the negative view problem: linkages of habitat & fish degraded tributary habitat degraded...
TRANSCRIPT
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Issues Related to Achievement of Fish Community Objectives on
Lake Huron
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The Negative View
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Problem:•Linkages of habitat & fish•Degraded tributary habitat•Degraded Saginaw Bay habitat•shoreline alteration•Loss of connectivity•contaminants
Consequence:•No achievement of FCO for: Percids, sturgeon, lake herring, anadromous salmonines, habitat•Continued fish consumption advisories
Habitat
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Non-Indigenous Species
zebra mussel
ruffe
Bythotrephes
round goby
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Non-Indigenous Species
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Non-Indigenous Species
Problems:•Sea Lamprey Predation on lake trout•Production of Lampreys in St. Marys River •Colonization by zebra mussels •Unknown effects from BC, ruffe, gobies •New invasions to come - Ballast water•Cormorant
Consequence:•Prevent rehabilitation of lake trout•Potential invasions lead to unpredictability•Prevent achievement of most FCOs•Continued management of exotic species
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Reliance on Exotic Prey Base
Problem:•Alewife and smelt dominate prey•Bloater more abundant but not used
Consequence:•Not using full potential of ecosytem •Limit ability to meet Salmonine FCO•Prevent achievment of Overall Objective•Predation on eggs & larval of native fish
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Barriers to Movement and Production of Fish in Tributaries to
Lake Huron
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Lake Sturgeon Barrier Passage Program
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Barrier Passage
Problem:•Passage of lake sturgeon•Passage of anadromous salmonids•Passage of walleye•Maintaining species diversity
Consequence:•Prevent achievement of FCO for: walleye, sturgeon, anadromous salmonids
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Barrier Passage
Problem:•Removal of barriers•Passage of anadromous salmonids
Consequence:•Expand spawning habitat for sea lamprey•Increase transport of critical contaminants
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Exploitation
Problem:•Overfishing on Lake Trout•Overfishing on Northern Pike
Consequence:•Limit recruitment•Prevent rehabilitation of lake trout•Prevent achievement of Salmonine FCO•Prevent achievement of Esocid FCO
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Complete Estimates of Harvest
Problem:•No sport harvest most of Ontario•Incomplete sport havest Michigan•Under-reported commercial harvest
Consequence:•No evaluation of harvest based FCOs
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Natural Reproduction of Chinook Salmon
Problem:•No estimate of natural reproduction
Consequence:•Salmonine & prey objectives not met •Overstocking•Increased BKD•Management problems
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Changes in Diporeia Abundance
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Problem:•Unknown affect on benthic feeding fishes•Unknown cascade effect on ecosytem
Consequence:•Limit ability to achieve Coregonine FCO?•Ecosystem not in equilibrium
Changes in Diporeia Abundance
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Cage Culture Operations
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Cage Culture Operations
Problem:•Expanding “inlake operations”•Escapement
Consequence:•Degredation of water quality•Introduction unwanted species/strains•Fish health concerns
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The Positive View
“You know, we’re justnot reaching him!”
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Coregonine Objective
•Exceeding Harvest Goal of 3.8 million kg•Lake whitefish abundance High/Stable •Lake whitefish harvest above historical levels•Lake herring abundance increasing•Round whitefish populations stable/normal?•Round whitefish harvest at historical levels•Bloater harvest at historical levels
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Salmonine Objective
•Diverse fish community of: lake trout, chinook, coho, rainbow, pink salmon•Lake trout dominant predator?•Limited lake trout rehabilitation in Parry Sound, Alpena, Owen Sound, 6-Fathom Bank•1836 Consent Decree promotes decrease in lake trout exploitation
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Percid Objective
•Walleye dominant coolwater predator over its traditional range
Sturgeon Objective
•Maintaining populations in Canadian waters
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Esocid
•Northern pike as prominent predator throughout its natural range
Channel Catfish
•Channel catfish as prominent predator throughout its natural range
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Sea Lamprey Objective
•Chemical treatment of St. Marys River 1998 & 1999
•Application of Sterile-Male Technique St. Marys River
•Increased Trapping on St. Marys River
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Natural Reproduction of Chinook
•Study started to estimate natural reproduction lakewide
Estimates of Harvest
•Expanded creel surveys in Michigan and Ontario
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Dredging the Pine (DDT)and Saginaw Rivers (PCBs)
Significant decline in PCBs, DDT, Dioxins in fish and wildlife from 1970s
Contaminants
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