STATE OF CHINOOK SALMON IN LAKE HURON in 1999 BY: Jim Johnson, Michigan Department of Natural Resources Lloyd Mohr, Ontario Ministry of Natural Resources.

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Presentation transcript:

STATE OF CHINOOK SALMON IN LAKE HURON in 1999 BY: Jim Johnson, Michigan Department of Natural Resources Lloyd Mohr, Ontario Ministry of Natural Resources Greg Wright, Chippewa Ottawa Fishery Resource Authority

CHINOOK STOCKING TRENDS LAKE HURON, ALL AGENCIES 2 CREEL CENSUS BEGINS 20% reduction in stocking

ESTIMATED CHINOOK HARVEST (KG), GEORGIAN BAY & MAIN BASIN L. HURON 1 MEANS, : 935,600 KG 2,062,625 LB 147,330 STONE 935,601 kg average Salmonine objective is 2.4 million kg

CHINOOK CATCH AND CATCH RATES, INDEX PORTS, MAIN BASIN LAKE HURON CATCH/100 HRNO. HARVESTED 1

Chinook Salmon Catch Rates on Lake Michigan Compared to Lake Huron Charlevoix Fisheries Station CHSMIHU

TRENDS IN RECREATIONAL EFFORT, INDEX PORTS, MAIN BASIN LAKE HURON Hours 1 Mean = 1.65 million hours Mean = 1.12 million hours

Why the rise in Lake Huron chinook catch rates? The answer probably includes: Increase in pen culture Increase in vulnerability

OPEN-WATER RETURNS/100,000 STOCKED, YEAR CLASS: 1993 Released from pen vs. conventional Chi-square significant between pen & conventional 6 Total = Total = 154.7

OPEN-WATER RETURNS/100,000STOCKED YEAR CLASS: 1994 Pen reared & trucked to lake vs. conventional Chi-square significant between pen & conventional 6 Total = Total = 98.3

MEAN WEIGHTS (KG) OF CHINOOK HARVESTED, MICHIGAN RECREATIONAL CATCH, MAIN BASIN LAKE HURON 1

REGRESSION OF CPUE WITH MEAN WEIGHT, CHINOOK RECREATIONAL CATCH, MICHIGAN MAIN BASIN LAKE HURON 1 Vulnerability a function of size (prey density)?

PREY CONSUMPTION, CHINOOK SALMON, LAKE HURON

Spawning escapement trends

Mean * Mean = 5.40* *Significant (p < 0.001) decline in growth at age 3

AGE DISTRIBUTIONS, COMPARED TO , LAKE HURON PERCENT

WEIGHT-LENGTH REGRESSIONS AuSable River, compared with Escapement Catch from AuSable and Swan 1970’s: 1990’s:

Condition (Ktl) of Chinook, AuSable R. & Swan R. Escapement, 1970’s compared with 1990’s 1970’s1990’s

MANAGEMENT IMPLICATIONS

GAPS IN KNOWLEDGE Recruitment, especially from wild; Consumption and conversion efficiency rates; especially in winter; Site-specific post-stocking survival; Consequences of prey limitation: -on recruitment rates; -disease (BKD); -nutrition (EMS).

FUTURE DIRECTIONS Maintain 20% reduction in stocking; Continue site-specific marking & collections; Continue fall biological sampling; Start reproduction study (new): -mark all stocked chinooks; Encourage funding for archival depth & temperature tagging.

REPRODUCTION STUDY -LAKE HURON TECH. COMM.- Objective: Determine rates of recruitment, especially from wild Experimental design (Done in June ‘00) Mark all chinook stocked Head-hunt during summer Fall escapement surveys