Effect of sperm ratio and temperature on fertilization and early larval development of the surf clam mesodesma donacium (bivalvia:mesodesmatidae)

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SUMMARY

    The success of fertilization depends on the sperm:oocyte ratio, where low concentrations of sperm reduce the probability of encounters with the oocyte, and a high concentration of sperm can increase the risk of polyspermy that generates an abnormal development of the embryos and affects the survival of larvae. Broodstock of Mesodesma donacium (n=93) of 63.77 ± 2.82 mm valvar length (anteroposterior axis) was obtained from a population in Cucao (42◦ 380 S; 74◦ 060 W) located on 3 of 12 To assess the effect of sperm concentration on fertilization, increasing proportions . . .

     

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