Sea Lettuce

Sea lettuce is a type of edible green algae found on coastlines worldwide. It is a popular food source in many countries, such as Japan, China, Ireland, and Great Britain. Commonly added to salads or soups, it is high in protein, fibre, and vitamins and minerals.
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Species Profile - Koi

Koi
Not all aquacultured fish are bred for food. Some, such as the Koi, or "brocaded carp", are bred for their ornamental qualities. Not technically a species, the koi is a domesticated variation of the common carp.

History
Koi breeding started in Japan in the 18th century. Rice farmers noticed that some carp were more colourful, and started to capture and raise them. The rest of the world was not aware until the early 20th century, by which time several colour patterns had been established. Koi quickly became extremely popular in Japan, and soon spread worldwide when advances in shipping made it possible to transport them safely.

Aquaculture
Koi are hardy, cold-water fish, benefiting from water between 15 and 25 degrees Celsius. Since their bright colours attract predators it is important that they are kept in ponds with deep areas, overhangs, and trees. Koi are omnivorous and can be fed anything from peas and lettuce to watermelons. When fed, they will recognize the person feeding them, and can be trained to eat from one's hand.

More Info:
http://www.koikeepers.com/
http://www.canadakoiclub.ca/site/
http://www.canadakoi.com/

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Bluefin Tuna

Bluefin Tuna can grow up to 3/4 of a tonne, and can swim at speeds reaching 50 km/h. However, they aren't beyond our reach. Bluefin fishermen use every resource available, including huge engines, spotter planes, and harpoons. Their migration routes are so predictable that fishermen know just where to catch them. In the Western Atlantic, since the mid 1970's, the bluefin population has declined by more than 85%. Scientists are calling for a total ban on fishing for bluefin, but many fishermen refuse to accept the fact that the populations are in danger at all.

Until fishermen realized that they could airlift these fish to Japan, bluefins were only worth a few cents a pound. Now, a single fish can sell for upwards of $25,000, occasionally going for more than $200,000 when the market fluctuates. The Japanese are by far the biggest importers of bluefin tuna in the world.

Japan is already a leader in aquaculture, and now they're even trying to raise bluefin tuna in captivity. Most farmed tuna are caught in the wild, then fattened up in ocean pens. Unfortunately, they are very sensitive to changes in water temperature and sunlight, and they need to be fed huge amounts of small fish, which would otherwise be a valuable protein source for the poorer people in Asia.

For now, tuna farming is only marginally better than catching them in the wild, environmentally speaking. However, methods are always improving, and hopefully technological and ecological capabilities will be developed to the point that it is truly sustainable.

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