A Preliminary Note on Naturally Occurring Organic Substances in Sea Water Affecting the Feeding of Oysters

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Abstract
The vol. of water pumped by the oyster per unit time is, within limits, directly proportional to the concn. of an unidentified organic factor in the surrounding sea water. If the concn. of this factor is below the threshold value, which value varies with temp., the oyster will not pump at all, although it may open its shell at intervals to test the water. The factor passes through bacteriological filters; it is not thrown down by the ordinary laboratory centrifuge; it reacts as a carbohydrate with N-ethyl-carbazole reagent, or possibly the active factor is merely quantitatively associated with the carbohydrate responding to this test; and its concn., as detd. by the N-ethyl-carbazole test, varies from 2 to 25 mg./l. in different water samples.

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