The sperm has a dual function: activation of the oocyte and transmittance of paternal hereditary material. Sperms of teleosts have the simplest structure among fishes. The head is on average 2–3 microns long and the total length of the spermatozoon 40–60 microns ‘(Ginzburg, 1968)’. Sperm length of internally-fertilizing species is generally greater than that of externally-fertilizing species. In the latter, sperm length is positively related to number of ova but not to ovum size ‘(Stockley et al., 1996)’. Internally-fertilizing sperms are known as ‘intra-sperms’ while the term ‘aquasperm’ is used for sperm with an aquatic, free-swimming phase.
KeywordsMigration Aniline Neon Elon Pholis
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