Excessive Transitory Migration of Guppy Populations. III. Analysis of Perception of Swimming Space and a Mirror Effect : Behavior Biology

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In an aquarium halved with a slitted septum, a population of guppy put into one compartment moved excessively to the other compartment (the excessive transitory migration. E.T.M.) and gradually approached and equal distribution. It was analyzed using a mirror whether the initial excessive migration and subsequent approach to final balance is performed by the information of real space or visual images of space. If the fish move according to the information by non-visual sense, their migration would be excessive referring to a balance level owing to the volume ratio between compartments. On the other hand, if they behave so due to visual informations, the initial migration and subsequent attainment to final balance would be performed referring to a balance expected from the ratio modified by a mirror image. Experiments showed that the population approached a balance expected from visual information, not that from real space. The information of the density of fish in the recovery to final balance was discussed in relation to the perception of real space or visual image of space.
1989-10-15