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Fish sample populations for precocity and non-precocity. Precocious fish (empty circles) and non-precocious fish (full squares) were weighed and measured. Fish (25 of both precocious and non-precocious) were sampled on 15 Jan 2003. The difference in weight (using an unpaired t-test) and length (using a Mann Whitney test) in the two populations were both shown to be extremely significant (P < 0.0001).
