tailieunhanh - Manual on the Production and Use of Live Food for Aquaculture - Phần 7

Tài liệu mô tả chi tiết về kĩ thuật thức ăn tươi sống, phương pháp chế biến và cách cho thủy sản ănMong rằng sẽ giúp ích được cho các bạn. | Timing Day 1 - filter disinfect seawater 1 h aerate Day 2 9 00 start cysts disinfection 9 30 start hatching Day 3 9 30 harvest and start enrichment 18 00 add second enrichment Day 4 - 9 30 harvest QEIDj S Q . Tank production and use of ongrown Artemia . Nutritional properties of ongrown Artemia . Tank production . Literature of interest . Worksheets Jean Dhont and Patrick Lavens Laboratory of Aquaculture Artemia Reference Center University of Gent Belgium . Nutritional properties of ongrown Artemia The nutritional quality of Artemia biomass produced in semi-intensive or super-intensive systems is analogous to natural produced biomass except for the lipid content. The protein content of ongrown Artemia independent of its rearing conditions or food is appreciably higher than for instar I-nauplii Table . and is especially richer in essential amino acids Table . . On the other hand the lipid profile quantitatively Table . as well as qualitatively is variable and a reflection of the diet offered to the Artemia cultures. This does not necessarily restrict their application since high levels of essential fatty acids can easily and very quickly be attained in the Artemia biomass by applying simple bioencapsulation in less than one hour the digestive tract of the brine shrimp can be filled with a HUFA enrichment product boosting the n-3 HUFA content from a low level of 3 DW up to levels of more than 50 1 see . . Table . Comparison of the biochemical composition of Great Salt Lake nauplii and preadults harvested from superintensive culture systems. in after Léger et al. 1986 Artemia characteristics Proteins Lipids N-free extract Ash Instar-I nauplii - - - Cultured juveniles adults - - - - Wild adults - - - - Artemia juveniles and adults are used as a nursery diet not only for their optimal nutritional value but also .