Aquaculture · 2026
Larval survival in European seabass (Dicentrarchus labrax) is shaped by the natural thermal regime of their population of origin and the level of introgression of Atlantic and Mediterranean genomes
Larval survival in European sea bass was followed under four thermal regimes: the natural temperatures of its three populations and a hatchery regime. The Atlantic and Eastern Mediterranean populations survive better at the temperatures of their home waters, and the higher the introgression between Atlantic and Mediterranean genomes, the lower the survival.
- The question
- Do temperature and genetic origin affect the survival of European sea bass larvae?
- The approach
- Larvae of the Atlantic (AT), Western Mediterranean (WM) and Eastern Mediterranean (EM) populations reared under four thermal regimes: three reflecting each population's natural temperatures and a typical hatchery regime.
- What the article brings
- Survival peaks around 13.6 °C for the Atlantic population, compared with above 17 °C for the Mediterranean populations; higher introgression lowers survival, which partly explains the poor performance of the Western Mediterranean population.
- The limits
- The authors link the introgression effect to purging of introgressed ancestry or to reproductive isolation barriers, and recommend considering it when establishing domesticated or selected lineages.
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