Untested Assumptions in Fisheries Management: the role of competition in Brook Trout declines?
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1 Untested Assumptions in Fisheries Management: the role of competition in Brook Trout declines? Brian Morrison Fisheries Biologist Ganaraska Region Conservation Authority November 22, 2012
2 Alternate Titles The Trout Management Menagerie: 50 Shades of Grey Brian s roadmap to Brook Trout Armageddon
3 Historical Overview Rivers contained Brook Trout and Atlantic Salmon Overfishing, deforestation, dams, habitat loss, and pollution eliminated or reduced abundance of original fish community by 1900
4 Historical Overview Cont. American Eel upwards of 50% of Lake Ontario nearshore biomass Sea Lamprey Harbour Seal Possibly Burbot, Whitefish, Lake Trout utilizing tributaries?
5 Lake Ontario Brook Trout Originally had adfluvial and riverine populations In 1832 Brook Trout were so plentiful, they were caught with a bucket in Orono Creek 1870 s - Wilmot described the fish (Brook Trout) as exceedingly scarce" in southern Ontario in and "in the older settled sections quite extinct Wilmot states speckled trout (Brook Trout) must soon become a luxury of the past in the older and more cleared sections of Ontario
6 Lake Ontario Brook Trout 1881 the time is gone by forever for the growth of salmon and speckled trout in the frontier streams of Ontario 1884 Wilmot s hatchery closed
7 Brook Trout A belief that Brook Trout are headwater specialists in southern Ontario Managers have followed the shifting baseline syndrome, truncating abundance and life history diversity Working with relict populations trout crumbs
8 Power 1980
9 Curry et al. 2010
10 Cobourg Creek 123 km 2 watershed Two major dams Numerous small barriers (N=66) Naturalized Chinook, Coho, Brown, Rainbow Stocking location for ATS FMP in development
11 FMP Development Began in 2006 Concern over perceived Brook Trout declines in mid-70 s Decline correlated when RBT were lifted above Pratt s Dam ~200/yr MNR management priority to use existing barriers as species partitions
12 Corbett
13 Cobourg Creek Lamprey Barrier 300 Brook Trout 250 Number of Individuals Avg = Year
14 Brook Trout Stocking 5,000 Brook Trout Yearlings Stocked into Cobourg Watershed Number of Yearlings 4,500 4,000 3,500 3,000 2,500 2,000 1,500 1, Year
15 Water Temperature Cobourg Creek 1919
16 Benthic Information Use exuviae and rock flipping to determine relative abundance or presence of Isogenoides frontalis (BioMap = 4) Rock flipping to determine presence of Epeorus sp. Epeorus pleuralis - 4 Isogenoides frontalis - 4
17 Benthic Information
18 Habitat Headwater streams Higher order channels M. Ewaschuk photos
19 Competition Brook Trout outcompete Brown Trout (Korsu et al. 2010) Brown Trout outcompete Brook Trout (Fausch & White 1981) Brook trout outcompete Chinook Salmon (Levin et al. 2002) Growth decline in Brook Trout following RBT emergence (Rose 1986)
20 Has the use of barriers as partitions increased abundance of Brook Trout?
21 Information Needs Better understanding of existing life history diversity and behavioural patterns (e.g. potential age of smolting, repeat spawning) Identification of where migratory fish spawn Use of a reference approach utilize other index programs as a guide for management (e.g. Lake Superior tribs) Long-term monitoring of core populations
22 Information Needs Cont. An expanded view of what Brook Trout habitat looks like in southern Ontario
23 Roadmap for recovery Reconnect populations and habitats, facilitate metapopulation dynamics Manage for abundance, spatial distribution, productivity, and diversity (life history and genetic) These are the four pillars of population resiliency! Support habitat and increasing natural landscape cover Protect from harvest when population sizes are small We have been managing for a graduated decline in abundance and productivity
24 Food for thought That those who promote the conservation and restoration of native species should do so with a sense of humility Reading through the letters and public pronouncements of the men who were most responsible for spreading nonnative species like rainbow trout throughout the world in the nineteenth century, I have been struck by the similarity of the rhetoric to those who promote native species restoration today. They, too, were sure they were doing the right thing for the world. Patricia Nelson Limerick 2010
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