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MEPS prepress abstract   -  DOI:

Reproductive activity and seasonal variability on the biochemical composition of the pen shell, Atrina maura

M. Magali Gómez-Valdez*, Lucía Ocampo, Liliana Carvalho-Saucedo, José Luis Gutiérrez-González

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ABSTRACT: Atrina maura is a bivalve of the Pinnidae family and is the most important pen shell species fished in Mexico. To date, there is no information on the effect of the reproductive activity and environmental variables on the biochemical constituents of these organisms’ body tissues. Therefore, we studied the reproductive cycle of A. maura monthly, during 2015. Total carbohydrate, lipid, and protein content of the muscle, mantle, gonad, and digestive gland were measured. Sea surface temperature and Chlorophyll a concentration (Chl a) were obtained and the interannual differences were calculated. The results indicate that the warmer temperatures that were influenced by El Niño phenomenon, and food scarcity that was influenced by The Blob event, affected the reproductive activity of A. maura. Females exhibited massive oocyte degeneration, shorter reproductive events with intermittent spawning peaks, while males spawned continuously throughout the year but without a maturation stage. The biochemical composition indicates that this population relies on protein metabolism with no difference between sexes. The temperature had a negative effect on lipid production by the digestive gland in females while in males, carbohydrate content in the mantle was negatively affected by temperature. Food scarcity was only correlated with lower carbohydrate content in the digestive gland of females. The mantle and the digestive gland exhibited an important role during reproductive activity as a physiological adaptation to unfavorable environmental conditions such as warmer temperatures and food scarcity.