I will try to respond to the original comment and your later question.
Oyster eggs are food for corals.
Corals for which this food is particularly useful are those with poor prey capture responses and those with very small polyps. Included are Porites, Montipora, Goniopora, gorgonians, soft corals, and the oyster eggs even show some success with the maintenance of previously difficult or impossible to maintain azooxanthellate soft corals and seafans.
Oyster eggs are not food for clams. Clams consume a broad range of particles but primarily utilize phytoplankton.
Several studies have shown that bivalves will not effectively utilize preserved phytoplankton, or detritus. Studies have demonstrated that filterââ"šÂ¬Ã¢â‚¬Å“feeding mollusks are able to sort particles (Shumway et al., 1985). In 1998, Ward et al. have shown that both Crassostrea gigas and Mytilus trossulus are able to sort and ingest live microalgal cells, and selectively reject Spartina alterniflora, dried and crushed particles (3-20 Microns), as pseudofeces. Rejection of low quality particles in favor of higher quality microalgal cells has been previously demonstrated (Newell et al., 1989; Newell and Shumway, 1993).
Dennis Tagrin
DTââ"šÂ¬Ã¢"žÂ¢s Plankton Farm