真珠漁場の底質に関する研究―1 : 早岐瀬戸周辺の佐世保湾および大村湾の底質について

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  • Studies on the Bottom Muds in the Seas of Pearl Farms―I.Stational variations of some constituents in the upper mud layers at the areas adjoining to the Haiki-Strait of the Sasebo and the Omura Bays

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During the periods from June to Nov., 1964, the authors observed the relations between the conditions of the pearl farms and the constituents of their bottom muds; sulfides, total nitrogens, organic carbons, ignition-lossing matters and reducing matters. The results obtained are as follows:― 1) Generally, the Omura Bay closed in land, abounds in sulfides, total nitrogens, organic carbons and reducing matters much more than the Sasebo Bay opened for the large seas. Under the pearl rafts, however, the quantities of these constituents have high values in both of the seas. 2) The values of ignition loss are higher in the Sasebo Bay than in the Omura Bay. Under the pearl rafts, however, these values are high, in both of the seas. 3) The ratios of organic carbon to total nitrogen are nearly ten, in the regions rich in organic matters, especially at the estuary of the Hiu, bottoms under the pearl rafts and the inlet of the strait. From the above results, we consider that these constituents are, mainly, derived from sewerages at the ordinary stations and from excretions of pearl oysters under the rafts. According to statistics, we recognize the following relations. 4) The sulfides have positive correlations with the organic carbons and the reducing matters but not with the ignition losses and the total nitrogens. 5) The ignition losses have positive correlations with the total nitrogens and the organic carbons but not with the reducing matters and ratios of organic carbon to total nitrogen. 6) The total nitrogens have positive correlation with the organic carbons and reducing matters.

長崎大学水産学部研究報告, v.19, pp.74-80; 1965

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