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シロウオ Leucopsarion petersii の資源量の推定精度を高めるために雄の同時的複婚の可能性を野外調査と水槽実験から検討した。野外で産卵巣となる岩の下から確認された雄の数は1 例を除いて全て卵塊の数と同じかそれよりも多かった。また水槽内に単独の営巣雄と複数の雌を収容しても雄は同時に 1 個体の雌としか繁殖しなかった。これらの結果から本種雄の同時的複婚の可能性は低いと考えられた。The possibility of simultaneous polygamous mating in ice goby Leucopsarion petersii males was examined to estimate stock size with greater accuracy. In the field investigation, the number of males caught under the spawning nest was equal to or larger than the number of clutches attached under the nest, except one case. In the aquarium experiment, nesting males mated with only a single female at a time even when several females were available. These results suggested that ice goby males are unlikely to adopt simultaneous polygamous mating