1965年夏期大村湾赤潮時の海況とその被害―4 : .赤潮による水産被害について

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  • The Hydrographic Conditions and the Fisheries Damages by the Red Water Occurred in Omura Bay in Summer 1965―IV.Mass-Mortality of Fishes Resultant of the Red Water

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The first red water appeared in the south-western coast of Omura Bay from middle July to early August, and the second one spread all over the southern part of the Bay from latter August to middle September 1965. Both bloomings were due to Gymnodinium sp. This paper mainly deals with the second one. This blooming was accompanied by the phenomenon that dissolved oxygen in the bottom water-mass dwindled into zero, and also by the mass-mortality of fishes―goby, blenny, globefish, common eel, octopus, dragonet, anchovy, gray mullet, conger eel, etc. Nevertheless the distribution of blooming was limited to the southern part and the water-mass without dissolved oxygen and the mass-mortality extended all over the bay. What has caused this mass-mortality ? From the status of the red water, the dissolved oxygen content in the bottom water-mass and the progress of decomposition above the ark shell, it was assumed that the mass-mortality of fishes and invertebrates was not caused by the red water, but primarily by the depletion of dissolved oxygen in the bottom water-mass all over the Bay.

長崎大学水産学部研究報告, v.21, pp.115-129; 1966

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