REPRODUCTIVE BIOLOGY OF THE MYSTID A. trigibba, LITORAL ZONE,SOUTH SINALOA

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The study focuses on the biology and reproduction of the mysid Amathimysis trigibba, highlighting its restricted distribution to shallower areas and peak abundance from October to March. Ovigerous females averaged 2.76 mm in length, while males were slightly larger at 3.04 mm. The sex ratio favored females significantly at 3.8:1, with fecundity ranging from 1 to 11 embryos, averaging 5.26. Four marsupial development stages were identified, showing low mortality rates and no significant correlation between female size and fecundity.