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Abstract ▼ AI-Helper

A study on the contents of dissolved oxygen and phytoplankton in the pond water has been carried out to determine the water quality and to investigate the cause of red water in fish ponds at Pusan Fisheries College in 1972-1973. The results obtained are as follows : 1. Measured oxygen content during...

A study on the contents of dissolved oxygen and phytoplankton in the pond water has been carried out to determine the water quality and to investigate the cause of red water in fish ponds at Pusan Fisheries College in 1972-1973. The results obtained are as follows : 1. Measured oxygen content during the period from 6th to 7th of August 1972 was: 23.95ppm ($328\%$ in saturation rate) in daytime and 0.39 ppm($5\%$) in the early morning in the water which contains heavy bloom of phytoplankton, on the other hand, in clear water the range of oxygen content was 8.72 to 6.58ppm. 2. The occurrences of red water in 1972-1973 were always caused by the sudden death of Synechocystis aquatilis (Cyanophyta) when the water temperature was very high ($30-33.5^{\circ}C$) and then high mortality of fish under rearing followed. 3. The phytoplankon observed during this study period was 133 species belonging to 55 genera in 23 families, and those of Chlorophyta was dominant in number of species, and Cyanophyta in quantity. 4. Zooplankton observed was 12 species belonging to 11 genera in 11 families, and they were very small both in number of species and in quantity compared to those of phytoplankton.