Thursday

  • 9-9:20 Updating research statement (home page).
  • 9:20 -9:40 Updating notebook: Review, Tuesday & Wednesday meetings
  • coffee
  • 9:50 Application.
  • 10-11:30:

Forage fish dynamics, Sanchirico and Essington

Jim gives the broad overview,  central question: What are the benefits/costs of a % reduction in the catch C of forage fish N:

\[ \Delta C \downarrow \to \Delta N \to  \Delta F, \Delta M \Delta S\]

F predator commercial fisheries, M marine mammals, S seabirds.

Stock effects, fishmeal fish oil, vitamin supplements

What are the benefits and costs from a percent (say 20) reduction in the catch of a forage fish?

  • Week 2: Introductory discussion on the information necessary to answer this policy question (Jim) and discussion of the current regulatory tools being used to manage forage fish around the world (Tim)
  • Week 3: Population regulation, including bottom-up/environmental controls and top-down predation controls
  • Week 4: Ecosystem function: Fish and Fisheries (relationship between forage fish abundance and productivity of harvested stocks)
  • Week 5: Ecosystem function: Charismatic Fauna: Mammals and Seabirds (how dependent are these species on forage fish, spatial issues, etc. How do these species respond to depletion of forage fish?) $M = f(M, N) $, $ S = g(S, N) $
  • Week 6: The economics of changes in higher trophic catches (what are the key issues when you go from mapping a change in an abundance of a predator fish to changes in value of the fishery? And, what examples are there from the literature on forage fish).
  • Week 7: The economics of fishmeal and the potential impacts of a reduction of catch of the forage fish on feed prices, and agricultural prices (understanding the substitution possibilities of different types of protein in diets, etc).
  • Week 8: The economic effects of the policy on direct consumption, vitamin supplements, and bait.
  • Week 9: The economics of non-market values for charismatic fauna and valuing potential changes in their populations due to the policy.
  • Week 10: Synthesis (Your job is try to put the pieces together…you can use pieces of presentation by others).

Key papers to start with:

  • Alder’s review: (Alder et. al. 2008)
  • May’s, showing MSY (max sustainable yield) cannot work for multi-species dynamics (May et. al. 1979).

Tim’s section

  • Case study: Peruvian anchovy collapse.  Upwelling west coast SA.  Mixed layer sinks during El Nino (1972), upwelling provides less nutrients.  Big loss in productivity for anchoveta.  High temps, Anchoveta cluster in colder thermal refuge.  Low recruitment plus high catch.
  • Ecosystem-based Management: Minimum escapement (instead of MSY).  Can catch fewer on bad years
  • Spatial management for central-place foragers.  (1) Spatial catch quotas, (e.g. in Southern Ocean), (2) No-take areas.  Case study in sand eel.

Next week: I’ll present week 3 with Matt Whalen, possibly Patrick.

Application writing

Edits on pmc paper

References