Oct 02 2013

Semi-intensive culture of tilapia in Peru

Credit: Carlos Calderón Deza via: Wilder Rodriguez Arteaga (Peru)

In this production system, ponds of acreages from 0.5 to 3 acres are used with water exchange that ranges from 15 to 30% per day of the entire volume of the pond. In this system, aerators are used with aeration intensity that depends on the intensification level (ranges from 2-12 horse power/hectar).

The stocking densities used are highly variable and are in the range of 4 to 15 fish/m2 achieving fish production in the range of 20 to 50 tons/ ha/ year.

In this system is very important to monitor the levels of ammonia, pH, temperature and dissolved oxygen. In regard to fish feed, the extruded or pelleted feed is used with protein levels from 45 declining to 30% as fish grows.

Semi-intensive culture of tilapia in Peru

Permanent link to this article: https://fishconsult.org/?p=9422

Oct 02 2013

Cultivo Semi-Intensivo de tilapia en Perú (in Spanish)

Credit: Carlos Calderón Deza via: Wilder Rodriguez Arteaga (Peru)

En este sistema de producción se utilizan estanques de 0,5 a 3 hectáreas con recambios de agua del 15 al 30% diario de todo el volumen del estanque y se utilizan aireadores, dependiendo del grado de intensidad de siembra del sistema (se utilizan desde 2 HP a 12 HP por hectárea).

Las densidades utilizadas son muy variables y se encuentran en el rango de 4 a 15 peces/m2 obteniendo una producción en el rango de 20 a 50 tons/Ha/año.

En este sistema es muy importante el monitoreo de los niveles de amonio, pH, temperatura y el nivel de oxígeno disuelto.

Para la alimentación de los peces en este sistema se utiliza alimento peletizado o extruido, con niveles de proteína desde 30 a 45% de proteína dependiendo de la fase de producción.

Semi-intensive culture of tilapia in Peru

Permanent link to this article: https://fishconsult.org/?p=9416

Oct 01 2013

Culture of Nile tilapia, Oreochromis niloticus in Nicaragua

Credit: Silvio Rene Picado Ramirez (Nicaragua)

The introduction of Nile tilapia into Nicaragua goes back to 1956. However, the contribution of tilapia to aquaculture in Nicaragua was only felt during 1980s till the present. Different levels of intensification are practiced in Nicaragua. The photos show some practices in relation to the farming of tilapia in aquaculture in Nicaragua. These include fry handling, acclimation and a tilapia grow-out pond.

Culture of tilapia in Nicaragua (01) Culture of tilapia in Nicaragua (02) Culture of tilapia in Nicaragua (03)

 

Permanent link to this article: https://fishconsult.org/?p=9408

Sep 30 2013

Use of the phototactic behavior (attraction to light) in the collection of fish larvae

This single-slide bite address the utilization of the attraction of fish larvae to light to enable an efficient and safer collection of larvae.

http://fishconsult.org/wp-content/uploads/2013/09/Attracting-fish-larvae-to-light-for-their-collection.pdf

Permanent link to this article: https://fishconsult.org/?p=9403

Sep 29 2013

Culture of green mussel, Perna viridis in Thailand

Credit: Worawut Koedprang (Thailand)

The green mussel, Perna viridis is the most important species cultured along the coast of Thailand. It contributes around 62% (about 193,000 tons) of shell fish production and around 21% of total brackish water aquaculture production. At present, all seed used in green mussel aquaculture is naturally obtained. Green mussels are cultivated by extending the wing of the traditional bamboo stake trap, or staking bamboo poles, or coconut palm fronds into the muddy bottom at a depth of 4-8 meters to allow the mussel spats to settle on them. Several new techniques for culture mussel have recently been introduced. These are polyethylene rafts, longlines and racks.

Culture of green mussel in Thailand

 

 

Permanent link to this article: https://fishconsult.org/?p=9397

Sep 29 2013

Culture of blood cockle (Anadara sp.) in Thailand

Credit: Worawut Koedprang (Thailand)

Blood cockle contributes by around 27% (82,000 tons) of shell fish production and about 9% of total brackish water aquaculture production. For extensive culture, blood cockle seeds are collected from the wild, but since 1973, spats of Anadara granosa have been imported from Malaysia to overcome the shortage of natural supply and to promote the intensive culture system. The blood cockle is usually reared closed to the shore in estuarine areas with fine mud at the depths of 0.5-1 m. The cultivated area should not be exposed above sea level for more than 2-3 hours during low tide. For extensive systems, cockle spats of 0.3-0.5 g are collected from the natural seabed. The culture period is about two years. The photo shows the blood cockle species, Anadara nodifera.

