Stomach Contents of a Fresh-Water Clam, Corbicula sandai, from Lake Biwa

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  • HAYASHI Kazumasa
    Biological Laboratory, Faculty of Liberal Art, Shiga University and Kizaki Junior High School
  • OTANI Shoei
    Biological Laboratory, Faculty of Liberal Art, Shiga University and Kizaki Junior High School

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  • 琵琶湖産セタシジミの消化管内容物について
  • ビワコサン セタシジミ ノ ショウカカン ナイヨウブツ ニ ツイテ

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The results of the microscopical and quantitative observations on the contents in the digestive organs of Corbicula sandai in April, August, October and December are as follows : 1. In April and August the contents filled up more than about one-third of the digestive organs, while none of them can be observed in October but much in December. 2. About 37% (weight ratio of dried materials) of contents of food masses are of organic substances. 3. 62∿70% (area ratio) of contents of digestive organs are humus substances, mud and sand, 2∿3% are spicules of fresh water sponges, and the residue-29∿36% are animals and plants. 4. The numbers of genus, species, varietus and forma of animals and plants observed in food contents of digestive organs are... [table] Besides the above indicated plants and animals, spicules of freshwater sponges, and humus are observed in food masses of digestive organs of Corbicula sandai. 5. Diatomeae and Conjugatae are especially abundant. Among Diatomeae, Stephanodiscus carconensis and its variety, and Melosira take the greater part of detected organisms-in August, in the mussels of sandy mud bottom the above mentioned two genera (Stephanodiscus and Melosira) have about 50% of all detected organisms in the food masses, and in other months more than 80%. In Conjugatae, Staurastrum dorsidentiferum var. ornatum take 50∿60% of detected organisms of the mussels of various bottoms in October, and also take the same % in the mussels of sand and sandy mud bottom in December. 6. Feeding ratio in Winter is large compared with that of other seasons, but digestion ratio is small. 7. Food materials in their digestive organs show no marked seasonal differences.

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