Effects of different food types on population growth and fatty acid composition of Copepods
Date Issued
2008
Date
2008
Author(s)
Hsu, Teng-Wei
Abstract
DHA and EPA are important fatty acids that essential for fish development and physiological function maintenance. The rich content of DHA and EPA in Copepoda enables it become an important living food of fish fry in aquaculture. Traditional outdoor and mixed culture of copepoda brings virus pathogens into fish fry culture pond easily. The high quality and high density culture of copepoda with no specific pathogens can be achieved by providing specific algae as food. However, the culture of algae needs intensive labor and large space, and is easily influenced by the competition of harmful biological organisms and climate. In order to cope with the problem, we tried to establish a pure culture system and design the food formula for copepoda to produce the living food for fish fry. Besides, we also compare the fatty acids composition difference between copepoda that fed with algae and other formula food. Apocyclops royi is a common copepoda found in aquaculture pond, so we use Tetraselmis chui and other formula food to culture Apocyclops royi for 13 days and observe its population changes. On the 14th day, the copepoda were collected and the fatty acids composition were analyzed. We found that the density of copepoda that fed with Tetraselmis chui is 23,100 per liter, and the DHA and EPA composition is 4.44% and 2.15% in total fatty acids, respectively. The density of copepoda that fed with shrimp chips is 3,750 per liter, and the DHA and EPA composition is 4.00% and 2.36% in total fatty acids, respectively. The density of copepoda that fed with formula food I is 5,475 per liter, and the DHA and EPA composition is 15.08% and 1.86% in total fatty acids, respectively. The density of copepoda that fed with formula food II is 6,700 per liter, and the DHA and EPA composition is 7.09% and 3.96% in total fatty acids, respectively. As far as production volume is concerned, algae are still the best food to produce Apocyclops royi. However, from the convenience point of view, formula food not only can save the cost and time of algae culture, but also can avoid the influence from climate and other pathogen contamination, and maintain a stable production. Besides, from the analysis results of fatty acid composition, copepoda fed with formula food I that contain highly α-linolenic acid has particular high DHA production in copepoda, which may imply that Apocyclops royi can turn α-linolenic acid into DHA.
Subjects
copepods
DHA
EPA
SDGs
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