Effect of Gill Damage on Ventilation in the Pen Shell, Atrina (Servatrina) lischkeana

概要

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To infer the cause of mortality at the so-called "withering on stalk"of the pen shell, Atrina (Servatrina) lischkeana, an experiment was performed recording the ventilation volume (Vg) continuously using an abnormal pen shell which had greatly opened the body from the sand (standing individual) . The soft part of the pen shell was observed macroscopically. Standing individual had more than 30% of gills damaged. Vg decreased with increases in the degree of gill damage. Vg were 577 ml/min/kg in normal individual and 38 ml/min/kg in standing individual with 90-95% gill damage under normoxic condition. Although Vg increased under hypoxic condition, the ratio of increase decreased with increasing degrees of gill damage: 5.2 times normoxic Vg in the normal individual and 1.1 times in standing individuals with 90-95% damaged gills. From the results, when the gills are damaged more than 30%, the pen shell should project most of the body from the sea bed in order to reduce the resistance of inflowing water into the mantle cavity by widely opening the inhalant.
日本水産増殖学会の論文