鹿児島県薩摩半島から得られた標本に基づく日本初記録のスズメダイ科魚類Chromis cinerascensワカタケスズメダイ（新称）

抄録

During an ichthyofaunal survey of the East China Sea coast of Satsuma Peninsula, Kagoshima Prefecture, Japan, a single specimen (58.6 mm standard length) of the Green Chromis Chromis cinerascens (Cuvier, 1830) (Perciformes: Pomacentridae) was collected from Kasasa, Minami-satsuma, at a depth of 8 m on 5 Apr. 2023. The specimen was characterized by the following combination of characters: dorsal-fin rays XIII, 11; pectoral-fin rays 19; tubed lateral-line scales 18; total gill rakers 27; body depth 48.3% of standard length; head and body greenish with yellowish hue; and fins translucent greenish. Chromis cinerascens is widely distributed in the eastern Indian and western Pacific oceans, but in Japanese waters has been previously recorded only from an underwater photograph taken off the south coast of Satsuma Peninsula (Bonotsu, Minami-satsuma). Therefore, the present specimen, described herein in detail, represents the first specimen-based Japanese record of C. cinerascens, as well as the northernmost record of the species. In addition, the identities of several underwater photographs of C. cinerascens taken off the coast of Satsuma Peninsula between 24 Oct. 2018 and 7 June 2023 were confirmed. The intermittent occurrence of C. cinerascens along the Satsuma Peninsula is thought to represent incidental migration from more southern waters via the Kuroshio Current. Although C. cinerascens is known to form large aggregations in shallow muddy areas within its usual distribution area, the sporadic occurrence and few individuals observed off Satsuma Peninsula suggest that the species is not currently reproducing in Japanese waters. The new standard Japanese name “Wakatake-suzumedai” is proposed for the species.