Itthiphon khong pariman oxygen nai nam thi mi to kan charoen toepto khong pla.
1985
Sukhum Rowchai
The significance of dissolved oxygen as an abiotic factor on growth of fish had been repeatedly reported. Many experiments had indicated that low oxygen levels usually restricted the growth of various species of fish such as Largemonth Bass, Salmon, Silver Bream and Japanese Eel. Growth of these species held at constant dissolved oxygen started to decrease at oxygen level below 60 percent saturation and decreased remarkably at the level below 40 percent saturation. The reduction in growth of fish at low oxygen level was mainly introduced by the decrease in their food consumption. It had been suggested that the minimum oxygen level for normal growth of fish should lie above 50 percent saturation. Diurnal fluctuations of dissolved oxygen were also observed to inhibit growth of Japanese Eel when oxygen level at night hour was lower than 40 percent saturation. Growth of eel subjected to the fluctuations of dissolved oxygen was more depressed when their exposure duration to low oxygen level was prolonged and when they were fed at low oxygen period.
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