R. Wouters, C. Molina, P. Lavens, J. Calderon
A collection of samples of Penaeus vannamei wild broodstock and nauplii was gathered in the Esmeraldas Province, Ecuador in 1996 in order to determine the variation of the lipid and vitamin content in the hepatopancreas and the ovaries during the female sexual maturation and after the spawning process. The biochemical profile of the nauplii from wild broodstock, was also determined, in order to identify the components that are transferred in larger quantities, from the ovaries into the nauplii. Samples were taken from each of the maturation stages (0, I, II, III, IV and spawned females), carrying out analysis in triplicate on the gonadosomatic index, hepatosomatic index, humidity, total lipids, fatty acids, types of lipids, a-tocoferol (vitamine E), g-tocopherol (vitamin E) and vitamin C. The obtained data were statistically worked out and placed into graphics to facilitate its interpretation.
A selection of the main components and the ones that showed the greatest changes during ovary maturation, will be presented. This information will allow us to analyze the metabolic routes and the nutritional requirements of P. vannamei. broodstock. Likewise, the biochemical profiles will be compared with that of other species of shrimp and fresh feeds like Artemia biomass and polychaete from different origins.
(Fundacion CENAIM - ESPOL, Guayaquil, Ecuador)