Status of lake trout in Lake Superior 1993-2000 Shawn Sitar, MIDNR; Chuck Bronte, USFWS; Mark Ebener, CORA; Tom Fratt, RCFD; Ken Gebhardt, BMIC; Ted Halpern,

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Presentation transcript:

Status of lake trout in Lake Superior Shawn Sitar, MIDNR; Chuck Bronte, USFWS; Mark Ebener, CORA; Tom Fratt, RCFD; Ken Gebhardt, BMIC; Ted Halpern, MNDNR; Bill Mattes, GLIFWC; Gene Mensch, KBIC; Mike Petzold, OMNR; Steve Schram, WIDNR; Don Schreiner, MNDNR.

Fish Community Objective lake trout Achieve and maintain genetically diverse self- sustaining populations of lake trout that are similar to those found in the lake prior to 1940, with lean lake trout being the dominant form in near-shore waters, siscowet lake trout the dominant form in offshore waters, and humper lake trout a common form in eastern waters and around Isle Royale.

Lake trout management units in Lake Superior

Year Millions stocked Lake trout stocking in Lake Superior

Relative abundance of lake trout in Lake Superior,

Relative abundance of wild lake trout in Lake Superior, GM CPUE (fish/km/night) 153.1

Relative abundance of hatchery lake trout in Lake Superior, Management Unit GM CPUE (fish/km/night)

ON-1 ON-14 MN-1MN-2MN-3 WI-1WI-2MI-2MI-3MI-4MI-5MI-6MI-7 ON-24ON-28ON-31ON-33 Management Unit Total Annual Mortality Total annual mortality for lake trout in Lake Superior (catch curves)

Year Canada U.S. Yield (million kg) Lean lake trout commercial yield in Lake Superior,

Recent commercial harvest of lake trout in Lake Superior Avg

Recreational harvest of lake trout in Lake Superior,

Sea Lamprey Marking of Lean Lake Trout Lake Superior, Marks per 100 Fish Average

Year Marks per 100 Lake Trout Canada U. S. Lamprey Marking of Lake Trout Lake Superior,

Sea Lamprey Marking East & West U. S. Waters Lake Superior Year Marks per 100 Lake Trout West East

Lake trout yield to sea lampreys and humans in Lake Superior during Year Biomass (x 1000 kg) ,000 1,100 1, (avg.) Humans Sea lampreys

From Hansen et al. (1994) Mean length of age 7 lake trout in US waters of Lake Superior,

Mean length at age 7 for lake trout in Lake Superior, ONTARIO-EONTARIO -W MINNESOTA WISCONSIN MICHIGAN HATCHERY WILD TOTAL LENGTH (mm)

Siscowet

CPUE (Kg/km net) Relative abundance of siscowets in commercial fisheries U.S. commercial fisheries

Relative abundance of siscowets in Lake Superior (Agency surveys) Siscowet Lean Date

MN-1MI-2MI-4MI-5MI-7 Management Unit Fish /305 m Lean Siscowet 16:1 12:1 2:1 18:1 13:1 Mean = 14:1 Ratio of siscowets to leans by management unit

Age (yr) Number of fish MI-4 MI-7 MI-2 Age compositions of siscowet by management unit in 1996

Recent analyses of lake trout dynamics in Michigan waters of Lake Superior Statistical catch-at-age models for wild lake trout in MI-5, MI-6, and MI-7 (MSC, TFC) Stock-Recruitment analyses for lake trout in MI-3 through MI-7 (Jessica Richards) Comparison of historic and modern abundance in Michigan waters (Mike Wilberg)

Statistical catch-at-age models GLFC workshops. Models integrate age-specific data from diverse sources. Models used in 1836 Treaty waters to estimate quotas.

,000 1,200 1,400 1, Year MI-5 MI-6 MI-7 Wild lake trout abundance (ages 3+) Number of fish x 1,000

Year MI-5 MI-6 MI-7 Target maximum Total Mortality Rate Total annual mortality rates for ages 6-11 lake trout

Mortality rates for ages 6-11 wild lake trout in MI-5 Instantaneous mortality (year -1 ) Year Sea Lamprey Commercial Fishing Recreational Fishing Natural

Mortality rates for ages 6-11 wild lake trout in MI-6

Year Sea Lamprey Commercial Fishing Recreational Fishing Natural Mortality rates for ages 6-11 wild lake trout in MI-7 Instantaneous mortality (year -1 )

Spawning stock biomass to project safe harvest levels SSBR=the theoretical amount of mature female biomass produced per given recruit through its life. SSBR Target =The total amount of spawning stock biomass produced per recruit that suffers the target maximum mortality The SSBR values will vary over time as the mortality and maturity schedules vary over time.

MI-5MI-6MI-7 Management Unit Avg Target SSBR (kg) Spawning stock biomass

From: Doemel (2000) Lake trout stock-recruitment relationships in Michigan (Based on data)

Historic and Modern lake trout relative abundance MI-2MI-3MI-4MI-5MI-6MI-7MI-8 CPUE Historic CPUE ( ) From: Wilberg (2000)

Status of lake trout in Lake Superior 2000 Wild lake trout abundance increasing MN & WI and high levels MI waters Current abundance MI higher than historic values –recruitment peaked recently –indications of density dependence most areas. Growth rates continue to decline and began in 1970s. Siscowet abundance high & may be increasing Sea lampreys kill more lake trout than fisheries.

Recommendations Further develop & evaluate statistical population models Quantify movement patterns. Evaluate FCOs and reference points. Monitor and assess siscowet populations. Expand understanding of lake trout forms. Develop bioenergetics models to assess food web stability. Map and quantify lake trout habitat.