Blood cockle in Thailand

 

Permanent link to this article: https://fishconsult.org/?p=9393

Sep 29 2013

Cage culture of grouper (Epinephelus sp.) in Thailand (Development and challenges)

Credit for the cage photo: Samart Detsathit (Thailand)

Credit for the species photo: Worawut Koedprang (Thailand)

Review: Samarat, Worawut and Abdel Rahman El Gamal

The culture of grouper in floating net cages is primarily undertaken in in the southern and eastern provinces of Thailand. The main species of cultured groupers are Epinephelus coioides and Epinephelus malabaricus.

Seeds are mainly collected from the wild as the fry produced through artificial are either insufficient or unstable. The insufficient supply of seeds of suitable size and quality is considered a limiting factor to the further growth of grouper farming. The stocking rates in cages vary significantly and could range from 20-100 fish/m2.

Cage farmers used to feed grouper on trash fish including yellow-stripe trivially, sardine or mackerel whether minced, chopped, cut or kept whole depending on the size of fish being fed. However, the artificial feed is available, but its price is seen expensive by many farmers.

In regard to growth rate, grouper could grow to 500 g within 7-8 month and could attain 1.2 kg within 12-14 months after stocking.

Because grouper culture has been placed high in the national plan, there are several research institutes working on grouper culture. The most prominent is the National Institute of Coastal Aquaculture (NICA) located in Songklha in southern Thailand.

 Grouper in Thailand Grouper cages in Thailand

 

Permanent link to this article: https://fishconsult.org/?p=9386

Sep 29 2013

Desove y Fecundacion de Conchas de Abanico en Peru (in Spanish)

Credit: Oswaldo Mayta Castellanos via Wilder Rodrìguez Arteaga (Peru)

Inducción del Desove:

Estimulación Térmica (variaciones escalonadas de temperatura)

 Estimulación Química (adición de gametos, adición de peroxido de hidrogeno, irradiación del agua de mar con UV, Serotonina, etc.) 

 Estimulación Mecánica (manipulación, exposición al aire, adicción de altas cantidades de microalgas, etc.).

 Spawning of scallops in Peru (01) Spawning of scallops in Peru (02) Spawning of scallops in Peru (03)

Permanent link to this article: https://fishconsult.org/?p=9379

Sep 28 2013

Arapaima (Arapaima gigas) as a promising species for Colombian aquaculture

Photo credit: Jaime Uribe and Lury Garcia (Colombia)

Review: Abdel Rahman El Gamal

The possible contribution of “arapaima” (Arapaima gigas) is based on its successful farming in some countries especially in Brazil. The farming of arapaima is done as a part of the conservation of the species or for commercial operations. The potential development of arapaima aquaculture is based on production and marketing characteristics including:

  • Perform well in fish ponds
  • Resistant to disease and tolerant to low dissolved oxygen (it has a modified and enlarged swim bladder able to breathe atmospheric oxygen)
  • High growth rate as considered as one of the world’s largest freshwater fish
  • Even carnivore, they could fed on foods and byproducts of low economic value
  • Enjoys high market demand and consumer acceptance and hence high commercial value
  • Yields value added by-products (scales, head, tongue and skin). For example, the its tongue is thought to have medicinal benefits in South America in regard to killing intestinal worms

Paiche (Arapaime gigas)

Permanent link to this article: https://fishconsult.org/?p=9372

Sep 28 2013

Rice-fish culture in Madagascar (development and outlook)

Photo credit: BE Jean Jacques

Review: Abdel Rahman El Gamal

The integration between rice and fish is an old practice in Madagascar that goes back to around 1900. The practice began with several fish species which are namely common carp (Cyprinus carpio), goldfish (Carassius auratus), and black diamond cichlid (Paratilapia pollen). Recently, tilapia is being integrated in the system. The adaptability of fish species to the rice system as well as the demand on these fish has been the main criteria in selecting these species. The photo shows a rice-tilapia field.

Because of the progress as well as the promising role of this system, the government of Madagascar is promoting such integrated system. The involvement of private sector proved to be essential in regard to overcoming the system obstacles such as the limitation of fish fry. The availability of about 900000 hectares of rice fields in Madagascar; out of which about 150,000 hectares of rice fields which could be suitable for rice-fish culture, the potential production of significant quantity of edible fish seems achievable.

Rice fish culture in Madagascar

 

 

Permanent link to this article: https://fishconsult.org/?p=9365

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