Ecological study on the alien fish in Okinawa prefecture

冲绳县外来鱼类的生态学研究

• 批准号: 15580169
• 负责人: TACHIHARA Katsunori
• 金额: $ 1.92万
• 依托单位: University of the Ryukyus
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15580169/
• 关键词: Okinawa; Ryukyu Islands; alien fish; otoliths; Tilapia zillii; morphological development; age; 年令; 沖縄県; 生態系; 沖縄諸島; 八重山諸島; 大東諸島

Distribution patterns of the alien freshwater fishes in the Ryukyu Islands (Yonaguni, Iriomote, Ishigaki, Miyako, Minami-daito, Okinawa, Tokashiki, Kume, Zamami, Iheya, Izena, Okinoerabu, Tokunosima, Amami-ohsima, tanegashima Islands) were investigated from 2003 to 2005. Twenty-tow alien species were recognized in this study period.The zill tilapia, Tilapia zillii is a species intentionally introduced as bait for the Skipjack angling in Okinawa Prefecture. This species has recently been found to breed in natural rivers and pond of the Ryukyu Islands. The growth and life history of this species were studied between October 2004 to October 2005 at the Haebaru reservoir on Okinawa Island, Japan. Analysis of the marginal increment of 723 otoliths showed an annulus was formed between May to July. Maximum age was 6 years for both sexes, and patterns by the von Bertalanffy formula growth were described as Lt=214.4{1-exp[-0.16(t+1.45)] for males and Lt=97.5{1-exp[-0.61(t+0.08)] for females.The morphological development of Tilapia zillii was also described.

2003 ~ 2005年对琉球诸岛（与那国、西表、石垣、宫古、南大东、冲绳、十敷、久米、座见、伊平屋、出名、冲之岛、德之岛、奄美大岛、种子岛）外来淡水鱼类的分布格局进行了调查。本研究期间共发现外来鱼种22种，其中罗非鱼Tilapia zillii为冲绳县有意引进的鲣鱼钓饵。该物种最近被发现在琉球群岛的天然河流和池塘中繁殖。2004年10月至2005年10月在日本冲绳的海原水库对该种的生长和生活史进行了研究。723个耳石的边缘增量分析表明，5 - 7月形成了一个环。最大年龄为6岁，根据von Bertalanffy公式，生长曲线为：雄罗非鱼Lt=214.4{1-exp[-0.16（t+1.45）]，雌罗非鱼Lt=97.5{1-exp[-0.61（t+0.08）]。

项目成果

Age and Growth of the Mozambique Tilapia, Oreochromis mossambicus Introduced into the Genlca River and Okinawa Island.

引入 Genlca 河和冲绳岛的莫桑比克罗非鱼 Oreochromis mossambicus 的年龄和生长。

• 发表时间: 2003
• 期刊: SUISANZOSHOKU 51(3)
• 作者: Katsunori Tachihara;Emi Obara
• 通讯作者: Emi Obara

Morphological Development of Embryos and Juveniles in the Mozambique Tilapia, Oreochromis mossambicus as a Direct Developmental Fish.

莫桑比克罗非鱼（Oreochromis mossambicus）作为直接发育鱼的胚胎和幼鱼的形态发育。

• 发表时间: 2003
• 期刊: SUISANZOSHOKU 51(3)
• 作者: Katsunori Tachihara;Emi Obara
• 通讯作者: Emi Obara