Abstract
Fertilization of the scallopPecten maximus occurs after gametes were naturally released in sea water by the bivalve which has undergone stimulation. The motility of the spermatozoa requires their dilution in sea water (1/40). Dilution triggers an immediate increase of oxygen consumption by sperm, reflecting an activation of a cyanide-sensitive respiration of a cellular origin. When scallops were stimulated by thermal shocks or by serotonin injection, sperm sampled at the urogenital pore output duct shows a respiration-motility activation after sea water dilution which is not seen in sperm scarified from the gonad. Dilution of kidney-sampled sperm into acidic (pH 5) or Na+-free artificial sea water reversibly inhibits both respiration and motility. In all cases fertilization rate of sperm is correlated to the increase of respiratory rate and motility measured after dilution in different media. Whether the scallop was stimulated or not, the pH of haemolymph and pericardic fluids were one pH unit below the value of sea water, the pH of the gonad and of the kidney tissues being more acidic (6.5 in average). Our results suggest that the acidic pH of the genital tract maintains the spermatozoa in a quiescent state and that capacitation occurs when male gametes move from the gonad to the kidney from where it is naturally released.
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