The lengths of newly hatched herring Clupea harengus larvae were generally larger than the lengths of embryos released from eggs on the same day. Over subsequent days, the daily increase in length was higher in groups that were released from the eggs as opposed to groups that hatched naturally. Thus by the end of the hatching period (18 days after fertilization) there were no significant differences in mean lengths.
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Audrey J. Geffen (2002) studied this question.
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