performance compared to common aquaculture fish species.

In line with the above, biofloc systems has been promoted in aquaculture as a low-cost system for producing high-quality fish at reducing the cost of formulated feed which ultimately keeps tilapia prices competitive with other farmed species.

Colombia is having the lead in red tilapia culture has experimented to biofloc system when stocked with Nile tilapia, red tilapia, and white cachama.

 

 

Permanent link to this article: http://fishconsult.org/?p=14287

Jan 17 2018

Surveying brown trout in natural waters of Astore District in (Pakistan)

Photo credit: Faridullah khan (Pakistan)

Review: Faridullah khan and Abdel Rahman El Gamal (Founder of the website)

 

 

The inserted picture was taken during a fishery survey done by fishery extension personnel affiliated to the Fishery Department in Astore District, Gilgit-Baltistan (Pakistan).

The brown trout (Salmo trutta) was introduced in Gilgit from Europe by political officers in 1916 whereas the climatic conditions in Gilget supported the self-reproducing of the species and became well-established in these northern parts of Pakistan. This species is now found in most of the rivers and lakes of Gilgit and Ghizer districts.

Gilget- Baltistan is highly mountainous and is known by some of the world’s highest mountains. Its  climate is characterized by the sharp weather variation from very hot to cold whereas the temperatures in the valleys including “Astore” as well as in some lakes (e.g. Rama Lake), are cold even in summer which may explain the establishing of brown trout (cold water fish) in this area.

It may worth noting that the brown trout is considered a major sport fishery for anglers in this region whereas trout fishing is usually listed on tourism packages.

 

Permanent link to this article: http://fishconsult.org/?p=14284

Jan 16 2018

Use of aeration in a red tilapia pond in Malaysia

Photo credit: Hanan Mohd Yusof (Malaysia)

Review: Hanan Mohd Yusof and Abdel Rahman El Gamal (Founder of the website)

The inserted picture shows the as carried out in a tilapia fish pond located at Felda Titi, Jelebu, Naegen, Seubilas, Malaysia. The aeration performed in this pond is known as “aero-tube system” which has been tried in this particular pond.

The system in this type of aeration is designed to create fine air bubbles throughout the aeration tubing. These bubbles rise-up slowly in the water column and because of its higher surface area, higher efficiency in oxygen transfer is achieved and so higher dissolved oxygen levels. It has been claimed that this technology leads to a significant reduction in the energy consumption and so the costs.

 

 

Permanent link to this article: http://fishconsult.org/?p=14279

Jan 13 2018

Rice-fish culture in Songea (Tanzania)

Credit: Jamila Ibrahim and Lucka Paschal (Tanzania)

 

The inserted picture is for an integrated agriculture-aquaculture system carried out in Songea, Ruvuma,  Tanzania. The acreage of the rice field is about one hectar while the harvest amounts about four tons of rice and 100 kg of tilapia which is commonly used in such integrated system.

 

 

Permanent link to this article: http://fishconsult.org/?p=14275

Jan 12 2018

Climate change in Kenya

A permission from the report owners has been granted for publishing the report on this site

 

Climate Change in Kenya

 

 

Permanent link to this article: http://fishconsult.org/?p=14272

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