کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2423746 | 1552929 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High DHA content in Artemia is ineffective to improve Octopus vulgaris paralarvae rearing
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
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چکیده انگلیسی
We analyzed the performance and biochemical composition of Octopus vulgaris paralarvae fed on three different diets, consisting of Artemia juveniles (1.5-2.8Â mm) differing in their highly unsaturated fatty acid (HUFA) composition and protein/lipid (P/L) ratio. The live prey were supplied twice a day at equal proportions, with the first daily meal being common to all groups: Artemia enriched with a mixture of the microalgae Rhodomonas lens and Isochrysis galbana (70:30 dry-weight basis). In the second daily meal, the control group (AR+I) was supplied with the same Artemia enriched with microalgae; group AGOLD was fed with Artemia enriched with Ori-Gold (Skretting), a commercial product very rich in docosahexaenoic acid (DHA, 22:6n-3); and group AGOPEL was fed with Artemia enriched with a manually prepared diet rich in protein and in HUFAs. A trend for better survival was observed in group AR+I at 25Â days of rearing, though no statistical differences were found among groups. The dry weight (DW) and total length (TL) of 15-day post hatch (dph) and 25-dph paralarvae from groups AR+I and AGOPEL were significantly higher than values found for paralarvae from AGOLD (PÂ <Â 0.05). A significant and positive linear correlation was found between paralarval DW and dietary protein/lipid ratio (PÂ <Â 0.01), while no beneficial effects of higher DHA content in Artemia were observed. Regarding the fatty acid (FA) composition of paralarvae, a remarkable drop in DHA was observed in all groups with respect to hatchlings. However, this decrease was more pronounced in paralarvae from AR+I (PÂ <Â 0.05) than in those from groups AGOLD and AGOPEL. Despite this evidence, the best growth and survival rates were observed in group AR+I, which was the only one where 35-dph paralarvae were attained. These data question the nutritional “essentiality” of DHA for paralarvae, and suggest that in order to sustain a good performance of paralarvae a minimum dietary P/L ratio should be attained before the HUFA composition of the diet may play a significant role.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquaculture - Volume 300, Issues 1â4, 27 February 2010, Pages 156-162
Journal: Aquaculture - Volume 300, Issues 1â4, 27 February 2010, Pages 156-162
نویسندگان
Pedro Seixas, Manuel Rey-Méndez, LuÃsa M.P. Valente, Ana Otero,