Lake Ontario boasts a diverse fish community comprised of native and introduced species that support vibrant recreational, commercial and Indigenous fisheries. The effective delivery of a program to assess and control the sea lamprey (Petromyzon marinus) is crucial to achievement of Lake Ontario Fish Community Objectives of rehabilitating native fish stocks while protecting and maintaining the abundance of introduced salmonines. During 2000–2019, the Great Lakes Fishery Commission (GLFC) and its control agents, Fisheries and Oceans Canada (DFO) and the U. S. Fish and Wildlife Service (USFWS), delivered a consistent program of sea lamprey assessment and control. Beginning in 2004, rising sea lamprey abundance and marking rates on lake trout (Salvelinus namaycush) in Lake Ontario coincided with a decline of large lake trout in gillnet surveys. Efforts were undertaken to identify and control important sources of juvenile sea lampreys, including larvae that survived treatment, inhabited deepwater areas, or colonised previously uninhabited stream reaches and tributaries. A renewed reliance on proven conventional controls, including lampricide treatments and barriers, has resulted in consistent suppression of sea lamprey abundance and lake trout marking to prescribed targets in Lake Ontario during 2014–2019. This achievement is unprecedented in the 49-year history of Sea Lamprey Control Program delivery in Lake Ontario, and is attributable to the collaborative efforts of the GLFC, the control agents, and federal, provincial, state, and Indigenous partners.

安大略湖拥有由本地和引进物种组成的多样化鱼类群落，支持充满活力的休闲、商业和本土渔业。评估和控制海七鳃鳗 ( Petromyzon marinus )计划的有效实施对于实现安大略湖鱼类社区恢复本地鱼类种群的目标至关重要，同时保护和保持引入的鲑鱼的数量。在 2000-2019 年期间，五大湖渔业委员会 (GLFC) 及其控制机构加拿大渔业和海洋局 (DFO) 和美国鱼类和野生动物管理局 (USFWS) 提供了一致的海七鳃鳗评估和控制计划。从 2004 年开始，湖鳟 ( Salvelinus namaycush) 的海七鳃鳗丰度和标记率上升) 在安大略湖，恰逢刺网调查中大型湖鳟鱼数量下降。努力识别和控制幼年海七鳃鳗的重要来源，包括在处理后存活的幼体、有人居住的深水区或在以前无人居住的河段和支流中定居的幼体。在 2014-2019 年期间，重新依赖经过验证的常规控制措施，包括杀灭灯剂处理和屏障，导致对安大略湖规定目标的海七鳃鳗丰度和湖鳟鱼标记的持续抑制。这一成就在安大略湖海七鳃鳗控制计划交付的 49 年历史中是前所未有的，这归功于 GLFC、控制机构以及联邦、省、州和土著合作伙伴的共同努力。