Jul 08 2015

Induction of spawning in gilthead seabream, Sparus aurata in Egypt (Video)

This video was filmed in a governmental marine hatchery located in Alexandria. The video begins with the out-door tanks of the broodstock showing their feeding activity then passing quickly by the indoor tanks. The spawning practices especially the egg sampling and the implanting of hormone capsule is shown in the end of the video.

Gilthead seabream is a batch spawner and can spawn daily over a long period during the spawning season. When the hormonal induction for the spawning of the species is determined, the use of slow release implants is adopted. The implant contains 100 microgram of GnRHa/kg of females that had oocyte diameters >530 micrometer. The implant is coated with a safe and high-efficiency polymer slow-release transitive system – 95 percent of cholesterol and 5 percent of cellulose.

As you may see in the video, an implanting gun is used for implanting the hormone capsule in the dorsal muscle of fish. Also, one will be able to see the wound treatment after implanting.

 

 

Permanent link to this article: https://fishconsult.org/?p=12779

Jul 07 2015

Construction of fishing vessels “Sambuks” in Yemen 

Photo credit: Tim Huntington (UK – Poseidon)

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

Sambuk construction in Yemen

 

 

The traditional fishing boats in Yemen are “houri” and “sambuks”. The inserted photo shows the construction of sambuks. Wooden vessels including sambuks are being built and repaired at private boatyards while cooperative workshops are used mainly for small repairs and maintenance. The growing scarcity and cost of timber traditionally used for boat building and repair may rationalize the attempts to use alternative materials. However, careful cooperation with fishermen is essential.

Sambuks are boats of 10–21 m in length powered by inboard diesel engines of 22–165 hp. Depending on the crew members range from 8-15 fishermen. Fishermen operating sambuks remain at sea for four to six days.

Various types of traditional fishing gears are used on sambuks including gillnet, hook and line and trawl nets whereas gillnets are mainly used for catching king fish and Indian mackerel. Hook and line is used to catch king fish, groupers, emperors and carangids while shrimp is the target of trawling operations.

It may worth mentioning to the fisheries loan program in Yemen that finances fishing boat construction and repairs, engines, and nets.

 

 

Permanent link to this article: https://fishconsult.org/?p=12777

Jul 06 2015

Display of farmed tilapia in a fish market in Lao PDR

Photo credit: Randall Bevis (In-Seine.org)

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

Tilapia display in a fish market in Laos

 

This photo was taken in Luang Nam Tha Province where some tilapia ponds exist and provide their harvest to local markets such as this one.

The people in the rural communities in Laos account for more than 75 per cent of the population. They depend upon on fish as their most reliable sources of animal protein. The estimated fish consumption in Laos from all fishery sources is about 29 kg/capita/year.

Aquaculture being one of the fishery resources is practiced in ponds, community fish culture in oxbow lakes and in irrigation weirs, rice-fish culture as well as in cages. Of particular importance, aquaculture in Lao PDR is able to provide fish during the dry season after the rains cease.

Common carp, tilapia, and African catfish are the main food fish which have been introduced and established their own breeding populations. The ability of tilapia to breed in the ponds enhances their popularity to fish farmers who rely on produced fingerlings for subsequent culture.

 

Permanent link to this article: https://fishconsult.org/?p=12769

Jul 04 2015

Controlled spawning of pike perch, (Sander lucioperca) in Poland

Credit: Roman Aszkiełowicz (Poland)

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

Pike perch 03 Pike perch 02 Pike perch 01

 

 

 

 

The hormone used in this given practice is the Human Chorionic Gonadotropin (HCG) using a single injection of 300IU/kg of female body weight (the dose can go up to 400 IU/kg). The hormonal application synchronizes the maturation process, and hence enhances the spawning effectiveness.

As shown in one of the images, the female has been anesthetized prior to stripping using etomidate.

The relative fecundity in pike perch is 170-230 eggs/g of body weight. Pike perch eggs are small with a diameter of 0.6-1.0 mm for unhardened eggs increasing to 0.0-1.6 mm for the hardened ones.

A 10-kg female produces around 2 – 2.2 million eggs which are fertilized by sperm taken from live males as done in this given case.

In order to remove the adhesiveness prior to incubation, eggs are placed in a tannin solution of 0.5-1.0 g/l of water for a period of 5 min.

Fertilized eggs are incubated in standard Weiss jars of a 7-l size furnished with bottom water supply of about 3 l/min. In fact, water supply is low at the beginning of egg incubation (0.5-1.0 l/min) while increases as incubation progresses reaching about 4.0 l/min). A typical 7-l Weiss jar can accommodate around 2 liters of eggs. The incubation period is determined according to the degree-day which is (80-120 °D) in pike perch and hence the incubation at 20 C as in the present case was 3.5 days ending by a hatchability of about was 90%.

The broodstock were caught from the wild whereas males reach sexual maturity at 2-3 years, while females require 3-4 years to reach their sexual maturity.

