Aug 01 2015

Culture of green snail, Turbo marmoratus in Vanuatu

Image credit: Secretariat of the Pacific Community (SPC)

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

Culture of green snail

 

 

 

 

The resources of green snail (Turbo marmoratus) in Vanuatu are fished by small-scale commercial fishing activities. The estimated households that are engaged in the collection green snails reach about 2500. The green snail resources have been harvested mainly for export purposes since the beginning of the 19th century. The relatively recent assessment surveys for the resource indicated that green snail stocks have been exploited to near depletion.

In order to conserve the green snail stocks in Vanuatu, several management protocols have been applied including setting a minimum legal harvesting size of 15 cm basal length (diameter), placing a no-fishing taboo or green snails for a period of time and re-seeding with hatchery-produced juveniles. The inserted photo shows juvenile green snails produced at the Vanuatu hatchery.

 

 

Permanent link to this article: https://fishconsult.org/?p=12848

Jul 27 2015

Cage culture of tilapia in River Nile in Egypt – Video

This video was filmed during October 2014 in the River Nile, Damietta region.

Video credit: Willy Oviedo (Uruguay)

Nile cages

 

 

 

Typically, freshwater cages in Egypt has a surface area of 100m2 (10×10 m) with a depth of about 5 meters. Cage farmers gained enough experience in cage construction and management. The floats used in cages are barrels (plastic/metals), while the cage netting is made of double layers. Over the growing season, nets are changed with nets with larger mesh size the match the growing size of caged fish and to allow better water exchange. The production of the 500-m3 cage vary significantly from as low as three tons to ten tons or even more. Often commercial fish feed is used whether delivered manually or through fish feeders.

The cages in the same location have been judged illegal several years ago and have been already removed for the Nile due to problems related to environment and navigation concerns.

Afterwards, there have been different opinions regarding the coming back of cages but in a more controlled environmentally friendly cages. The use of silver carp instead of tilapia has been suggested as a friendly fish species which does not require commercial feed and hence less pollution to the hosting environment. However, because of marketing difficulty of silver carp, cage farmers could not give up tilapia, their favorite species. Nile tilapia, Oreochromis niloticus is the species farmed in cages.

Permanent link to this article: https://fishconsult.org/?p=12845

Jul 24 2015

Contact Us

For any questions or queries, please feel free to contact us :

Dr. Abdel Rahman El Gamal
Email: aaelgamal@gmail.com
Email: aelgamal@fishconsult.org

Website: www.fishconsult.org
Youtube: https://www.youtube.com/user/fishconsultgroup
Facebook: https://www.facebook.com/fishconsultgroup

 

Permanent link to this article: https://fishconsult.org/?p=12819

Jul 23 2015

Aquaculture and livelihoods in Ghana

Credit: Patrick Appenteng (Ghana)

aquaculture and livelihood in Ghana

 

 

 

The ultimate aim of aquaculture is to provide food security aside providing employment to people. This picture shows a little boy who had had his share of fish food from his mother degutting harvested fish from a fish farm in the Asuogyaman District of Ghana. This shows of course that aquaculture truly supports the livelihoods of most rural folks globally.

 

 

Permanent link to this article: https://fishconsult.org/?p=12814

Jul 20 2015

Seaweed farming in Solomon Islands

Image credit: Secretariat of the Pacific Community (SPC)

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

Seaweed farming in Solomon Islands

 

 

 

 

The first grow-out trial of seaweed farming in Solomon Islands was undertaken between 1988 and 1991 whereas Eucheuma sp. was grown off-bottom or at the fixed-depth method. The grazing pressure from herbivorous fish (e.g. rabbitfish) negatively affected the seaweed production in some sites. The red seaweed, Eucheuma sp. was introduced into Solomon Islands for the first time in 1988.

With the aid of a national seaweed project, a noticeable expansion in seaweed farming took place in several provinces in Solomon Islands resulting in preparing about 20 tons of dried seaweed for export in 2003. Through the national seaweed project, farmers were trained as well as the seaweed seed was distributed to beneficiaries from given communities such as Rarumana community and Waghena community. In general, the seaweed farming is oriented to export as no local markets do exist for the product.

The seaweed species farmed in Solomon Islands can be used for toothpaste, flavored-milk drink and pet food.

The seaweed farming in Solomon Islands is considered a growing industry based on the increasing number of farming sites as well as the active seaweed farmers who were estimated to be 250-300 farmers in 2011. The socio-economic benefits generated by seaweed farming are considered the key outcome of this activity.

The fluctuations in seaweed production in the past decade has been attributed to the low market prices, presence of fungal diseases and the tsunami of 2007 which destroyed key seaweed farms.

Note: the inserted photo shows the harvesting of seaweed in Rarumana (Solomon Islands)

 

 

Permanent link to this article: https://fishconsult.org/?p=12808

Jul 18 2015

Farming of marine shrimp in Fiji

Image credit: Secretariat of the Pacific Community

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

Preparation of a shrimp pond in Fiji

 

 

 

The inserted image shows the preparation of a shrimp pond in Fiji (liming). The following paragraphs review the development of farming of marine shrimp in Fiji.

