Closing the Knowledge Gap · Closing the Knowledge Gap . 1. Species Background 2. History 3....
Transcript of Closing the Knowledge Gap · Closing the Knowledge Gap . 1. Species Background 2. History 3....
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Reid Bryshun
Investigating the Decline of a Fish Species at Risk
Closing the Knowledge Gap
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1. Species Background 2. History 3. Current Knowledge 4. Issues to be Addressed 5. The Next Steps 6. Takeaway Message
Introduction
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Species Background
Bigmouth Buffalo (Ictiobus cyprinellus)
Feed on benthic invertebrates in addition to algae and food particles collected using gill rakers
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Species Background • Ideal habitat:
– Warm – Low-flow – Turbid – Filled with macrophytes
• Spring spawning in
flooded grassy areas
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Species Background
• Wide historic range
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1887 – First record of Bigmouth being found in Qu’Appelle system
1939-1943 – Various dams built
1939 – Buffalo Pound 1941 – Crooked + Round 1943 – Craven 1942 - Echo
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1887 – First record of Bigmouth being found in Qu’Appelle system
1939-1943 – Various dams built
19?? – Carp introduced
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Common Carp – A Mirror, Darkly
Bigmouth Buffalo (Ictiobus cyprinellus)
Common Carp (Cyprinus carpio)
Share an ecological niche – diet, habitat, spawning sites and times
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1887 – First record of Bigmouth being found in Qu’Appelle system
1950 – Commercial Bigmouth fishery opens
1939-1943 – Various dams built
19?? – Carp introduced
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Carp rare, Bigmouth abundant
3 Carp to 100 Bigmouth
1955/56 – Population assessment by Johnson
1887 – First record of Bigmouth being found in Qu’Appelle system
1939-1943 – Various dams built
1950 – Commercial Bigmouth fishery opens
19?? – Carp introduced
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1955/56 – Population assessment by Johnson
1887 – First record of Bigmouth being found in Qu’Appelle system
1939-1943 – Various dams built
1950 – Commercial Bigmouth fishery opens
19?? – Carp introduced
1957 – Katepwa Dam built
1967 – Qu’Appelle Dam built
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1989 – 1st Bigmouth COSEWIC report – Listed as Special Concern
2000 – Population assessment by Hlasny
1955/56 – Population assessment by Johnson
1887 – First record of Bigmouth being found in Qu’Appelle system
1957 – Katepwa Dam built
1939-1943 – Various dams built
1950 – Commercial Bigmouth fishery opens
19?? – Carp introduced
1983 – Commercial Bigmouth fishery closes
1967 – Qu’Appelle Dam built
568 Carp to 100 Bigmouth
Estimates population size in Pasqua Lake to be 8535
individuals
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1955/56 – Population assessment by Johnson
1887 – First record of Bigmouth being found in Qu’Appelle system
1957 – Katepwa Dam built
1939-1943 – Various dams built
1950 – Commercial Bigmouth fishery opens
19?? – Carp introduced
1983 – Commercial Bigmouth fishery closes
1989 – 1st Bigmouth COSEWIC report – Listed as Special Concern
1967 – Qu’Appelle Dam built
2000 – Population assessment by Hlasny
2009 – 2nd Bigmouth COSEWIC report – Action plan needed
2017 – Bigmouth action plan enacted
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• Bigmouth buffalo population likely declined over a 70 year period in the Qu’Appelle River system because of: – Addition of dams and water control measures – Introduction of common carp – Commercial fishery
Bigmouth Buffalo: Why at risk?
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• Recent efforts by the Water Security Agency have determined: – Rough population age assessment – Key locations in Saskatchewan
• Spawning habitat • Summer staging areas
Current Knowledge
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• Large gaps between population assessments
Issues to be Addressed
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• Studies only focused on specific locations, not the system as a whole
Issues to be Addressed
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• Unification of Saskatchewan and Manitoba studies
The Next Steps
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• Assessing system-wide population numbers and distribution
The Next Steps
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• Quantify the effects of carp on bigmouth
The Next Steps
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• Numerous complex issues facing bigmouth buffalo
• Information and studies have been scarce and
must be unified to properly assess the population
What to Take Away
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Questions
Bigmouth Buffalo (Ictiobus cyprinellus)