Sexual maturation in the Mackerel Icefish, Champsocephalus gunnari, was studied by macroscopic examination of gonads. Evidence in support of the hypothesis that a proportion of mature fish fail to spawn was obtained. Histological examination of ovaries indicates that some ova were undergoing regression and resorption at least two months prior to the normal spawning date. It is concluded that the underlying cause is probably due to a shortage of krill, an important dietary item for Champsocephalus gunnari.
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