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ผู้เขียน หัวข้อ: What are aquaculture's limits?  (อ่าน 2110 ครั้ง)
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« เมื่อ: กรกฎาคม 31, 2010, 06:31:44 PM »


For aquaculture to be truly sustainable, carnivorous fish cannot be used (Photo: Terje Engoe)

What are aquaculture's limits?

WORLDWIDE
Friday, July 30, 2010, 23:50 (GMT + 9)



It is expected that this year could be the first in the history of humanity where more farmed than wild fish is consumed. In this context, it is important to note that for the future, only the production of species that do not require protein for development can evolve smoothly.
 
But only two groups would be in this category: 
Bivalves (mussels, clams, scallops, oysters, etc.). 
Vegetarian fish such as some types of tilapia. 
In principle, for the species included in both groups, production could be increased almost without limit.
 
By contrast, in the case of species whose diet requires animal protein (fish meal and oil), the growth of aquaculture will face problems in the future, despite the large feed producing companies trying to increase the proportion of soybean and reduce that of fishmeal.
 
But a carnivorous animal will always continue to be carnivorous. It is necessary to recall the negative background of the problem of mad cow disease, which made it clear that a non-vegetarian animal can be given a diet based on animal protein. The same principle of nature applies to a carnivorous fish, which can not be given a vegetarian diet without the risk of possible cases of "mad fish" disease.
 
<a href="http://www.youtube.com/watch?v=1_5AEIKl2vo" target="_blank">http://www.youtube.com/watch?v=1_5AEIKl2vo</a>
http://www.youtube.com/FishInfoServices

 
Tilapia is sustainable from the ecological point of view and its production cost is relatively low. In the U.S. market, its use has quadrupled between 2003 and 2006, and was ranked in fifth place among the most consumed by Americans, according to the National Marine Fisheries Service (NMFS).
 
The consumer guide from the Monterey Bay Aquarium (Consumer Guide to Ocean-friendly Fish) gives U.S. Tilapia the "best rating" and tilapia from Central America, a "good rating". However it recommends avoiding tilapia from China or Taiwan for the health hazard during its development.
 
95 per cent of tilapia consumed in the U.S. is of foreign origin, a figure which represents an increase of 17 per cent in the last five years.
 
Perhaps it is now time to inform consumers about the existence of "naturally sustainable" species or "vegetarian fish." At the same time, its production and consumption should be increased gradually, as it does not affect species currently used for processing fish meal, such as anchovy, jack mackerel or capelin, resources have almost reached the limits of exploitation and can not handle an increase in their catches.
 
By Michael Loubet
editorial@fis.com
www.fis.com
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