Biometric parameters and biochemical composition of wild wreckfish (Polyprion americanus)
Linares, F.; Pérez-Rial, Evaristo; Rodríguez, J.L.; Pazos, G.; Álvarez-Blázquez, B. (Blanca)
Wreckfish (Polyprion americanus) is considered to be a good candidate for European
aquaculture. The main biometric parameters were recorded from 86 wild-caught fish (2.6-18
kg of total weight) for 14 months and the gonadosomatic index (GSI), hepatosomatic index
(HIS) and viscerosomatic index (VSI) were obtained. Biochemical analyses of muscle, liver
and gonads from wild wreckfish showed that wreckfish has a high level of protein in
muscle, 84% of dry weight (DW), and low level of lipids (7% DW). Capture season, sex, size
or weight of the fish did not have a strong effect on the variability observed in the levels of
proteins, lipids and fatty acids of the different tissues. Reared wreckfish have more lipids in
mature gonads than wild fish, which may be due to a more lipid-rich diet. However, some
polyunsaturated fatty acids (PUFA) such as arachidonic acid (ARA) and docosahexaenoic acid
(DHA) reached higher values in wild female gonads than in reared gonads, which could
indicate the wreckfish has high requirements in these fatty acids. This study obtained
valuable data on the biology and biochemical composition of wreckfish to estimate its
nutritional requirements, which could be useful for the future of this species in aquaculture.
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