Sexual Maturity, Spawning and Sex Ratio of the Two Forms of Flatfish, Genus Pleuronichthys, in Kiisuido Channel Waters off the Pacific Coast of Central Japan.
Year: 1996
Type: article
Abstract: Sexual maturity, spawning season and sex ratio in the two sibling species of flatfish, genus Pleuronichthys, Honmeita and Bakemeita were surveyed. Spawning season in the Honmeita was estimated to be from the middle of November to the beginning of January, while the Bakemeita was estimated to be from the middle of January to the beginning of May. The Existence of seasonal isolation in the spawning season between the two forms was distinctive. However, there remained the possibility of reciprocal crossing between the two forms in January, because the period in which mature males with fully matured testis were observed was much longer than the spawning season. In this report, the existence of another reproductive isolation mechanism, such as geological isolation of spawning ground, is suggested, considering the absence of heterozygous variants of these two forms in isozyme analysis and the lack of common mtDNA haplotypes between the two forms.Differences in the sex ratio were also demonstrated between the two species. The sex ratio of Honmeita and Bakemeita were 1.5 and 1.0 respectively.
Source: NIPPON SUISAN GAKKAISHI
DOI: 10.2331/suisan.62.17
Institutions: Tokai University, Tokushima Prefectural Government
Language: English
Subfield: Physiology
Domain: Life Sciences
SDG: Life below water
Open Access status: bronze
OpenAlex ID: W2312478232