Posts tagged ‘Fish’

March 10, 2013

AquAdvantage Salmon

AquAdvantage salmon is the trade name for a genetically modified Atlantic salmon developed by AquaBounty Technologies. It has been modified by the addition of a growth hormone regulating gene from a Pacific Chinook salmon and a gene from an ocean pout (the Atlantic salmon has 40,000 genes). These additions enable it to grow year-round instead of only during spring and summer.

The purpose of the modifications is to increase the speed at which the fish grows, without affecting its ultimate size or other qualities, though conventional salmon growers have publicly challenged the purported fast growth rates of AquaBounty’s salmon. The fish grows to market size in 16 to 18 months rather than three years. The latter figure refers to varieties whose growth rate has already been improved by 2:1 as a result of traditional selective breeding.

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February 13, 2011

Tilapia

grilled tilapia

Tilapia [tuh-lah-pee-uh] is the common name for nearly a hundred species of fish. Tilapia inhabit a variety of fresh water habitats including shallow streams, ponds, rivers and lakes. Historically they have been of major importance in artisan fishing in Africa and the Middle East, and are of increasing importance in aquaculture. China is the largest Tilapia producer in the world, followed by Egypt.

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February 13, 2011

Escolar

escolar

The escolar [es-kuh-lahr] is a species of fish found in deep tropical and temperate waters around the world. It is also known as Snake Mackerel, and sometimes marketed as ‘butterfish,’ ‘oilfish,’ ‘white tuna,’ ‘walu,’ or ‘codfish,’ a controversial practice due to potential health problems related with consumption of the fish. Like its relative the oilfish, escolar cannot metabolize the wax esters naturally found in its diet. This gives the escolar an oil content of 14–25% in its flesh. These wax esters may cause gastrointestinal distress in humans called ‘steatorrhea,’ the onset of which may occur between 30 minutes and 36 hours following consumption.

Symptoms may include stomach cramps, bright orange oil in stool, diarrhea, headaches, nausea, vomiting, and anal leakage. Because of the possible effects of consumption, escolar has been banned from consumption in Japan since 1977, as the Japanese government considers it toxic. It has also been banned in Italy. In 1999, the Swedish and Danish National Food Administrations informed fish trade associations and fish importing companies about the problems escolar and related fish could cause if not prepared properly and issued recommendations.

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