Discharge of foreign substances from the mantle cavity in the Pen shell Atrina (Servatrina) lischkeana

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  • リシケタイラギの外套腔内落下異物の排出
  • リシケタイラギ ノ ガイトウ クウナイ ラッカ イブツ ノ ハイシュツ

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Abstract

In the pen shell, Atrina (Servatrina) lischkeana (A. (S.) pectinata lischkeana), the mechanism on discharging foreign substances from the mantle cavity was examined by observing the moving sands or films through the ciliated canal of the mantle and the gill surface at 11°C. The average movement speed of sands on the ciliated canal (22.6 mm/min) was similar to those on the gill surface (22.4 mm/min) . The speed of vertical movement was slower by one-fourth to one-fifth compared with the speed of horizontal movement. The sands in the mantle cavity were discharged after being shaped into a cord mixed with mucus even when the mantle was closed. However, animals completely stopped discharging sand when they closed the shell valves in diluted seawater (salinity 18) . Morphological observation demonstrated that the ciliated canal formed tubular consisted of two walls of mantle and that many mucilage cells with cilia existed at the epithelium of the canal. Based on these findings, it was concluded that the ciliated canals as well as the gill surface work to remove foreign substances and subsequently discharge these substances from the mantle cavity after mixing with mucus to form a cord-like shape. Though discharge is carried out even if the mantles are closed, discharge stops when the shell valves close.

Journal

  • Aquaculture Science

    Aquaculture Science 55 (1), 77-82, 2007

    Japanese Society for Aquaculture Science

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