KELP-SEA URCHIN-FISHERMEN DYNAMICS: IMPLICATIONS FOR SMALL-SCALE FISHERIES MANAGEMENT Nicolas Gutierrez SAFS - UW R Hilborn, AE Punt, LW Botsford, D Armstrong,

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Presentation transcript:

KELP-SEA URCHIN-FISHERMEN DYNAMICS: IMPLICATIONS FOR SMALL-SCALE FISHERIES MANAGEMENT Nicolas Gutierrez SAFS - UW R Hilborn, AE Punt, LW Botsford, D Armstrong, D Beauchamp

I. A spatially-explicit individual-based model of sea urchin, kelp and fishermen II.Alternative approaches for sea urchin stock assessment - Gutiérrez et al. Developing a Bayesian stock assessment framework and decision analysis for the red sea urchin fishery in Baja California, Mexico (Submitted N. Am. J. Fish. Manag.) III. Exploring dedicated access management strategies for sedentary small-scale fisheries - Fishing for uni: potential benefits of cooperative harvesting Thesis Sections

Background & Motivation Roe fishery, with marked spatio-temporal patterns in gonad quality/yield (depending on food availability) SDWA and the fishing industry concerned about sustainability and economic viability. Optimize harvest flexibility and quality by: - getting biological information to better manage the fishery (BE program) - developing a community-based management strategy Fishing for uni: Selective harvesting of “well fed urchins”, by fishing those areas where the gonad yield is at its peak Fishing for uni: potential benefits of cooperative harvesting

Approach 5 areas with same number of urchins (B 0 = 20,000) 1.Competitive fishery: each diver go to the area that produced the best return (as total uni production: Y = gonad yield x abundance) 2.Cooperative managed fishery: each diver is directed to fish each area at/around its seasonal peak a.Constant recruitment (legal/mature): b.Seasonal/pulse recruitment: Fishing for uni: potential benefits of cooperative harvesting Recruits

Fishing for uni: potential benefits of cooperative harvesting DATA: Spatio-temporal variations in gonad yield (%) Area 3 a b

Preliminary results Fishing for uni: potential benefits of cooperative harvesting Catch (lbs) Revenue (US$) Competitive Cooperative Constant recruitmentSeasonal recruitment Competitive Cooperative

Next steps Increase spatial resolution of data set on gonad yield, abundance, etc Density-dependence recruitment Market considerations (e.g. price depending on catches 2 weeks earlier) Gonad Quality threshold (e.g. > 5.2 % ~ 0.75 $ per lbs) Depletion levels (e.g. B=0.4 B 0 ) Include processing costs for “bad” urchins Fishing for uni: potential benefits of cooperative harvesting