Lake Trout Swim-up 1985-1992

The lake trout (Salvelinus namaycush is native to the Great Lakes and has long supported valuable commercial and sport fisheries in those lakes. In the 1970's and 80's, scientific evidence of successful reproduction by native or stocked lake trout populations in Lake Huron was scant. Suspected sources of lake trout, early life history mortality were: (1) Failure to hatch of fertilized lake trout eggs, deposited by adults on nearshore spawning grounds, and (2) Failure of fertilized lake trout eggs and recently-hatched lake trout fry to survive exposure to physical and environmental conditions within interstitial spaces of the rock-rubble on known lake trout spawning grounds in nearshore and offshore waters of Lake Huron, prior to their emergence (swim-up). To address these two suspected sources of early life mortality, scientific studies were conducted by Dr. Bruce Manny, Research Fishery Biologist, and others at the US Geological Survey's Great Lake Science Center in Ann Arbor, MI, at one of the Center's field stations, the Hammond Bay Biological Station on Northeastern Lake Huron, and from research boats deployed on several known lake trout spawning grounds in Lakes Huron, Michigan, Ontario, and Superior, during spawning season and subsequent egg incubation, egg hatch, and larval incubation, from 1988 to 1992. The Lake Trout Swim-up data is comprised of unpublished scientific data from studies conducted with lake trout eggs and fry in the laboratory and in the field. The data set consists of 18 tables extracted from a relaitonal database related to this study of Lake Trout mortality and deformities in Michigan lakes.

湖鳟（*Salvelinus namaycush*）原产于北美五大湖区域，长期以来支撑起当地极具经济价值的商业捕捞与游钓渔业。20世纪70至80年代，休伦湖本地或放养湖鳟种群成功繁殖的科学证据极为匮乏。研究推测的湖鳟早期生活史死亡率诱因包含两点：其一，成体在近岸产卵场产下的受精湖鳟卵无法成功孵化；其二，在休伦湖近岸及远海已知的湖鳟产卵场中，受精卵与刚孵化的湖鳟幼鱼在钻出岩屑间隙上浮（Swim-up）前，无法适应当地物理与环境条件而死亡。为解决这两类疑似早期死亡诱因，美国地质调查局（US Geological Survey）密歇根州安阿伯市五大湖科学中心的研究渔业生物学家Bruce Manny博士及合作者，于1988年至1992年的产卵季、后续卵孵化、幼体孵化及幼体培育阶段，依托该中心位于休伦湖东北岸的野外台站——哈蒙德湾生物站，并部署研究船前往休伦湖、密歇根湖、安大略湖及苏必利尔湖的多处已知湖鳟产卵场，开展了相关科学研究。本湖鳟上浮（Swim-up）数据集包含本次研究中未发表的实验室与野外湖鳟卵及幼体相关实验数据，数据集共包含18张数据表，均提取自与本项针对密歇根湖湖鳟死亡率与畸形的研究相关的关系型数据库。