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Postlarval and juvenile penaeoid shrimps were collected with moored channel nets at Bear Cut, a tidal pass between the Atlantic and Biscayne Bay, Florida, from January through December 1994. Results show a much higher number of species than in previous reports. Among juveniles, Metapenaeopsis
spp., which comprised five species, was the most abundant and diverse genus. Two of them, M. martinella and M. hobbsi, constitute new records for North American waters. Despite the abundance of Metapenaeopsis spp., neither small juveniles (CL <2.0 mm) nor larger adults
(CL >12.5 mm) were caught at Bear Cut. The genus Farfantepenaeus was represented by the pink shrimp, F. duorarum, and the pink spotted shrimp, F. brasiliensis, in a proportion of 2:1. Monthly mean densities of the juvenile penaeoids Farfantepenaeus spp., Metapenaeopsis
spp ., Sicyonia spp., and Rimapenaeus constrictus showed a seasonal pattern. Densities were lowest between May and October, and highest between December and February. A two-factor repeatedmeasures ANOVA of density by depth and tidal period showed that depth does not have a significant
effect on the density for any of the juvenile taxa, but the effect of the tidal period is highly significant (α = 0.05). The reverse result was obtained for Farfantepenaeus spp. postlarvae; depth effect was significant but not tidal period. F. duorarum and F. brasiliensis
juveniles exhibited the greatest carapace length in January and February, when the highest density of shrimps were leaving the Bay. Farfantepenaeus spp. Postlarvae showed a bimodal distribution with peaks in March and November.
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