Nov 16 2012

Intensive desert farming of marine fish in Egypt – Video

Video and information credit: Sherif Sadek (Egypt)            Description: Abdel Rahman El Gamal

Desert marine aquaculture in EgyptEven though the written text is in Arabic, the activities as shown in the video are clear and self-explained. The location of this project is in the desert whereas the underground water is the water source of the project. Underground water with 26 g/l salinity is the only water source. Fish species cultured are European seabass (Dicentrachus labrax) and gilthead seabream (Sparus aurata). The average fish production is about 20 kg/m3. In the present, the water discharged from the fish farm is used -on experimental basis- for farming three salt-tolerant plant crops that are namely salicornia, atriblex and sueda.  

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Permanent link to this article: https://fishconsult.org/?p=7317

Nov 15 2012

Cage farming of marine fish in Mauritius

Credit: Emrith Vinesh (Mauritius)

La Ferme Marine de Mahebourg (FMM) is a complex of cage farming and processing fish located in the lagoon of Vieux Grand Port in Mauritius.  The cages are extended on 1200 m2 in the lagoon.

The tropical climate and the winds and currents of the sea are key factors in for this type of aquaculture.

This cage complex consists of circular floating cages ranging in size from 8m, 16m and 20m in diameter with a depth of 5m to 8m. The circular cages that are adapted to tropical conditions and cyclone are placed to distribute biomass, depending on the currents, depth and type of substrate.

The species cultured are Channel Bass (Sciaenops ocellatus) and Goldlined Sea Bream (Rhabdosargus sarba).

The fish stock in the cages is fed at regular intervals during the day using feed supplied by internationally recognized suppliers. The feed is certified free from all artificial additives and genetically modified ingredients ensuring excellent quality of the fish.

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7301

Nov 15 2012

Fish aggregating devices and tuna fishery in Mauritus

Credit: Emrith Vinesh (Mauritius)
This structure shown in the photo which was introduced in 1985 is known as a Fish Aggregating Device. Fish aggregating devices (FADs) are floating objects that are specifically designed and located to attract tunas, and therefore allow fishers to find them more easily. 
The aim is to relocate the artisanal fishermen from the heavily exploited lagoon areas to the open sea, with a view to increasing their catch and concurrently reducing fishing pressure in the lagoon.
The Fish Aggregating Devices (FADs) designed in Mauritius is composed of reinforced plastic floats mounted on two strings of polyamide rope and moored to the sea bed with polypropy-lene rope. 27 FADs have been set around the island at distances of 3 to 10 nm from the shore and at depth ranging from 400 to 3 000 m.
Deep-water FADs attract or aggregate Skipjack (Katsuwonus pelamis), Yellowfin (Thunnus albacares), and Bigeye tunas (Thunnus obesus) and also sharks, Dolphin-fish, Rainbow-runner and other smaller fish.
No one understands exactly why tunas are attracted to FADs, but the ropes, floats and the other materials used presumably mimic the build-up of driftwood and seaweed found naturally in the sea.
Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7292

Nov 15 2012

Capture fishery practices and regulations in Mauritius

Credit:Emrith Vinesh (Mauritius)

The gear used for fishing is known as large net. This net has a maximum length of 500m and made up of square meshes measuring not less than 9 cm when stretched diagonally and when the net is wet (According to the Fisheries and Marine Resources Act)
It is prohibited to use the net between the 1st October in any year to the last day of February of the following year. These nets would be used between sunrise and sunset only. The twines of the yarn can either be 0.5mm nylon monofilaments or multifilament twine.  It is used in lagoons where the depths can vary between 1m and 6m.
The beginning of the net is preferably shot starting from a point on the beach or from the reef. When fishing in the middle of the sea, the net is shot from two pirogues moving apart slowly, shooting the pocket first.
Fish is driven into the net by the other boats, the fishermen on board beating the water surface with poles or knocking on the thwarts of their boat with sticks.

The main species caught are ‘Cordoniers’ (Siganus spp.), capitaines (Lethrinus spp.), Red mullet (Mullidae spp.) and Dame Berri (Lethrinus erythropterus).

The large net is very often used in conjunction with a ‘canard’ net which is specifically meant to capture mullets.
Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7270

Nov 14 2012

Display of finless sharks in Sharjah fish market (United Arab Emirates)

The photo shows the display of finless sharks in a retail shop in Sharjah fish market. Although, shark meat is consumed by human in variety of types (e.g. fresh, smoked, salted), shark fins are the most precious part of sharks which attain much higher monetary value in some Asian countries; China, Japan and Hong Kong in particular. Because of the high demand on shark fins in Asian countries, the missing fins in this photo must have gone through shark-fins trade to become a delicacy soup served in luxury restaurants and/or provided in special occasions. The monetary value of the meat is negligible and could be considered as by-products.

