The Squalid Callista Megapitaria squalida (Bivalvia: Veneridae) fishery in Baja California Sur, Mexico

Abstract

The Squalid Callista Megapitaria squalida is one of the most important bivalve fisheries in Baja California Sur. However, there is scarce information about the current state of the fishery. In order to obtain an overview of the fishery development, spatial and temporal catch trends were analyzed. The analysis was based on monthly and by area catches records from 1999 to 2006. Results show six major fishing areas: La Paz Bay, Ojo de Liebre Lagoon, Magdalena Bay, San Ignacio Lagoon, Loreto and Santa Rosalía. In the first three areas it was observed 96% of the total catch. There was a general increase in catches from 1992 (315 t) to 2002 (1,128 t) due to the catch increase in Ojo de Liebre Lagoon and La Paz Bay. However, a substantial catch decline occurred in Magdalena Bay from 2001 (457 t) to 2006 (73 t). Since 2002 there has been a general catch decline. Therefore, the conclusion of the study affirms that the fisheries in La Paz Bay and Ojo de Liebre Lagoon are at their maximum level of exploitation. In Magdalena Bay there is evidence of overfishing, while San Ignacio Lagoon, Loreto and Santa Rosalía could have developing potential. A detailed stock assessment is recommended due to the recent negative catch trends that could indicate an excessive fishing pressure.