WF4313/6413-Fisheries Management. Class 22

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1 WF4313/6413-Fisheries Management Class 22

2 Announcements

3

4 Revised Schedule** November 27 th No lab work on your briefs DRAFT Due 11/30/2018 by 5pm! December 4 th Brief presentations during lab. Final Exam 8am

5 WHERE WE LEFT OFF

6 Methods of Eradication & Control Chemicals Rotenone, Lampricide Physical Traps, nets, explosives, water level, electrofishing, commercial fishing Biological Predator & prey, pathogens, daughterless technologies, pheromones

7 Climate change & water Amount Temperature

8 Precipitation trends

9 Temperature trends

10

11 Pacific decadal oscillation

12 It is difficult to evaluate tease apart the effect of climate, fishery management, & population dynamics without long time series of data. CLIMATE CHANGE & MANAGEMENT CONTINUED

13 Pacific decadal oscillation Chinook Adult

14 Salmon Columbia stocks Passing Bonneville Dam

15

16 Cycles lasting up to 200 years were found while examining 500-year records of salmon abundance in Southwest Alaska. Natural variations in the abundance of spawning salmon are as large those due to human harvest.

17 A take home message Recruitment camps: 1. Climate driven 2. Spawner driven Need both Minimize excessive recruit overfishing so when conditions are good recruitment can happen

18 Coolwater species received most attention Effects on predation and so on unexplored EFFECTS ON FISHERIES

19 Effects on fish & fisheries 1. Fishery closures 2. Movement of fish stocks 3. Disease 4. And more

20

21 Hoot owl closures

22 Hoot owl

23 Movement Species like shad have shifted to the north

24 Within stream networks Move towards cooler water, if available

25 Brook trout

26 Effect on fisherman

27 Transport thermal barriers

28

29 Disease

30 INTERACTION OF TEMPERATURE, WATER FLOW, AND HABITAT FRAGMENTATION. CASE STUDY OF WILLAMETTE CHINOOK

31 Willamette basin spring Chinook Anadromous species of conservation need -Threatened status Anthropogenic modifications

32 Limited natural reproduction Big Cliff: 1953 Dexter: 1954 Big Cliff Foster: 1968 Foster Fall Creek: 1966 Cougar Cougar: 1963 Fall Creek & Dexter

33 Natural production Fall Creek Dam Dexter Dam Lookout Point Dam Historic spawning habitats Trap and haul Hills Creek Dam Historic spawning habitat

34 Natural production Fall Creek Dam Dexter Dam Lookout Point Dam Historic spawning habitats Hills Creek Dam Historic spawning habitat

35 Natural production Fall Creek Dam Another source of natural production! Dexter Dam Lookout Point Dam Historic spawning habitats Hills Creek Dam Key to recovery! Historic spawning habitat

36 Reintroduction above dams 1) Trap 2) Haul 3) Outplant

37 Problem: Prespawn mortality (PSM) In excess of 90% in some years Eggs still present Temperature

38 Prespanwing m Prespawning mortality (PSM) Year

39 Holding in cool pathogen free water Annual holding experiments at ~ 13C Willamette River Willamette Falls SF Santiam River Fall Creek MF Will River

40 PSM and thermal exposure 13 C early run 0% 0% Hatchery reared (Cool water) C late run Hatchery reared (Cool water) Expectation: Increasing PSM! Willamette hatchery Hatchery reared Outplanted fish Outplanted fish Prespawn mortality (%)

41 PSM and thermal exposure 13 C early run 0% 0% Hatchery reared (Cool water) C late run Hatchery reared (Cool water) Willamette hatchery Hatchery reared Outplanted fish Outplanted fish Prespawn mortality (%)

42 Race against time Lots Energy stored in fish Spawning Period Freshwater Entry 0 March Time October

43 Race against time Lots Freshwater Entry Pathogens in fish Spawning Period 0 March Time October

44 Race against time Accumulated degree days Mortality Threshold Prespawn mortality Spawning Period March Time October

45 Example management alternatives Hypothesized to reduce PSM 1.Trap outplant: prioritize brood stock 2.Trap outplant: proportional allocation 3.Trap, hatchery outplant Hold Outplant

46 How do we decide?

47 A decision framework Structured decision making approach 1. Simulation model 2. Decision model Data driven Research Data Monitoring Data Hatchery Data Simulation Model (uncertainty) Decision framework

48 How do we decide? Data driven Research Data Monitoring Data Hatchery Data Simulation Model (uncertainty) Decision framework

49 What are decision models? Focus on decision 1. Optimal decision 2. Account for uncertainty 3. Sensitivity of decision 4. Inform Research & Monitoring An example

50 What is the optimal decision? Hatchery holding Optimal Allocate over the run Business as usual Predicted spawners

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