トビゴイに関する研究-IV : 試驗魚群に加えられた少数のやや大きい個体群の影響および飼育密度の影響について

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The authors have ecologically studied the phenomenon of the so-called Tobi-koi or shoot carp and made clear the following facts in their three reports published: (1) The shoot carp appear at very early stages of growth in which carp fry begin to feed on cladocerans. (2) With an insufficient amount of food and with food of particles of various sizes the shoot carp occur more conspicuously than to the contrary. (3) In batch of carp from which the shoot carp have been removed new shoot ones can appear again. And, (4) the shoot carp do not occur when carp fry are cultured in individual vessels and given a sufficient amount of food, that is, when there is no competition for food among them. In the present report the authors consider results of culture in which a batch of carp fry is supplied with a little larger individuals and influence of the relation between culture density and amount of food upon the occurrence of shoot carp. The following results were obtained; (1) When experimental batches of carp fry are reared after 5 or 10% of a little larger individuals are added to them, the added larger individuals show a faster growth and take the form of shoot carp. The original experimental animals grow evenly and the shoot carp do not appear among them. (2) Carp fry were reared with various densities. If the amount of food are varied proportionally with the culture density, there is little difference in the occurrence of shoot carp among the experimental batches. But when the amount of food is the same in all the experimental batches and thus the space and amount of food available for an animal are varied with the culture density, the occurrence of shoot carp is much more remarkable with the higher densities, i. e., with the smaller amount of food available for an individual, than to the contrary.
公益社団法人日本水産学会の論文

トビゴイに関する研究-IV : 試驗魚群に加えられた少数のやや大きい個体群の影響および飼育密度の影響について

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