Temporary Octopus Fishery Closures SW Madagascar Modeling the Economic Benefits of Temporary Octopus Fisheries Closures

Temporary Octopus Fishery Closures SW Madagascar Modeling the Economic Benefits of Temporary Octopus Fisheries Closures Kirsten LL Oleson NREM – U. Hawai’i Tom A Oliver HIMB – U. Hawai’i Ratsimbazafy H, Benbow S, Raberinary D, Humber F Alasdair Harris Blue Ventures

91% of adults are fisher or gleaners Average per capita income – $1.86 (PPP)/day

Co-Sponsored Site Closed For Three Months Two Villages’ Octopus Fishing Grounds

Do village octopus closures increase catch? Do the costs of the closures pay-off economically?

Current Data Set 258,108 Individual Octopus 320 Mapped Fishing Sites Across 17 Villages 2004 – Closures in Velondriake to date Enough data in 37 of 69

Landings Over Time

Do village octopus closures increase catch? Do the costs of the closures pay-off economically?

Do Octopus Closures Increase Catch? Before, After, Control, Impact Framework 37 Closure Sites 37 Control Sites

Do Octopus Closures Increase Catch? Before, After, Control, Impact Framework 37 Closure Sites 37 Control Sites Closure (2-7 Months) Closure (2-7 Months) 37 Closure Sites 37 Control Sites 6 Weeks Before6 Weeks After No Closure

Control Sites: +40% (NS) Closure Sites: +423% ***

Landings + 5 times (kg) Landings + 5 times (kg)

+33% * +108% *** + 6% (NS) + 17% (NS)

+33% * +108% *** Catch per Unit Effort % (kg/fisher-day) Catch per Unit Effort % (kg/fisher-day)

Do Octopus Closures Increase Catch? Yes.

Do village octopus closures increase catch? Do the costs of the closures pay-off economically?

Village scale “costs”? Closure scale “costs”?

Village Level Octopus Fishery Revenue Closures: Clear Benefit – No Clear Fishery “Cost” Total Village-Level Revenue ($ PPP) +100% *** +8% NS Before During After

Closure vs. No Closure: Site–Based Cost Model Actual Closure Data Actual Closure Data Closure

Actual Closure Data Actual Closure Data “No Closure” Modeled From Fishery Data “No Closure” Modeled From Fishery Data Closure No Closure Closure vs. No Closure: Site–Based Cost Model

Actual / Simulated Closure Period > Closure Profitable if Closure vs. No Closure: Site–Based Cost Model

Actual / Simulated Closure Period < Closure Not Profitable if Closure vs. No Closure: Site–Based Cost Model

Actual / Simulated Closure Period Net Earnings (NE) How much money it will make Internal Rate of Return (IRR) How quickly it will make it Closure vs. No Closure: Site–Based Cost Model

Monthly Internal Rate of Return (%) Net Earnings ($ PPP) Profitability of 37 Closures (Median of 1000 Model Runs)

Monthly Internal Rate of Return (%) Net Earnings ($ PPP) Profitability of 37 Closures (Median of 1000 Model Runs) Not Profitable: 9/37 Profitable: 28/37 Mean NE: $450(PPP) Mean Monthly IRR: 88% Profitable: 28/37 Mean NE: $450(PPP) Mean Monthly IRR: 88%

Monthly Internal Rate of Return (%) Net Earnings ($ PPP) Profitability of 37 Closures (Median of 1000 Model Runs)

Monthly Internal Rate of Return (%) Net Earnings ($ PPP) Profitability of 37 Closures (Median of 1000 Model Runs) Not Profitable: 9/37 Profitable at 30% Monthly Discount Rate: 20/37

Monthly Internal Rate of Return (%) Net Earnings ($ PPP) Profitability: Effect of Illegal Catch (Median of 1000 Model Runs)

Illegal Catch as Percentage of Baseline Catch (%) Net Earnings ($ PPP) Effect of Illegal Catch on Net Earnings (Median of 1000 Model Runs)

Do the costs of the closures pay off economically? Yes. Majority of Closures Profitable: 28/37 NE: + $450 (PPP) Majority of Closures Profitable: 28/37 NE: + $450 (PPP)

Fisheries BenefitsEconomic Benefits Social Benefits Increased understanding of and support for community management

Study brought to you by: 250,000+ measured octopus 3,000+ cooperative fishers Hundreds of households Dozens of patient nahoda, informants 1,000+ hours of data collection, entry, QC Immeasurable effort of BV staff Photos courtesy of Garth Cripps Questions?: Or:

Modeling Costs & Benefits: The Closure Site–Based Economic Model Actual Closure Data Actual Closure Data “No Closure” Modeled From Fishery Data “No Closure” Modeled From Fishery Data Closure Period

Modeling Costs & Benefits: The Closure Site–Based Economic Model Actual Closure Data Actual Closure Data “No Closure” Modeled From Fishery Data “No Closure” Modeled From Fishery Data Closure Period

Actual / Simulated Modeling Costs & Benefits: The Closure Site–Based Economic Model Closure Period Actual Closure Catch C

Actual / Simulated Modeling Costs & Benefits: The Closure Site–Based Economic Model Closure Period Modeled No Closure “Catch” NC