Manque de naissain de moules pendant trois années consécutives dans les bouchots du Pertuis Breton. Observations préliminaires sur l'influence de la température et de l'ensoleillement

Arnong the last ye3Is, three years are pointed out by paar mussei's recruitment in the Pertuis Breton. This lack leJds ta a Strong decrease of lhe cultivateà biamass. The influences of temperature and sunshine were studied. The lemperature daes nal seem ta be a very important faclor. On the other hand, awing ta the technicals used in the Pertuis Breton an important sunshine correlated with a spring tide during seed settlement on ropes appears ta be a maj or factor in spatfall suceess. This hypothesis is strenghened by the fact that, during the period of study no recruitment failure were observed on the off- shore long lines.