Data/hora: 11/06/2024 14:23:28

Provedor de dados: | 27
País: | Belgium
Título: | Performance of &lt;i&gt;Macrobrachium rosenbergii&lt;/i&gt; broodstock fed diets with different fatty acid composition
Autores: | Cavalli, R.O.; Lavens, P.; Sorgeloos, P.
Data: | 1999
Ano: | 1999
Palavras-chave: | Brood stocks; Fecundity; Feeding experiments; Polyunsaturated fatty acids; Prawn culture; Macrobrachium rosenbergii.
Resumo: | 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 &lt;i&gt;Macrobrachium rosenbergii&lt;/i&gt; 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&lt;sup&gt;-1&lt;/sup&gt; 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&lt;sup&gt;-1&lt;/sup&gt; total ammonia for 24 h. No other differences were detected among larval characteristics from the different offspring groups. Results demonstrate that feeding &lt;i&gt;M. rosenbergii&lt;/i&gt; broodstock with high levels of 18:2n-6 and n-3 HUFA (13 and 15 mg g&lt;sup&gt;-1&lt;/sup&gt; DW, respectively) improved fecundity, egg hatchability, and the overall quality of the larvae.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.vliz.be/nl/open-marien-archief?module=ref&refid=4006
Fonte: | %3Ci%3EAquaculture+179%3C%2Fi%3E%3A+387-402
Fonte: | info:eu-repo/semantics/restrictedAccess