S.  Ota, ?Studies on feeding habits of Pinctada martensii. II. Seasonal changes in amount of faeces?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 429-433, 1959.

S.  Ota, ?Studies on feeding habits of Pinctada martensii. III. Difference of the amount of faeces due to nuclear insertion in pearl culture?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 434-438, 1959.

S.  Ota, ?Studies on feeding habits of Pinctada martensii. IV. Difference of the amount of faeces due to different conditions of culture raft and culture grounds?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 439-442, 1959.

S.  Ota, ?Studies on feeding habits of Pinctada martensii. V. Number and size of swimming bivalve larvae fed by pearl oyster in summer?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 443-449, 1959.

S.  Ota, ?Studies on feeding habits of Pinctada martensii. II. Seasonal changes in amount of faeces?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 429-433, 1959.

S.  Ota, ?Studies on feeding habits of Pinctada martensii. III. Difference of the amount of faeces due to nuclear insertion in pearl culture?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 434-438, 1959.

S.  Ota, ?Studies on feeding habits of Pinctada martensii. IV. Difference of the amount of faeces due to different conditions of culture raft and culture grounds?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 439-442, 1959.

S.  Ota, ?Studies on feeding habits of Pinctada martensii. V. Number and size of swimming bivalve larvae fed by pearl oyster in summer?, Bulletin of the National Pearl Research Laboratory, vol. 5, pp. 443-449, 1959.