managing with stocked trout afm rick lorson under construction
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MANAGING WITH MANAGING WITH STOCKED TROUTSTOCKED TROUT
AFM Rick LorsonUnder Construction
Stocked Trout Program Elements:
• Over 4 Million Adult Trout
• 8 Million Angler Trips *
• $250 Million Angler Dollars *
Other Program Elements:
• 1.2 Million Cooperative Nursery Program Adult Trout
• 1.1 Million Fingerling Trout
Presentation Purpose:
Where and How Many Trout Stocked?
How we Evaluate Stocked Trout Program.
Actual Stocked Trout Angler Use.
Streams will be covered first, then Lakes.
Adult Trout are Stocked in over 4,400 Stream Miles
• How Many Trout should be Stocked in each Stream?
Harrisburg, PA
Phoenix, AZ
Stocked Trout Streams Are Categorized By:
• Wild Trout Population• Stream Bank Ownership• Human Population Density• Average Width• Access By Roads• Amount Of Vehicle Parking
Mountain Stream
Valley River
Mountain Stream
Valley River
Wild Trout
Smallmouth Bass
Stocking Rates For Streams
• Public Stream 400/Acre
• Urban Stream 350/Acre• Suburban Stream 235/Acre• Rural Stream 125/Acre
• Small River 100/Acre• Large River 75/Acre
Wild Trout >< Stocked Trout
2020 Legal Wild Brook Trout per Mile
9090 Legal Wild Brown Trout per Mile
1,1101,110 Legal Stocked Trout per Legal Stocked Trout per Mile- Public Streams CategoryMile- Public Streams Category
Miles Stocked By Category:
• Rural Streams 2,435 miles (55%)
• Suburban Streams 652 miles (15%)
• Public Streams 462 miles (10%)
• Urban Streams 283 miles (6%)
• Small Rivers 227 miles (5%)
• Large Rivers 208 miles (5%)
How Do We Evaluate Our Trout
Stocking Program?
How Do We Evaluate Our Trout Stocking Program?
Performance MeasuresPerformance Measures
-Angler Effort
-Angler Catch *
-Angler Trips Produced
Rank each Performance Measure from Lowest to Highest to obtain:
ANGLER EFFORT ANGLER CATC H TRIPS PRODUCED
COM BINED RAN K
Some Other
Categories
for Streams
TROUT STOCKING IN LAKES
Adult Trout are Stocked in 117 Lakes
• How Many Trout should be Stocked in each Lake?
Lakes Are Categorized By:
• Lake Size
• Human Population Density-- For The Lake Itself-- For The Surrounding Area
Stocking Rates For Lakes
Very Small Lakes 600/Acre
Small Lakes 325/Acre
Medium Lakes 150/Acre
Large Lakes 75/Acre
Very Large Lakes 5/Acre
Stocked Trout Program
Stream and Lake Summaries
The Three Top Ranked Categories for Performance
Measures were:
Delayed HarvestPublic StreamsVery Small Lakes
Angler Trips on Streams were Considerably Higher for the Opening Week Compared to the Week Following an Inseason Stocking.
Trout Catch on Streams was Higher for the Week Following an Inseason Stocking Compared to the Opening Week.
Total Angler Trips for a Stream Stocking Category Statewide was Highest for Rural Streams.