棲所に関するイセエビの習性について
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概要
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During the daytime, Japanese spiny lobsters hide themselves in fissures and crevices of the rocky bottom, and shores with more of such shelters are better fishing grounds for the lobsters. At a good shelter, a “mizuki**” fisherman catches lobsters many times during the same season. In order to investigate the habit of shelter selection by the lobster, experiments were conducted, using a reserve pond and an aquarium. The experimental results are as follows. (1) Although the reserve pond and the aquarium had no suitable shelter, the lobsters in them were distributed in the daytime not at random but with preference depending upon the place. When several rocks were piled on the bottom for a shelter, many individuals gathered there. (2) The number of lobsters gathering in the artificial shelter of rocks was determined by its shape and construction, and by the total number of lobsters present in the aquarium. (3) When the size and construction of the shelter and the total number of lobsters were kept unaltered, the number of individuals gathering in the shelter became constant in a few days after the beginning of experiment, the rest of the animals getting settled at the most preferable parts of the aquarium. If some individuals were removed from the shelter under this condition, the decrement was filled up by recruitment from other places, and the previous number at the shelter was recovered within a few days. (4) When a shelter was constructed with several oblong rocks piled in such a way that holes of 10×l5×30cm were made among the rocks, the following relation was obtained between the total number of lobsters in the aquarium (x) and the number gathering in the shelter (y). y=a(x-A)b+A where, A, b and a are constants representing a limit within which all individuals gather in the shelter, a coefficient determined by the shape of the holes, and that determined both by b and the number of holes, respectively.
- 公益社団法人 日本水産学会の論文