Dec 16 2016

Fish catch in Beni River (Bolivia)- Video

Video credit: Paola Luna Morales (Bolivia)

Review: Paola Luna Morales and Abdel Rahman El Gamal (Founder of the video channel)

 

 

fish-catch-in-beni-river-bolivia

It is common in the “Beni” river to see the fishermen on their boats with outboard motor while using their sacks to keep their catch of fish alive until they return to the nearest town to sell their catch; in this case to Rurrenabaque which is a small town lies on the east bank of the Beni River whereas fish constitutes an important part of the diet of the local population, especially in the wet season.

In this particular case, the captured species is a surubi (Pseudoplatystoma fasciatum) which is a nocturnal predator that feeds mainly on other fish and crabs (also known as barred catfish).

It may worth noting and based on research findings, there is a concern about the contamination of carnivorous fish caught in the Beni River and its tributaries with mercury resulting from the gold-mining activities which take place in the upper Beni River basin. However, as mining activities in this region are declining, many miners have turned to fishing as a livelihood.

 

 

 

 

Permanent link to this article: https://fishconsult.org/?p=13691

Dec 11 2016

Stock enhancement of threatened indigenous riverine fish species in Bangladesh

Photos’ credit: Abu Sayed Talukder and Zahangir Alam (Bangladesh)

Review: Abu Sayed Talukder and Abdel Rahman El Gamal (Founder of the website)

stock-enhancement-of-riverine-fish-in-bangladesh-02 stock-enhancement-of-riverine-fish-in-bangladesh-01

 

 

 

These particular pictures show the restocking practice in Ghagot River. The target of the restocking practice as the one seen in the attached pictures target is to promote small indigenous species especially those close to extinction. These species include threatened species such as snakeheads of the species (Channa punctatus), and (Channa striatus), climbing perch (Anabas testudineus), etc.

A study on fish ecology and production in 92 rivers of Rajshahi Division, revealed that there are variety of challenges are facing the rivers and so its fishery. These include siltation, erosion, low water flow, decreased depth and low fish production. The study cited that thirty one fish species have extinct from the rivers of Rajshahi division and 25 fish species are under threat of extinction during the time of the study (2003). It has been highlighted that because water flow in most study rivers decreases alarmingly especially in winter season, many rivers have silted up, consequently breeding and nursery grounds of most riverine fish species have decreased drastically.

 

 

Permanent link to this article: https://fishconsult.org/?p=13688

Dec 10 2016

Climate change in Sri Lanka

Owner of the report:: P.A.Madushanka (Sri Lanka)

climate-change-in-sri-lanka

http://fishconsult.org/wp-content/uploads/2016/12/Climate-change-in-Sri-Lanka.pdf

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

Permanent link to this article: https://fishconsult.org/?p=13680

Dec 08 2016

Fish culture Development training course- 2016 – International (prior to graduation)

 

eica-2016-prior-to-graduation-02 eica-2016-prior-to-graduation-01

 

 

The inserted group pictures were taken on two different dates with the most recent one (in front of EICA building) which was taken on December 07, 2016 (just a week before graduation).

This 75-day “Fish Culture Development” training course is being annually organized and supported since 1989 by the Egyptian International Centre for Agriculture (EICA) for trainees from Africa, Asia and Latin America. The participants in the 2016 course are:

Blaise Enochian Mahouanon  (Benin), Kelvin Raul Herbas Teran and Paola Luna Morales (Bolivia), Druk Pola (Bhutan), María Cristina Marín-Riffo (Chile), Dian Tugu Warsito Taufik (Indonesia), Farahiyah ilyana Jamaludin (Malaysia),  Viiav Manaar (Mauritius), Folani Asake Olayinka (Nigeria), Liz Mariela Martinez Ovelar (Paraguay), Italo Bardales Balarezo (Peru), Sidiga ali abdalrahman sam (Sudan), Ibrahim Musa Abdelwahab Ahamed (Sudan), Emad Mohammed Ahmed Mustafa (Sudan), Lopez Fernandez Nicolas Martin (Uruguay), and Mirian Judit Requena Gavidia (Venezuela).

It is always a pleasure to contribute to this course over its whole life span. The course will be concluded on December 15. While wishing all course participants safe flights back home, I always appreciate EICA management not only for giving me the chance to significantly contribute to the course but also for the chance to knowing wonderful teams of course participants year after another.   Abdel Rahman El Gamal

 

 

Permanent link to this article: https://fishconsult.org/?p=13676

Nov 29 2016

Development of tilapia aquaculture in Malaysia

 

Photos’ credit: Farahiyah ilyana Jamaludin (Malaysia)

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

tilapia-culture-in-malaysia

 

 

The inserted picture shows the culture of red tilapia in cement tanks in Terengganu, Malaysia. Red tilapia hybrid was introduced in 1980s and since then there has been a steadily increase in the contribution of tilapias to freshwater aquaculture in Malaysia.

