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A study about the length at first sexual maturation reports and their comparison with the established minimum legal sizes on 1996 and 2009 regulations is presented. Several species were not included in one or the other regulation and others with fishery importance were not included in either of them. A total of 141 species were analyzed. The relationships between the smallest matured fish fork length (Lmin) and the mean length at sexual maturity (Lm) of the species was calculated: Lm = 2.54040 +1.16679 Lmin and the empirical relationship between Lm and the maximum observed fork length (Lmax) compiled in FishBase was also calculated: Lm = 13.7398 + 2.00033 Lmax. Species optimum fork length at capture (Lopt) was calculated. There were 117 species with an established legal minimum length (LML), the majority of which had their Lm (reported or calculated) smaller than LML. Reports of Lm from Cuban waters represented 27%, and those from other sites on the Caribbean were 36.9%. The dates of the majority of reports of species with LML reports from Cuban or the Caribbean waters were before 1990. It is recommended to restart the fishery biology studies to update Lm estimations and a new LML regulation was proposed to include all species considered on the present study. The present LML for 32 species are considered to be the same established and new regulations are proposed for another 84, based on their Lopt and Lm. [ABSTRACT FROM AUTHOR]