Aquaculture · 2024
Post-larval exposure to warm temperature enhances female ratio, while starvation and photoperiod do not: The case of European seabass, Dicentrarchus labrax
Farmed European sea bass often produce a majority of males, while females grow faster and mature later. Two experiments test photoperiod, temperature and fasting: only a warmer post-larval temperature increases the proportion of females, from 30.4% at 19 °C to 48.7% at 25 °C.
- The question
- Do photoperiod, temperature and fasting change the sex ratio of farmed European sea bass?
- The approach
- Two experiments: two photoperiods until 90 days post-hatch at 16 °C, then four temperatures (19 to 25 °C) until 160 to 192 days; and fasting applied at four times during the sex-determination window, at 21 °C.
- What the article brings
- Neither photoperiod nor fasting changes the sex ratio; the proportion of females rises with post-larval temperature: 30.4% at 19 °C, 36.3% at 21 °C, 44.1% at 23 °C and 48.7% at 25 °C.
- The limits
- Results follow an initial cold treatment at 16 °C until 90 days; they offer a rearing lever to make up for the shortage of females, not full control of sex.
Figures from the article
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