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

9315541霍斯该奖项支持国家海洋渔业部海岸和河口生态司司长唐纳德·霍斯博士与日本京都大学渔业部田中正丸教授之间为期两年的合作研究项目。该项目结合了实地观察和实验室实验，对日本的副鼻窦炎创始人进行了研究。除了霍斯博士之外，美国国家海洋和海洋服务部的渔业生物学家约翰·塞尔登·伯克博士也将参加在日本的研究。该项目包括实地取样，以确定比目鱼幼虫迁移到日本若浅湾（日本海）和北卡罗来纳州昂斯洛湾苗圃区的垂直分布与潮汐阶段的关系。将进行底栖生物取样，以确定在两个研究区域的陆架、海滩和河口苗圃栖息地定居的比目鱼的年龄和相对生长率（耳石分析）。将进行实验室实验来比较(1)相对于潮汐阶段的幼虫活动模式，(2)与迁徙和适应低盐度相关的激素（甲状腺素和催乳素）的水平和生产活动的发育模式，以及(3)变态的发育速度和大小。虽然研究区域在气候上相似，但它们在潮汐差、沿海盐度和河口栖息地的可用性方面存在差异，从而可以比较来自不同物理环境的副鱼纲。物种之间的相似性和差异与物理因素有关，应该为托儿所的招募过程提供见解。＊＊＊

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. ***