CONICET | Buscador de Institutos y Recursos Humanos

Introduction: Density is one of the critical factors in echinoderm larvae foraquaculture purposes. Echinoplutei larvae are very sensitive to overcrowding. High culturedensity can lead to problems with bacteria or protozoa, decreasing survival and generatingabnormal morphotypes. Objective: To evaluate the effect of culture density on survival andlarval growth in the sea urchin Arbacia dufresnii. Methods: Two days after fertilization ofA. dufresnii we we kept treatments at 1, 3, 5 and 10 larvae.ml-1, with three replicates each.We recorded survival and abnormal morphotypes periodically, as well as growth:somaticrod length, total length, and length of the post oral arms,. we applied generalized linearmodels. Results: Survival is dependent on density, time and replicates, and theirinteractions. Larval growth depended on density and time, also with interaction between thevariables. The treatment of 5 larvae.ml-1had the highest survival and larval condition.Conclusions: Larval culture of A. dufresnii had the best results at 5 larvae.ml-1.

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