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Canadian Atlantic Cod
Canadian Atlantic Cod or ''Gadus morhua'', are cold water fish, which weigh 2 to 3 kg in the wild (). Atlantic Cod were originally found in the Atlantic Ocean, along the borders of both Canada and England and all the way down to the southern United States. Heavy fishing in these areas, in the late 1800s and early 1900s led to a massive decline in Cod population.() Today, they are grown in onshore temperature controlled, seawater tanks as eggs and eventually taken to sea cages when more developed.() The majority of these artificial environments found in Canada, are located in British Columbia, New Brunswick and as well as Newfoundland and Labrador. It takes about 6 months for the fish to hatch followed by a 2 to 3-year period for them to reach their maximize selling size, therefore taking an average of 3 years for a fish to reach market which is 3 to 5 kg.() According to Fisheries and Oceans Canada (2014) in 2013 1 kg of Cod was being sold for on average $7.12 fish.() Overall, Atlantic Cod are a relatively recent farmed fish, however are gaining popularity due to price, nutrition and feed to growth ratio.
==Raising Atlantic Cod==
In our modern society almost all fish, including Atlantic Cod, are now produced through aquaculture. Aquaculture is defined as “the rearing (raising) of aquatic animals or the cultivation of aquatic plants for food”. The raising of Atlantic Cod starts with the selection of the best female stock breed.() These fish are selected from previously grown market fish, located in off shore sea cages. They are selected based on weight; typically the heavier the fish the more eggs it can produce. The female fish are breed in onshore tank facilities and can produce 450,000 eggs per kg of body weight. After separating the females, the eggs are incubated in a temperature controlled tank for about 14 days until hatching. The baby cod or ‘larvae’ are then transferred to larval tanks. During this stage the larvae are feed yolk from a yolk sack for 3 to 4 days. After this period, once the larvae have grown large enough, they are fed tiny plank-tonic animals (grinded plankton). Then after a duration of 35 to 40 days of being fed plank-tonic animals, the larvae should have undergo metamorphosis and are now considered fish. They are removed from the larval tanks and put into circular tanks in an onshore facility. They remain in this stage for 6 months or until they are 10 to 20 grams or centimeters in length.() After they have reached this, size a microchip is sometimes inserted into the fish to monitor growth and collect information.() Finally the fish are taken to sea cage sites via industrial trucks and barges.() In the sea cages the Cod will grow until they reach market weight which can take 24 to 36 months. During that period all fish are fed, and cage sites cleaned on a daily basis to maintain the healthiest standards.()
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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