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Title: Sexual Dimorphism in the Labrid Fish Pseudolabrus celidotus (Bloch and Schneider) 1801 
Author: Choat, J.H.
Date: 1965-10
Publisher: University of Hawai'i Press
Citation: Choat JH. 1965. Sexual dimorphism in the labrid fish Pseudolabrus celidotus (Bloch and Schneider) 1801. Pac Sci 19(4): 451-457.
Abstract: During a systematic study of New Zealand
fishes belonging to the genus Pseudolabrus
Bleeker 1861, it was observed that one of
the commonest species, P. celidotus, occurred
in two distinct colour phases. This was first
noted by Richardson (1848) who described
the two colour variants as separate species. The
subsequent literature did not recognise these as
species, but merely as varieties, although the
true relationship was not clarified. A study of
populations of this species, both in the field
and in the laboratory, revealed that the colour
differences were due to sexual rather than environmental
or geographic factors, and represented
a moderately developed degree of sexual
dimorphism. An attempt has been made here
to examine the relative proportions of each
colour phase in selected populations, the sequence
of transition from one colour phase to
the other, and the sizes at which transition
ISSN: 0030-8870

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