1Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Bunkyo-machi, Nagasaki 852-8521, 2Faculty of Fisheries, Nagasaki University, Bunkyo-machi, Nagasaki 852-8521, Japan
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.