Previous investigations of the bivalve Mya truncata in the Southern North Sea revealed the absence of the 1987 to 2001 y classes. Because the species' southern-most distribution limit is the southern North Sea, at the Frisian Front, we examined if M. truncata was reproductively active in this region. Histologic sections of reproductive tissues from individuals collected between June and April 2002 revealed synchronous gametogenesis with low numbers of vitellogenic oocytes. The low number of ripe oocytes may be one explanation for repeated recruitment failures of this species at this site.
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Vol. 24 • No. 1