According to national fishery statics, the production of Nile tilapia in 1992 was 3145 tons whereas the production of red tilapia amounted 1486 tons in the same year. As further development took place, tilapia production has been in favor of red tilapia as reflected in the fishery statistics whereas in 2011, red tilapia produced about 33,000 tons compared to about 9500 tons for normally pigmented tilapia. The market survey indicated that the average price of red tilapia is about 25% higher than normal tilapia.

In regard to farming environments, the cement tank tilapia culture represents only about 6% of total tilapia system whereas earthen ponds, ex-mining pools and floating cages produce 40%, 36% and 18% of farmed tilapia respectively.

 

 

Permanent link to this article: https://fishconsult.org/?p=13670

Nov 25 2016

Harvesting fish in a polyculture system in the Misiones Province (Argentina)- Video

Video credit: Herman Hennig (Argentina)

Review: Herman Hennig and Abdel Rahman El Gamal (Founder of the website and video channel)

harvesting-fish-in-argentine

 

 

The video which shows the fish harvest from a polyculture system was filmed in a fish farm located in Campo Viera, Misiones province (Northeast of Argentine). Fish species cultured in this particular farm includes carps, pacu (Piaractus mesopotamicus) and catfish.

According to the Aquaculture Directorate (2001), the Misiones province has been classified among the temperate warm and sub-tropical basin that is characterized by prolonged growing season. This basin has been found ideal for the culture of warm and temperate species, such as catfish, surubí, rollizo, bagre, cucharón, pirapitai or river salmon, bullfrog, Pacu, tilapia, Malaysian shrimp, red claw lobster, yacaré, ornamental fish and some invertebrate species.

It worth mentioning that there is small-scale aquaculture schemes in the Misiones province through which large numbers of small-scale rural producers have adopted fish farming as a means to improve their income.  Fish produced from these farms are usually sold in the local market.

Permanent link to this article: https://fishconsult.org/?p=13665

Nov 23 2016

زراعة أسماك البلطي والقراميط (القط) بولاية ورقلة فى الجزائر

Photo’s credit: Naim Belakri (Algeria)

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

culture-of-tilapia-and-catfish-in-algeria-02

 

 

 

تشير الصورة إلى مزرعة تقع فى ولاية ورقلة فى الجنوب الشرقى للجزائر والتى فيها يتم زراعة أسماك البلطى والقراميط (القط). تم استيراد البلطى النيلى من مصر بينما البلطى الأحمر هو نتاج هجين محلى. أما أسماك القراميط الأفريقية فلقد أمكن الحصول عليها من موارد محلية. المياه الجوفية من الآبار والتى هى مصدر المياه للمزرعة فإنها تتميز بالعذوبة لانخفاض ملوحتها. بوجه عام تتسم المياه الجوفية فى ولاية ورقلة بالوفرة.

ولما كان المناخ فى ولاية ورقلة صحراوي جاف بما يعنى ندرة الأمطار وكذا بفوارق حرارية كبيرة سواء كان ذلك بصفة يومية أو فصلية حيث ترتفع درجات الحرارة صيفا متجاوزة 40 مئوية على حين تنخفض كثيرا فى الشتاء ولاسيما ليلا حيث تصل الحرارة أدناها إلى حوالى الصفر مئوى أو حتى دون ذلك. ولهذا السبب فإن موسم التربية فى المزرعة يتركز فى فصل الصيف مع الوضع فى الاعتبار حساسية أسماك البلطى النيلى لبرودة المناخ فى الشتاء حتى ولو كانت المياة الجوفية دافئة.

يستخدم فى هذه المزرعة النمط المستطيل من الأحواض بأبعاد تقريبية 5 أمتار × 30 متر، كما يستخدم فى التربية أعلاف أسماك مستوردة من فرنسا.

جدير بالذكر أن أسماك البلطى تحظى حاليا بقبول المواطنين أما أسماك القط (القراميط) فإن إنتاجها والذى لا يزال تجريبيا فإنه ينم بيعه على هيئة شرائح (فيليه) كما يتم بيعه مطهيا فى مطعم تابع لصاحب المزرعة.

Permanent link to this article: https://fishconsult.org/?p=13622

Nov 07 2016

Conservation measures of golden mahaseer in Bhutan

Photo credit: Juie Claussen (FCF)

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

bhutan-radio-telemetry-02 bhutan-radio-telemetry-01

 

 

 

The golden mahaseer (Tor Putitora) is one of the highly prized sportfish in the rivers of the Himalayan region. The species is most attractive fish and may be considered as the ‘King of the Sport Fish’ in light of its aggressiveness as a sport fish bearing in mind it can grow to a length of about 2.7 meters and weigh up to 40 kg. The generation length of the species is close to 16 years.

