Abstract
In six pairings (one female × three males and vice versa) of honmoroko Gnathopogon caerulescens, although in one pairing the sex ratio of the offspring did not deviate significantly from 1:1, in four pairings the proportion of females decreased significantly with an increase in temperature. Heavy mortality due to disease was observed in the remaining pair. There were highly significant differences in sex ratios among the broods produced by different mothers with the same father and vice versa, and the response of sex ratio to temperature treatments differed considerably within pairings. The progeny of five out of 20 males produced at 34°C were almost all females, two were male‐biased, and the remaining had balanced (1:1) sex ratios. These results suggest that the sex determination system in honmoroko is close to female homogamety but is influenced by temperature, genetic factors and genotype‐temperature interactions.
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