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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