1 / 7

KELP-SEA URCHIN-FISHERMEN DYNAMICS: IMPLICATIONS FOR SMALL-SCALE FISHERIES MANAGEMENT

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. Thesis Sections. I. A spatially-explicit individual-based model of sea urchin, kelp and fishermen

darice
Download Presentation

KELP-SEA URCHIN-FISHERMEN DYNAMICS: IMPLICATIONS FOR SMALL-SCALE FISHERIES MANAGEMENT

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. Thesis Sections • I. A spatially-explicit individual-based model of sea urchin, kelp and fishermen • 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

  3. Fishing for uni: potential benefits of cooperative harvesting • 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

  4. Recruits Fishing for uni: potential benefits of cooperative harvesting • Approach • 5 areas with same number of urchins (B0 = 20,000) • Competitive fishery: each diver go to the area that produced the best return (as total uni production: Y = gonad yield x abundance) • Cooperative managed fishery: each diver is directed to fish each area at/around its seasonal peak • Constant recruitment (legal/mature): • Seasonal/pulse recruitment:

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

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

  7. Fishing for uni: potential benefits of cooperative harvesting • 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•B0) • Include processing costs for “bad” urchins

More Related