May 18 2018

Shrimp eye-tagging

Photo credit: Andres Delgado (Colombia)

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

The inserted picture shows the eye-tagging of shrimp broodstock. This type of marking was found tolerable by shrimp especially large adult shrimp and is not lost during molting.

Eye tags are commonly used to mark adult marine shrimp in captive broodstock populations in hatcheries and/or in genetic breeding programs. The tag is made of plastic or metal and is numbered for identifying individual shrimp. The tag ring is placed on the eyestalk behind the bulbous of the eye.

 

Permanent link to this article: http://fishconsult.org/?p=14460

May 14 2018

Fish trapping during the early 1900s in Cook Islands – eel trap

Photo credit: New Zealand Museum (A permission has been granted to use this picture on this site)

This conical trap which has been known as “Inak” has a flat bottom and a narrow opening at the top. The trap is woven from the long thin coconut roots or the aerial roots of Freycinetia. The trap base is cross strengthened by two wooden strips. The construction of the trap allows easy removal of trapped fish. Usually, such traps are baited with small fish in order to effectively attract target fish especially eels and other larger fish species.

Such traps may have different shapes and sizes. According to the museum records, this particular trap dates back to 1907 and was made in Cook Islands with overall dimensions of 45 cm height and 69 cm diameter.

 

Permanent link to this article: http://fishconsult.org/?p=14451

May 13 2018

Cage culture of red tilapia in Vietnam – Video

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

Review: Abdel Rahman El Gamal (Founder of the video channel)

Tilapia culture in Vietnam usually targeted local markets before being exported to a large number in the USA and the European Union.

Red tilapia (Oreochromis spp.) is mainly cultured in floating cages as practiced in the Mekong Delta are made of wooden frames and nets. As the case with cages elsewhere, the ones shown in the video have the advantages of the relatively low capital investment, low operating costs, and easiness of their management.

Almost all cage farmers live on the site for most of the time. Depending on the farm size, the farmers may hire full-time employees, or use part-time workers.

Based on a recent survey, the average dimensions of a cage is 10 m length × 5 m width × 3.5 m depth.  Each cage is stocked by about 16,000 fingerlings of an average weight of about 4 g ranging from 1 to 10 g. The growing season takes about 5.5 months, allowing the production of two crops/year. Some cage farmers produce their own fingerlings while others depend on external resources. The harvested fish often has an average weight of about 700 g. During that grow-out period, fish are fed on pelleted feed.

In addition to cleaning the cages in-between the production cycles, fingerlings may be treated before stocking using baths of either salt, potassium permanganate (KMnO4), copper sulfate (CuSO4), or iodine.

In linkage with that, resource-poor farms such as the red tilapia cage farms are often at the risk of experiencing disease outbreaks and subsequent losses of production, income, and assets.

https://youtu.be/c_tqJD5vpM8

Permanent link to this article: http://fishconsult.org/?p=14447

May 10 2018

Climate change in Argentina (In Spanish)

A permission has been granted by the report owners to publish this report on this site

 

 

Climate change in Argentina

Permanent link to this article: http://fishconsult.org/?p=14443

May 10 2018

Climate change in Bolivia (In Spanish)

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

 

 

 

 

 

 

 

 

 

 

Climate change in Bolivia

Permanent link to this article: http://fishconsult.org/?p=14439

May 10 2018

Climate change in El Salvador (In Spanish)

A permission has been granted from the report owners to publish the report on this site

 

 

 

 

 

 

 

 

 

 

 

Climate change in El Salvador

 

Permanent link to this article: http://fishconsult.org/?p=14437

May 10 2018

Climate change in Chile (In Spanish)

A permission has been granted by the report owner for publishing this report on this site

 

 

 

Climate change in Chile

Permanent link to this article: http://fishconsult.org/?p=14433

May 10 2018

Climate change in Peru (in Spanish)

A permission has been granted by the report owners to publish this report on this site

 

 

 

 

 

 

 

 

 

 

 

 

Climate change in Peru

Permanent link to this article: http://fishconsult.org/?p=14429

May 10 2018

Climate change in Sri Lanka (2017)

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

 

 

 

 

 

 

 

 

 

 

 

Climate Change in Sri Lanka

 

 

 

Permanent link to this article: http://fishconsult.org/?p=14418

May 10 2018

Aquaculture development in Chad

Photo credit: Aliadoumadji Rimadoum (Chad)

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

 

The introduction of fish farming in Chad dates back to the 1970s. Since then, several types of farming have been introduced and tested whereas some positive results have been achieved in earthen pond systems especially when the cost of fish feed is not high and can be tolerated by farmers.

The promotion of aquaculture has been found necessary with a view to food security and the fight against poverty. The Aquaculture Development Directorate that was created in 2009 has taken into consideration some approaches towards the development of aquaculture activity including public/private partnership. It may worth noting that several international agencies, as well as cooperatives, have been engaged in the aquaculture development initiatives.

The inserted pictures have been taken during the practical training on the manufacturing on fish feed highlighting the possibility of the incorporation of locally available ingredients.

According to FAO statistics, the production from aquaculture in Chad first appeared in 2008 with 30 tons reaching its peak with 154 tons in 2015 before declining to 94 tons in 2016.

 

 

Permanent link to this article: http://fishconsult.org/?p=14414

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