The study was conducted at the Merambong Shoal, Johor
Straits, Malaysia. Strombus canarium was the most abundant herbivorous
mollusc within the study site, highly prized as seafood and contributes
to the economics of the locals. Ontogenetic development of sex characters
and sexual maturity were determined via logistic curve analysis, using
shell-length and/or lip thickness as predictors. The minimum shell-length
at which sex characters appeared was at 30 mm in males and 32 mm in females
and both sexes can definitely be determined at more than 41 mm shell-length.
The SX50 (probability of individuals can be sexed is 0.5) was
at 38.33 ± 0.41 mm for male and at 37.15 ± 0.31 mm for female.
The SL50 (length at which the probability of individuals are
matured is 0.5) was at 54.14 ± 0.86 mm shell-lengths for males
and at 58.51 ± 1.02 mm shell-lengths for females. The LIP50
(lip thickness at which the probability of individuals are matured is
0.5) values on the other hand was about 0.69 ± 0.0003 and 0.80
± 0.014 mm for males and females respectively. The findings indicate
that sexual dimorphisms occurred at very early stage in S. canarium
Zaidi Che Cob, Aziz Arshad, Japar Sidik Bujang and Mazlan Abd. Ghaffar, 2008. Sexual Maturity and Sex Determination in Strombus canarium Linnaeus, 1758 (Gastropoda: Strombidae). Journal of Biological Sciences, 8: 616-621.