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Postlarvae and juvonilos of Farlantepenaous spp. and Xiphopenaeus kroyen were collected at Boca de la Barra (Ciénaga Grande de Santa Marta) by means of a channel net that orientates with tho tido. Sampling was carried out every two weeks for a year (February 1998-February 1999) so that oach sampling date corresponded to full and now moon alternatively. Farlantopenaous spp postlarvae tended to appear in tho dry soason and with significantly greater abundance during full moon (Mann-Whitney test. P<0.05). Juveniles showed a different pattern: there were significant differences between seasons (Mann-Whitney test. P<0.05) with higher concentrations in tho rainy soason. but not so between moon phasos (Mann-Whitnoy tost. P>0.05). In tho caso o! X. kroyen in no instance s»gnifcant differences were found between seasons or moon pitases (Mann-Whitney lest, P>0.05). However, some tendencies can be pointed out: postlarvae appeared in higher proportions during the new moon but no ma;or diHoronco was rocordod botwoon soasons whoroas juvonilos appeared in greater concentracions in the rainy season with almost no difference between moon phases. These results are disscused in torms of the scanty historical previous work. The relations Tl-CL and CL-Woight and somo morphomotnc and monstic foaturos aro roportod