海水中の硝酸塩のマダコに与える影響

概要

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It has been recognized that the invertebrates, especially Octopus are difficult to keep for a long time in an aquarium with closed circulating system. In order to find out the cause of this difficulty, the present studies are carried out by investigating the influence of nitrate accumulated in culturing water with low pH values and with low alkalinity values on Octopus, since accumulation of nitrate, reduction of alkalinity and increase of hydrogen ion concentration are known to be some of remarkable characteristics in the long aged sea water of an aquarium with closed circulating system. When nitrate in accumulated in culturing water, accompanied with low alkalinity and with high hydrogen ion concentration of the water, siphoning movement of Octopus cultured in that water becomes more frequent than in natural sea water (Table 1), and the decrease of the oxygen uptake rate due to reduction of oxygen content of the water starts at higher oxygen levels (Fig. 5). The facts mentioned above confirm that these changes in quality of the long aged sea water form some of causes of the difficulty in question.
社団法人日本水産学会の論文