12 0 0 0 OA 福井県で水揚げされた雌雄間性のズワイガニ
- 著者
- 角田 啓斗 山野 仁司 豊田 賢治
- 出版者
- アクオス研究所
- 雑誌
- 水生動物 (ISSN:24348643)
- 巻号頁・発行日
- vol.2023, pp.AA2023-23, 2023-11-27 (Released:2023-11-27)
Many morphological abnormalities have been reported in crab species, including intersexual or gynandromorphic individuals with both male and female traits and morphological deformities of the chelipeds and other parts of the body. A gynandromorphic individual of the snow crab Chionoecetes opilio was recently captured in Fukui Prefecture, Japan, on November 12, 2023. This specimen had some characteristics of the male with terminal molt such as a huge carapace width and enlarged chela height, on the other hand, it had a female-like widened abdominal width. It also had male-like first pleopods and female-like pleopods with hairs. Although histological observations could not be made because it had been boiled, the gonad appeared to be an ovary. This is a gynandromorphic individual with both male and female morphological characteristics, therefore, a detailed record is hereby provided.
9 0 0 0 OA 石川県からクロヘリメジロザメ(メジロザメ目:メジロザメ科)の初記録
- 著者
- 角田 啓斗 新田 理人 豊田 賢治
- 出版者
- アクオス研究所
- 雑誌
- 水生動物 (ISSN:24348643)
- 巻号頁・発行日
- vol.2023, pp.AA2023-22, 2023-11-01 (Released:2023-11-01)
A carcharhinid shark was caught in a set-net fishery off Wajima City in Ishikawa Prefecture, Japan. The individual was identified as a copper shark Carcharhinus brachyurus based on morphological characteristics and DNA barcoding using the 12S ribosomal RNA and cytochrome c oxidase subunit l gene (cox1) regions of the mitochondrial DNA. In Japan, the copper shark has been recorded from the Sea of Japan, including the coasts of Hokkaido, Niigata and Yamaguchi prefectures; and from the Pacific coast, including the Kashima-nada Sea, the east coast of the Boso Peninsula, Sagami Bay, the Ariake Sea and the south coast of Kyushu. This report represents the first reliable record of the copper shark from Ishikawa Prefecture.