 

 

Permanent link to this article: https://fishconsult.org/?p=12762

Jun 30 2015

Développement de l’aquaculture à Richard-Toll (Senegal)- in French

Credit : Makhtar Ndiaye (Senegal)

Aquaculture promotion in Senegal (in French)

 

 

 

Dans le cadre du programme de relance des activités aquacoles, de sécurité alimentaire et de création d’emplois, mis en œuvre par la Direction Nationale de l’Aquaculture dans notre pays, un pisciculteur privé basé à Richard-Toll, a pu récolter plus de 2 tonnes de tilapia (espèces de poisson d’eau douce appelées communément waas en ouolof) élevées dans ses étangs aménagés sur une superficie de 3100 ha à Ndombo Alarba, un village de la communauté rurale de Mbane situé à quatre kilomètres de la capitale industrielle du fleuve.

 

 

Permanent link to this article: https://fishconsult.org/?p=12756

Jun 30 2015

Aquaculture development in Richard-Toll (Senegal)

Credit : Makhtar Ndiaye (Senegal)

Aquaculture promotion in Senegal (in French)

 

 

 

 

As part of the promotion program of aquaculture, food security and job creation in Senegal, implemented by the National Directorate of Aquaculture in Senegal. This inserted photo is taken in a private farm located in Richard Toll, whereas more than two tons of tilapia is being produced. Fish in these projects is raised in ponds constructed on an area of 3100 ha in Ndombo Alarba, a village in the rural community of Mbane located four kilometers from the industrial capital of river.

 

 

 

Permanent link to this article: https://fishconsult.org/?p=12759

Jun 30 2015

Closely watching the dolphins in the Sea World (San Diego) – Video

Source: www.fishconsult.org

This video was filmed in the Sea World, San Diego, California in San Diego.

This open water exhibit is nice stop at the Sea World which allows a close observation at dolphins and to watch the interaction between these magnificent animals with their trainers. I had the opportunity to see that during my visit the Sea World (San Diego) during December 2014. What a nice experience to be very close to dolphins, watching them while playing, feeding and interacting with trainers and guests.

If you are interested in more biological information on dolphins, you may wish to visit the following link on this channel: https://youtu.be/27lwFZYwnhI

 

Permanent link to this article: https://fishconsult.org/?p=12754

Jun 29 2015

African catfish in Brazil – 33-min Video

Source: www.fishconsult.org
Video credit: Juan Martin Canturin Garcia (Peru)
Review: Abdel Rahman El Gamal (Founder of the video channel and website)

African catfish, Clarias gariepinus was introduced from Africa to Brazil for aquaculture in 1986. However, the meat of catfish was not accepted well among consumers and hence the farming of the species is limited and its commercial farming could not develop as hoped. The recreational angling for the species has been practiced in ponds.

Reports mentioned that several hundreds of thousands of African catfish specimens have escaped from fish ponds and found their way to rivers and watersheds during floods in the upper Paraná watershed in 1996/1997. Consequently, it is believed that African catfish is found in almost all Brazilian watersheds. Reports highlighted severe ecological problems which are attributed to the introduction of this species especially the serious impacts of such predator on the restructuring of the native fish and invertebrate communities.

 

 

Permanent link to this article: https://fishconsult.org/?p=12752

Jun 29 2015

Enhancing the activities at the fish harbor, Karachi, Sindh (Pakistan)

Credit: Kanwal Odhejo (Pakistan)

Pakistan fishing harbor (01) Pakistan fishing harbor (02)

 

 

The inserted photos show some of the recent developments which have taken place at the fish harbor of Karachi, Pakistan. The developments included the lining of traditional fishing boats (e.g. Hora) with fiberglass and providing necessary protection against oil and grease. In addition to the installation of awning, overhead tank & wash basin, icing facility, etc. which were completed according to international standards.

The training has been an important component of the mentioned development through which crews were trained on the proper handling of marine food. In the same trend, required facilities and equipment were provided for proper landing and auctioning of fish in the fish market.

 

 

Permanent link to this article: https://fishconsult.org/?p=12747

Jun 26 2015

Processing, trade and consumption of dried fish in in Bangladesh

Credit for the photo and original description:Abu Sayed Talukder & Zahangir Alam (Bangladesh)

More information is provided by: Abdel Rahman El Gamal (Founder of the website)

Dried fish in Bangladesh

 

 

 

 

This photo has been taken at a dried fish market at a coastal area in Bangladesh. Most of dried fish displayed in the market are marine trash shrimp, knife fish (chhuri), Pomfret (rupchanda) and lottya.

Dried fish which is known in Bangladesh as “Shutki” is a popular food item in Bangladesh especially in the bay of Bengal area and is considered a main source of protein especially in areas such as Chittagong, Dhaka, Chandpur, Kuakata, Barisal etc. The production of dried fish provides livelihoods and incomes for large number of poor people. The high value and quality of dried fish are exported to where the demand exists for consumption by overseas Bangladeshis and East Asian markets.

Coastal areas in Bangladesh are famous for producing sun-dried fish which takes place from mid-October to mid-April. The drying of fish turns necessary in the light of the surplus fish catch in coastal areas, the inability to daily transport fish to where the demand on fresh fish might exist and the unfair prices usually offered by traders.

Fish dryers while attempting to minimize labor costs, they employ women and children as well as provide payment in kind.

During drying, fish dryers often use pesticides –based on their experience- to prevent maggot infestation and to achieve a long preservation for dried products. Although the use of pesticides is illegal, the practice continues to occur. More details on this matter could be found in scientific papers developed by Bangladeshi researchers.

 

 

 

Permanent link to this article: https://fishconsult.org/?p=12743

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