GROWTH RELATION IN SOME SMALL EXPERIMENTAL POPULATIONS OF RAINBOW TROUT FRY, SALMO GAIRDNERI RICHARDSON WITH SPECIAL REFERENCE TO SOCIAL RELATIONS AMONG INDIVIDUALS
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YAMAGISHI, Hiroshi (Tokyo Metropolitan Univ., Tokyo) Growth relation in some small experimental populations of the rainbow trout fry, Salmo gairdneri RICHARDSON with special reference to social relations among individuals. Jap. J. Ecol. 12,43-53,(1962). In several small experimental populations of minute size-variation, the growth of the fry was studied with observations on social behaviour. 1. In the earlier course of the experiment it was seen that a socially dominated fry grew not always faster than the subordinated ones. In the later course, however, the former grew most rapidly and ranked first in size. These facts showed the existance of some periods in which the "size hierarchy" is not directly effective to growth. 2. Under the same population density both growth and survival rates increased. with an increase of bottom area of tanks. These rates were especially high when the bottom area was far greater than the potential maximum size of the territory which one fry could occupy (about 3500〜4000cm^2). 3. Differences of growth of individuals and mortality of the population were increased when food was given to the limited area. 4. Observations of social behaviour of the fry under natural and experimental conditions showed that visual isolation by bottom topography played an important role in the formation of trout territory.
- 日本生態学会の論文
- 1962-04-01
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