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| Performance of Macrobrachium rosenbergii broodstock fed diets with different fatty acid composition |  |
| Cavalli, R.O.; Lavens, P.; Sorgeloos, P. (1999). Performance of Macrobrachium rosenbergii broodstock fed diets with different fatty acid composition Aquaculture 179: 387-402 |
| In: Aquaculture. Elsevier: Amsterdam. ISSN 0044-8486, meer |
| Ook gepubliceerd als |
- Cavalli, R.O.; Lavens, P.; Sorgeloos, P. (1999). Performance of Macrobrachium rosenbergii broodstock fed diets with different fatty acid composition, in: (1999). VLIZ Coll. Rep. 29(1999). VLIZ Collected Reprints: Marine and Coastal Research in Flanders, 29: pp. chapter 11 [Subsequent publication], meer
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| Trefwoorden |
Brood stocks; Fecundity; Feeding experiments; Polyunsaturated fatty acids; Prawn culture; Macrobrachium rosenbergii [WoRMS]; Marien |
| Abstract |
The effect of linoleic acid (18:2n-6) and n-3 highly unsaturated fatty acids (HUFA) on the reproductive performance and offspring quality of the freshwater prawn Macrobrachium rosenbergii was evaluated in a 180-day trial. Three isonitrogenous and isolipidic diets containing different levels of fatty acids, high 18:2n-6 and n-3 HUFA concentrations, high 18:2n-6 and low n-3 HUFA, and low 18:2n-6 and n-3 HUFA, were fed ad libitum to three groups of six females. Fecundity was improved by the addition of higher amounts of 18:2n-6 (from 3 to 13 mg g-1 DW). As a consequence of higher fecundity, smaller eggs were obtained most likely because the number of oocytes competing for a limited amount of yolk was higher. The higher gonado-somatic index of females fed diets with high levels of 18:2n-6 and n-3 HUFA levels further supports this hypothesis. The fatty acid composition of the eggs reflected to some extent the composition of the diets. Eggs of females fed high levels of 18:2n-6 and n-3 HUFA had the highest n-3 HUFA content and had increased hatchability. Eight-day-old larvae from females fed high levels of 18:2n-6 and n-3 HUFA tended to present a better stress tolerance when exposed to 100 mg l-1 total ammonia for 24 h. No other differences were detected among larval characteristics from the different offspring groups. Results demonstrate that feeding M. rosenbergii broodstock with high levels of 18:2n-6 and n-3 HUFA (13 and 15 mg g-1 DW, respectively) improved fecundity, egg hatchability, and the overall quality of the larvae. |
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