The shortage in the supply of marine shrimp in Fiji compared to the demand is in favor of shrimp farming especially Fiji imports over 70% of shrimps (around 600 tons annually) from Australia and Solomon Islands for local consumption in particular for tourism. The estimated local supply of shrimp is less than 500 tons/year.

Even though the overall environmental and marketing situations are in favor of the potential production of high quality shrimp in Fiji, the progress towards that is not –so far- as hoped.

Then analysis of shrimp farming in Fiji highlighted the key factors hindering the development of shrimp culture which are topped by the shortage in the locally-produced shrimp post larvae and hence, the need to import the post larvae from overseas along with potential diseases accompanying the imported shrimp. The only shrimp hatchery is the one that belongs to Fisheries Department facility at Galoa, near Suva.

With the exception of the native shrimp species, Penaeus monodon, the imported species of broodstock and/or postlarvae include (Fenneropenaeus merguiensis, Fenneropenaeus indicus and Litopenaeus setiferus; Australia, New Caledonia, Solomon Islands, Hawaii and Brunei are the main sources of the non-native shrimp species.

 

 

Permanent link to this article: https://fishconsult.org/?p=12797

Jul 15 2015

Ombrage dans la culture commerciale de spirulines

Credit: spiruline-de-haute-saintonge.com/

Shading spirulina

 

La spiruline effectue le processus de photosynthèse, elle a donc besoin de périodes d’ombre et de lumière. Cependant c’est un micro-organisme et une exposition prolongée à certains rayonnement ultra-violets est dangereuse (phénomène de photolyse). Un système d’ombrages en protège donc la culture

 

Permanent link to this article: https://fishconsult.org/?p=12793

Jul 15 2015

Sexing tilapia based on genital papilla (Video)

This video shows the genital papilla in both sexes of large specimens of tilapia. The close view shows that in males the genital papilla has only one opening (the urinary pore of the ureter) through which both milt and urine pass while in females the eggs exit through a separate oviduct and only urine passes through the urinary pore. We understand that it is much easier to sex large specimens like the ones shown in the video, but for people who are not familiar with tilapia, it may be useful to clearly show the difference before applying it to much smaller sizes.

In general, during the breeding season, the genital papillae of both sexually mature fish become enlarged and turn easily distinguishable.

The sexing of advance fingerlings and/or tilapia juveniles might require some training and personal skills in order to carry out the sexing process with highest rate of accuracy.

Permanent link to this article: https://fishconsult.org/?p=12791

Jul 13 2015

Processing and consumption of smoked fish in Terekeka (South Sudan)

Photo credit: Trip down memory lane. blogspot

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

Smoked fish in Terekeka (South Sudan)

 

 

 

 

Fresh fish is prized by consumers in South Sudan. However, its high price keeps it beyond the reach of the average citizen and this becomes in favor of smoked fish which is very popular for South Sudanese consumers.

The instability and/or lacking of the public power supply necessitated the production of dried/smoked fish that enjoy the advantage of its long shelf-life under room temperature.

In the traditional fish smoking, firewood is used as fuel whereas smoking is done in earthen kilns located mainly in the landing sites off Terekeka along the Nile. The recent use of modern smokers “chorkor” is expected to improve the quality of the smoked product.

The inserted picture shows a Mundari fisherman carrying smoked fish in Terekeka bearing in mind that the Mundari people are main inhabitants of Terekeka County. One can also notice that large specimens of smoked large fish were split dorso-ventrally, and spread widely open, before being placed on the grid in the kiln.

 

 

Permanent link to this article: https://fishconsult.org/?p=12787

Jul 10 2015

Features of artisanal fishery in Lake Aheme (Benin)

Photos’ credit: Codjo Bertin Ahokin (Benin)

Review: Codjo Bertin Ahokin and Abdel Rahman El Gamal (Founder of the website)

Artisanal fishery in Lakes (Benin) 01 Artisanal fishery in Lakes (Benin) 02

 

 

Inland fishery is a very important activity for the riverside communities in regard to job creation and food security through providing a reliable source of animal protein. There are thousands of fishermen who depend on inland fishery in their livelihoods. In addition, there is a larger number of people who are involved in related activities such as fishing gear salesmen, dugout canoe manufacturers, as well as those employed in the trade, processing, and storage of the catch. Artisanal fishermen use small wooden canoes with paddles and/or sails.

Most of the shrimp catch in the in the southern lakes including Lake Aheme is exported to the EU market. This has called for infrastructure improvements of landing sites where certificated shrimp collectors of exporting firms can purchase shrimp from fishermen and handle it to meet the quality standards for export. One of the photos show a seine night fishing in Lake Ahémé while the second photo shows the purse seines while get dried over nearby trees after a fishing round.

 

 

Permanent link to this article: https://fishconsult.org/?p=12782

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