水産動物の消化管に存在するキチン分解細菌に関する研究-1-
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Although many workers2)3)4)5) have detected chitin-decomposing bacteria in the digestive tract of certain animals, little information are found regard as its nutritional problem to the host. SEKI and TAGA5) found a chitin-decomposing bacteria in the digestive tracts of octopus, spuid and swell-fish and suggested that this bacteria is not important with respect to the nutrition for these animals, because the amount of the products formed, due to chitin decomposition, which may be easily utilized by the host is very little. However, in spite of their suggestion, the importance of symbiotic bacteria aiding animals in the digestion of chitin should not be negligible. In the previous paper2), by the present authors it was reported that the chitin-decomposing bacteria were present in the stomach of Japanese sea-bass, Lateolabrax japonicus. The present study was carried out in order to demonstrate the population of chitin-decompsing bacteria present in the digestive tract of this fish, and also the effects of some environmental conditions on the bacterial counts were ascertained. Results obtained are as follows. 1) As the medium used for the counting of chitin-decomposing bacteria, there are few differences between the medium prepared with fresh water containing 2.5% NaCl and that with natural sea water (Table 1). 2) There are few differences between the result obtained by the liquid culture and that by the agar plate culture, when the dilution method is used for the counting of chitin-decomposing bacteria (Table 2). 3) When the chitin-decomposing bacteria present in digestive tract of Japanese sea-bass is counted using the medium adjusted pH 4.5 and pH 7.0, the results obtained are more larger in the latter case (Table 3). 4) A greater part of total bacterial cells present in the digestive tract of this fish is chitin-decomposing bacteria (Table 2 and Table 3).
- 社団法人 日本水産学会の論文
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