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In aquaculture there is considerable interest in the study of morphological and physiological aspects of shrimps under culture conditions. The petasma is a structure of the male's first pair of abdominal appendages (pleopods); the endopods of this pair join by coupling hooks (cincinnuli). It is assumed to function mechanically in transferring spermatophores. A 60 day trail was conducted with juvenile of Pleoticus muelleri to evaluate the influence of density on pleopod joint, survival and total growth. The shrimp were placed at two initial densities by triplicate (14 and 28 ind·m -2 ). Survival and growth did not vary significantly between treatments. A dependence was found between density and endopod joint; no significant differences in weight were found between animals having joined and separate endopods. Relative growth studies were conducted, data inner lobe of petasmal endopod length and carapace length fit to a linear relation. Data of weight and carapace length fit to a potential relation.

Efecto de la densidad sobre el crecimiento y el desarrollo del petasma en langostinos juveniles Pleoticus muelleri (Decapoda, Penaeoidea)