Jan 02 2012

Farming of salmon (Atlantic and coho) and rainbow trout in off-shore cages in Chile

Credit: Gabriel Salvo (Chile)

These two photos illustrate models of off-shore cages. Such cages could be square with approximate dimension of 15-30 meter per side and circular cages with diameters that range from 15-30 meters. Depth of cages ranges from 10-30 meters.

The principal species farmed in these cages are  Atlantic salmon, Salmo salar, Coho salmon, Oncorhynchus kisutch and rainbow trout, Oncorhynchus mykiss. The growing season starts during winter-spring and lasts for 14-16 months for the first species and 8-12 months for the two other species. Average weight upon harvest is largely determined by market demand and ranges from 4-5 kg for Atlntic salmon and 2.8-3.2 kg for the other two species.

Depending on farmed species and cage size as well as stocking density and length of growing season, harvested weight of about 240-280 tons of Salmo salar per cage is a good estimate. Cage productivity may range from 140-190 tons for coho salmon and 140-320 tons for rainbow trout.

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=2172

Jan 01 2012

Cage farming of salmon (Atlantic, coho, king), or rainbow trout in Chile

Credit: Gabriel Salvo (Chile)

The photo shows a model of cage farming in Chile. Depending on water bodies and quality, the principal species produced in cages in Chile are Atlantic Salmon (Salmo salar), Coho Salmon (Oncorhynchus kisutch), King Salmon (Oncorhynchus tshawytscha) and Rainbow Trout (Oncorhynchus mykiss). Monoculture is the only system practiced in cage farming in Chile.

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=2161

Dec 26 2011

Artificial spawnining of African catfish, Clarias gariepinus (hormonal injection) – Video)

The video shows the injection of an African catfish (Clarias gariepinus) female. You may notice the small-medium size of female broodstock, the place of injection (dorsal part) and covering fish eyes as a means of calming. Anesthesia may be required especially in larger broodstock.

Note: the credit of these video clips goes to colleagues who participated in aquaculture training courses organized by the Egyptian International Centre for Agriculture (EICA). I am trying to identify the colleagues who donated me these clips and I will personalize the credits if I am successful in my attempt.

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Permanent link to this article: https://fishconsult.org/?p=2154

Dec 26 2011

Sampling of Nile tilapia, Oreochromis niloticus in earthen ponds in Egypt (Video)

This video clip on sampling of Nile tilapia, Oreochromis niloticus shows clearly the morphological characteristics of a 300-400 g specimen of Nile tilapia especially the bands on the tail.

Note: the credit of these video clips goes to colleagues who participated in aquaculture training courses organized by the Egyptian International Centre for Agriculture (EICA). I am trying to identify the colleagues who donated me these clips and I will personalize the credits if I am successful in my attempt.

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Permanent link to this article: https://fishconsult.org/?p=2147

Dec 25 2011

Final harvesting of Nile tilapia, Oreochromis niloticus in earthen ponds in Egypt (Video)

This video shows the last batch harvest of Nile tilapia (Oreochromis niloticus) in a medium size earthen pond (about 1-ha). For quality aspects, fish producers try their best to carry out most of tilapia harvest in 30-40 cm-water depth. However, regardless the fishing gears, there will be always left over tilapia in earthen ponds and should be harvested before declaring a complete harvest. The video shows harvesting tilapia from a drained pond while allowing water to attract fish into the harvest zone.

Note: the credit of these video clips goes to colleagues who participated in aquaculture training courses organized by the Egyptian International Centre for Agriculture (EICA). I am trying to identify the colleagues who donated me these clips and I will personalize the credits if I am successful in my attempt.

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Permanent link to this article: https://fishconsult.org/?p=2124

Dec 20 2011

Sea cucumber – Storage of sand fish (Holothuria scabra) broodstock

Credit: Rayner Pitt (United Kingdom)

Sand fish (Holothuria scabra) Broodstock storage in sea pens and cages, in lobster farming area (2001).

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=2118

Dec 20 2011

Sea cucumber – nursery of sand fish (Holothuria scabra)

Credit: Rayner Pitt (United Kingdom)

Sorting small batches of sandfish (Holothuria scabra) juveniles for nursery rearing experiments in outdoor tanks (2002).

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=2110

Dec 20 2011

Sea cucumber – Breeding of sand fish (Holothuria scabra)

Credit: Rayner Pitt (United Kingdom):

Wild-caught sandfish stored and on-grown in a farmer’s pond before being used for breeding experiments (2000).

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=2103

Dec 17 2011

Ploidy induction in fish

This information bytes address the induction of triplody and tetraploidy fish including reasons, procedures and ploidy identification.

[important]Ploidy induction in fish[/important]

Permanent link to this article: https://fishconsult.org/?p=2065

Dec 17 2011

Application of compensatory growth in fish

The role of fish hatchery is to produce healthy and high quality fry or fingerlings in sufficient numbers according to the operation plan of the hatchery. Therefore and in reference to the “compensatory growth” phenomenon in fish, hatcheries are not supposed to produce large-size fingerlinger on the cost of their number (unless economically justified). In grow-out on fish farms, hatchery-produced normal size fry or fingerlingrlings are expected to show exceptional grow rate compared to their larger-size counterparts of fingerlings and over time, the will be able to make up the deficit in average weight and hence minimizing initial benifit of producing unnecessarily large-size fingerlings on the cost of larger numbers of healthy even smaller size fingerlings.

[important]Compensatory growth[/important]

Permanent link to this article: https://fishconsult.org/?p=2059

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