 

Permanent link to this article: https://fishconsult.org/?p=7256

Nov 14 2012

Les pratiques piscicoles en Côte d’Ivoire

Credit: M. Tan Doueu (Côte d’Ivoire)

les étangs: Pour l’élevage de Oreochromis niloticus et de Heterobranchus longifilis

les cages flottantes: Propices pour l’élevage de Oreochromis niloticus et de Oreochromis aureus

les enclos: Pour l’élevage de Chrysichthys nigrodigitatus et Heterobranchus longifilis

les “acadja “: Pour l’élevage de Chrysichthys nigrodigitatus, et de Oreochromis aureus

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7242

Nov 13 2012

Inland fishery and aquaculture in Thailand

Credit: Proyrat Chaowajaroenpong and Ong-art Kumprasert (Thailand)

The major inland water bodies available for freshwater fishery development and aquaculture include 66 rivers, 10,233 lakes, 685 reservoirs and man-made lakes. The total water surface of 566,400 ha. Fish catch from inland fishery amounted 230,000 tons in 2008 of the value of 710,000 U$.

Thai inland fishery plays an important role as a major source of animal protein for the rural people in the remote areas, particularly in the northern provinces. Major species caught from inland fishery include local carp, rohu, Nile tilapia, and catfish.

The popular species cultured in freshwater aquaculture include common silver barbs, (Barbodes gonionotus); Günther’s walking catfish, (Clarias  macrocephalus); Nile tilapia, (Oreochromis niloticus); Striped catfish, (Pangasianodon hypophthalmus); Mekong giant catfish (Pangasianodon gigas); and Giant freshwater prawn (Macrobrachium  rosenbergii).

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7235

Nov 13 2012

Culture of blue swimming crab, Portunus pelagicus in Thailand

Credit: Proyrat Chaowajaroenpong and Ong-art Kumprasert (Thailand)

The culture of blue swimming crab, Portunus pelagicus is carried out in earthen ponds. Appropriate water salinity for the blue swimming crab culture ranges from 20-30 g/l. Crabs are fed trash fish which is usually offered twice/day throughout the growing season that extends to about 6 months.  In the local Thai markets, the average market price is about 180 Baht/kg (about US$6/kg).

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7225

Nov 13 2012

The profile of shrimp culture in Thailand

Credit: Proyrat Chaowajaroenpong and Ong-art Kumprasert (Thailand)
According to the information available in 2011, the acreage under shrimp culture amounts 71,200 ha producing 400,000 – 500,000 tons of shrimp/year. There is approximately 30,000 shrimp farms; out of which 75% are small-scale operations. In the present, about 99% of produced shrimp belongs to whiteleg shrimp, Litopenaeus vannamei while only 1% of farmed shrimp belongs to black tiger shrimp, Penaeus monodon. There is about 300 HACCP-certified processing plants. Approximately, there is 1 million people working in shrimp sector.
Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7210

Nov 13 2012

Development of freshwater aquaculture in Myanmar

Credit: Zaw Zaw Htwe (Myanmar)

Myanmar’s fish culture has started in 1953 with imported Tilapia mossambica. By 1988, there were only 2550 hectares of fish ponds in the whole country. As fish was realized to be the stable diet for the people and one of the potential industry in the national economy of Myanmar, the State Peace and Development Council promulgated Aquaculture Law No. 24/89. Accordingly, the number of fish ponds in the whole country tremendously increased reaching more than 127000 hectares in 2000-2001. Freshwater prawn (Macrobrachium rosenbergii) is a key farmed freshwater organism. Earthen ponds represent the major source of aquaculture production whereas several species are farmed including rohu (Labeo rohita) which is the dominant fin-fish species in freshwater fish culture.  Most farmers follow polyculture system utilizing all stratum and natural food of pond water stocking major carps such as rohu, catla (Catla catla), mrigal (Cirrhinus mrigala), common carp (Cyprinus carpio), grass carp (Ctenopharyngodon idella), big head carp (Aristichthys nobilis), silver carp (Hypophthalmichthys molitrix), red tilapia (Tilapia mossambica x O. niloticus), hybrid catfish (Clarias gariepinus x Clarias macrocephalus), rohtee (Rohtee cortio), and stripped catfish (Pangasius sutchi).

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=7202

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