U.S.-Japan Cooperative Research: Immigration and Settlementof Paralichthid Flounders; a Potential Source of RecruitmentVariation

9315541霍斯该奖项支持日本国家海洋水产厅海岸与河口生态部主任唐纳德·霍斯博士与日本京都大学水产学系田中正郎教授之间为期两年的合作研究项目。该项目将实地观察和实验室实验相结合，对日本的副寄生虫创始人进行了研究。除了霍斯博士，NMFS的渔业生物学家约翰·塞尔登·伯克博士也将参与日本的这项研究。该项目涉及现场采样，以确定迁徙到日本和歌萨湾(日本海)和北卡罗来纳州昂斯洛湾育苗区的比目鱼幼体的垂直分布与潮汐阶段的关系。将进行底栖生物采样，以确定两个研究区陆架、海滩和河口苗圃生境中定居比目鱼的年龄和相对增长率(耳石分析)。实验室实验将比较(1)幼虫相对于潮汐阶段的活动模式，(2)与低盐度(甲状腺素和催乳素)迁移和适应有关的激素水平和生产活动的发育模式，以及(3)变态时的发育速度和大小。虽然两个研究区的气候相似，但它们在潮差、海岸盐度和河口栖息地的可获得性方面存在差异，从而可以比较不同物理环境中的副海洋生物。物种之间在生理因素上的相似和不同应该为苗圃的招募过程提供洞察。***

9315541 Hoss This award supports a two-year cooperative research project between Dr. Donald Hoss, Chief of the Coastal and Estuarine Ecology Division, National Marine Fisheries Service, and Professor Masaru Tanaka, Department of Fisheries, Kyoto University, Kyoto, Japan. The project combines field observations and laboratory experiments on paralicthid founders in Japan. In addition to Dr. Hoss, Dr. John Selden Burke, a fisheries biologist at NMFS, will participate in the research in Japan. The project involves field sampling to determine vertical distribution of flounder larvae immigrating to nursery areas in Wakasa Bay, Japan (Japan Sea) and Onslow Bay, North Carolina in relation to tidal stage. Benthic sampling will be conducted to determine age and relative growth rates (otolith analysis) of settled flounders among shelf, beach, and estuarine nursery habitats in the two study areas. Laboratory experiments will be conducted to compare (1) activity patterns of larvae relative to tidal stage, (2) developmental patterns of levels and production activity of hormones associated with migration and adaptation to low salinity (thyroxine and prolactin), and (3) development rates and size at metamorphosis. Although the study areas are similar in climate, they differ in tidal range, coastal salinity, and availability of estuarine habitat, allowing comparison of paralichthids from different physical environments. Similarities and differences between the species in relation to physical factors should provide insight to processes of recruitment to nurseries. ***