真珠養殖の貝掃除に関する研究-I : 付着生物がアコヤガイの貝殻開閉活動と糞量におよぼす影響

概要

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A study was carried out on the influence of fouling organisms upon the activity of shell movement and the amount of feces in Japanese pearl oysters, Pteria (Pinctada) martensii (DUNKER), in order to clarify if the work of shell cleaning is effective in increasing the growth of the bivalve and quality of pearls. The results obtained are as follows: 1. The daily rhythm generally found in the shell movement of healthy pearl oysters appears scarcely in the fouled oysters, while the rhythm reappears after shell cleaning. The width of shell opening also changes by cleaning the fouled shell; the shell opens far wider after shell cleaning. 2. The amount of feces collected from cultured pearl oysters increases by cleaning the fouled shell. 3. Both of the width of shell opening and the amount of feces have close relation to the weight of fouling organisms, chiefly barnacle and sea mussel, in fouled pearl oysters; the greater the weight of fouling organisms is, the less wide the shell opens and the less the feces is liberated. From these results it may be suggested that the vitality of pearl oysters is harmfully influenced by the presence of fouling organisms, with the result that the growth of the bivalve and also quality of pearls come to deteriorate.
公益社団法人日本水産学会の論文