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Does the interrenal influence sex differentiation in sea bass, Dicentrarchus labrax?
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Sea bass Dicentrarchus labrax is one of the most important cultured species in Mediterranean aquaculture. This species remains sexually immature most of the first
year of life, and at the time of marketing (2 years old), females are 18-40% heavier than
males. However, in cultured populations, it is frequently reported skewed sex ratios in
favour of males (reaching 70-99%), and thus, the acquisition of all-female stocks is an
attractive option for sea bass aquaculture. The underlying hypothesis of this work is that
in intensive culture, the sea bass interrenal tissue produces corticosteroids in response to stress, and together with them an excess of adrenal androgens shifting the normal
androgen/ estrogen ratio and thus leading to gonadal masculinization. Thus, blocking
cortisol production with an antagonist (Dexamethasone) during the androgen sensitive
period would most likely decrease the androgen levels and thereby the sex ratios would
be altered.