Excessive Transitory Migration of Guppy Populations. II. Analysis of Possible Conspecific-Following Tendency : Behavior Biology

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The mechanism of the excessive transitory migration of guppy population, a fact that a population put in one of two compartments halved with a slitted septum once migrates excessively to the other compartment, was examined in relation to fish's conspecific-following tendency. For a comparative study two other fish, medaka and goldfish, were also examined. The degree of conspecific-following tendency of fish was estimated by comparing the runs, a succession of identical symbols; the distribution of length of the run of one-directioned slit-passing by guppies showed no significant difference from that in the random number series (the one-sample runs test). A direct recording of time of the slit-passing by guppies with an oscillograph clarified that they passed at intervals of fairly long time, often containing occasional opposite-directioned passing, in a strong contrast to a rapid succession of the same-directioned slit-passing in the conspecific-following goldfish. These results suggest that a conspecific-following tendency in fish is not the main cause of the excessive transitory migration.
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