How different are fecundation in osteichthyes and in chondrichthyes?

How different are fecundation in osteichthyes and in chondrichthyes?
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In chondrichthyes fecundation is internal by means of copulation. In osteichthyes fecundation generally is external and the gametes are released in the water, where they can fecundate their counterpart and form the zygote.
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