Original scientific paper

Broodstock conditioning and gonadal development of the smooth clam Callista chione (Linnaeus, 1758) (Mollusca: Bivalvia) on the Catalan coast (NE Spain)

Marina DELGADO ; Instituto Español de Oceanografía. Centro Oceanográfico de Cádiz. Muelle de Levante s/n, P.O. Box 2609. E-11006 Cádiz, Spain
Josu PÉREZ-LARRUSCAIN ; Institut de Recerca i Tecnologia Agroalimentaries (IRTA). Centre de Aqüicultura. Carretera del Poble Nou, Km 5.5. E-43540 Sant Carles de la Rápita, Tarragona, Spain
Joan IGNASI GAIRÍN ; Institut de Recerca i Tecnologia Agroalimentaries (IRTA). Centre de Aqüicultura. Carretera del Poble Nou, Km 5.5. E-43540 Sant Carles de la Rápita, Tarragona, Spain

Abstract

In order to select the most suitable broodstock conditions for Callista chione, a conditioning experiment was performed and the gametogenic cycle of a natural population on the coast of Arenys
de Mar (Catalonia, NE Spain) was studied. The influence of food availability and sand bed presence on energy balance and gonadal development was analyzed, also the proliferation of intracellular bacteria in gills was monitored. The gametogenic cycle started between August and September. In November, most of the gonads were ripe and spawning began in December. The higher abundance of spawning clams occurred between January and April (with sea surface temperature 13-15ºC). Three experimental conditions were tested in September at a constant temperature of 14ºC:T1 (0.10% of organic weight of microalgae as a proportion of the live weight of the clams per day and a sand bed); T2 (0.05% and a sand bed); T3 (0.10% without a sand bed). Gonadal maturity was a priority for this species and was reached at the end of all trials. Food availability and sand bed presence benefit survival and gonadal development. The best results were obtained in clams from trial T1. Nevertheless, broodstock conditions seemed to trigger the proliferation of intracellular bacteria in gills, and as the experiment advanced, prevalence and intensity of infection increased for all trials reaching values of 100% and between 9-40 intracellular bacteria/pair of gill plica, respectively.

Keywords

Callista chione; reproduction; temperature; food availability; sand; gills; histopathology

Hrčak ID:

162292

URI

https://hrcak.srce.hr/162292

Publication date:

28.6.2016.

Article data in other languages: croatian

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