Condition and energy allocation during the reproductive cycle of the Patagonian redfish Sebastes oculatus from the Argentine continental shelf
DOI:
https://doi.org/10.47193/mafis.3842025011002Keywords:
Reproduction, viviparity, body condition, energy densityAbstract
The Patagonian redfish (Sebastes oculatus Valenciennes 1833) is a viviparous species inhabiting the mid and outer shelf waters, as well as the rocky reefs along the Patagonian coast of Argentina. At present, the energy allocation strategy of this species during reproduction remains unknown. Thus, in this study, we analyzed the variations in biochemical and bioenergetic condition indices of adult females over a seasonal cycle. A total of 157 specimens were collected by onboard observers in commercial vessels between November 2016 and September 2017. The gonadosomatic index (GSI), morphophysiological condition (hepatosomatic index HSI and relative condition factor Kn), and the proximate composition (lipids, proteins, and moisture) along with energy density in muscle, liver, and gonads, were evaluated. Results showed an increase in lipid and protein reserves in the muscle and gonads during winter, coinciding with the onset of maturation. It was also observed that the energy density (kJ g-1) in the liver and muscle decreases in spring, coinciding with the greatest gonadal development (GSI). The highest energy density values in muscle were recorded during winter, which coincides with increased feeding activity of the species, suggesting a reproductive strategy closer to a ‘capital breeder’, with energy storage prior to the beginning of spawning.
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