Observation on the length of the digestive time of feed by the mud loach, Misgurnus anguillicaudatus

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This study has been made as to the length of the digestive time spent by the mud loach; the main points of its result are as follows; I had beforehand put some cobitises in a pisciculture bath and then as feed-stuff gave them some raw flesh of Viviparaus malleatus and red-shrimps (Penacopsis) which was dyed with edible rouge. Then I observed the length of the time of its digestion by them, seeing the changes of the contents in their alimentary organs. Thus I found that the loach which was given raw flesh of Viviparaus malleatusas feed needed about 20 hours almost to complete thedigestion in their stomaches, while they needed less than 20 hours to excrete the indigestible stuff; that the loach which was given that of red-shrimps needed about 24 hours in the former case and about 20 hours in the latter case even in the quickest time; and that when the feed stuff was over-eaten the raw flesh of both Viviparaus malleatus and red-shrimps needed longer hours to be digested. It seems that these facts probably have some close connections with the stomach which may be called a store-room of food and the intestine which has very weak digestive power with respiratory function. At any rate, I think, these are very interesting phenomena.
日本魚類学会の論文