Golden Mahaseer has undergone severe population declines in some areas of the world due to various reasons such as habitat loss and over-exploitation.

According to the International Union of Conservation (IUCN), among the various Mahaseer species, five are listed as “Endangered” and two as “Near Threatened” in the IUCN Red List of Threatened Species.

A stock enhancement program for the species has been developed through the establishment of golden mahaseer hatchery in Bhutan.

Moreover, and in an effort to determine effective conservation strategies and management plans of golden mahaseer, key biological and behavioral information was found needed including their reproduction and life history (spawning migration, grounds and time), their feeding grounds, the location of their overwintering grounds; and where the fish go during the monsoon season.  In order to acquire such information, a scientific remote radio telemetry study has launched with the cooperation between the Ministry of Agriculture and Forests in Bhutan (MoAF), World Wildlife Fund- Bhutan (WWF) and the Fisheries Conservation Foundation (FCF).

The ongoing remote radio telemetry study on golden mahaseer is underway in the two major arms of the Manas River, the Mangde Chhu and Dangme Chhu. The project includes the construction of receiver stations, capturing of Mahaseer using angling, surgically implant the captured fish with transmitters, manually track tagged Golden Mahaseer when possible and finally downloading the movement data from the receiver stations at the end of the trip. The inserted photos show some activities carried out in the radio telemetry study.

Reference: MoAF, WWF, and FCF, 2015. Using radio telemetry to study mahaseer movement in Bhutan. Project Report Submitted by: David Philipp and Julie Claussen (Fisheries Conservation Foundation).

 

 

 

Permanent link to this article: https://fishconsult.org/?p=13651

Nov 05 2016

Long-line culture of green mussel in Malaysia

Photos’ credit: Farahiyah ilyana Jamaludin (Malaysia)

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

green-mussel-culture-in-malaysia-02 green-mussel-culture-in-malaysia-01

 

 

The green mussel (Perna viridis) has a commercial importance and considered a good candidate for aquaculture because of its production characterizes especially its higher growth which enables reaching commercial sizes after a relatively short period of time. Moreover, the availability of its natural seeds has been a major asset encouraging the culture of the species. Added to that, their sturdy nature and resistant to catastrophic mass mortalities make it possible to produce large quantities of green mussel at reasonable prices. Their ability of using their byssus to attach to substrates makes the animals an ideal farmed species using different culture systems.

In Malaysia, the culture of green mussels showed a considerable potential in the coastal waters whereas the culture activity started in the Johore Straits –where the inserted pictures are taken-.  The strait of Johor is the largest producer of green mussels in Malaysia. Afterwards, the farming activities of green mussel spread to the western coast of Peninsular Malaysia.

The Longline green mussel farm comprises by parallel lines maintained near the water surface with buoys to which a series of vertical ropes are attached with intervals of about 50-70 cm and about 4 m space from the bottom. The vertical ropes provide grow out substrate to the mussels. The floats are anchored firmly to the bottom to keep the longlines on the surface of the water.

It may worth mentioning that the success of mussel culture in most parts of the world including the Johor strait (Indonesia) is confined to the availability of natural seed within the vicinity of the culture site. The same is true in regard to the availability of natural food and the rate of replenishment of the nutrients or phytoplankton by water current into the culture area.

 

 

Permanent link to this article: https://fishconsult.org/?p=13645

Oct 29 2016

Off-bottom culture of seaweed in the Alor Island (Indonesia)

Photos’ credit: Dian Tugu Warsito Taufik (Indonesia)

Review: Dian Tugu Warsito Taufik and Abdel Rahman El Gamal (Founder of the website)

culture-of-seaweed-in-alor-island-indonesia-02 culture-of-seaweed-in-alor-island-indonesia-01

 

 

Eucheuma cottonii is red seaweed that has a high economic value because of its contents of agar and carrageenan. Agar is widely used in food industry as a food additive, rehydrating food, a thickening agent, and viscosity controller while carrageenan is used as a stabilizer, thickener, suspending agent, and a gelling agent in food. Carrageenan is also used in non-food products such as toothpaste, cosmetics, paints, and textile dyes.

The inserted photos show the culture of seaweed (Eucheuma cottonii) in Alor Island using off-bottom method. The tools used in this method are stakes and line in which cuttings of seaweed are tied at to lines at 25 cm intervals. Additional rows are added about 1 m apart. The weight of the plant upon culture is about 50 g reaching a harvest weight of about 350 g after 40 days of culture to allow the crop to mature and increase its carrageenan content.  Harvesting is done through the uprooting of the plants. After harvesting the seaweed is dried before being sold, baled and sent for carrageenan extraction.

It may worth mentioning that Indonesia produces more than 20% of global production of Eucheuma Seaweed.

 

 

Permanent link to this article: https://fishconsult.org/?p=13638

Load more