Sitka HCR Proposal 156 - Harvest Rate Comparison and Implications

Sitka HCR Proposal 156 explores the comparison of harvest rates between Sitka HCR and Proposal 156, with a focus on historic forecasts. The proposal aims to address implications related to population health indicators beyond biomass. Additionally, it discusses the impact of harvest rates on older fish in the Sac roe fishery.

• Sitka HCR
• Proposal 156
• Harvest Rate
• Population Health
• Fishery

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Uploaded on Mar 09, 2025 | 0 Views

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Presentation Transcript

1. Sitka HCR SEAK HCR 8 2 Proposal 156 Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposal 156 1

2. Slope of Sitka Sound HCR is four times greater than SEAK slope Proposal 156 simple seeks to switch the 2 and 8 back to the SEAK format The Sitka AC unanimously supported a slightly more conservative version of Proposal 156 prior to 2018 BoF meeting Note: Sitka Sound HCR no longer tied to threshold 8 2 Proposal 156 Sitka HCR Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposal 156 SEAK HCR 2

3. 20 18 Maximum difference in GHL is 3,600 tons @ 60,000 tons forecast biomass 16 Guideline Harvest Rate (%) 14 12 10 8 6 Proposal 156 Sitka HCR 4 2 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000 60,000 65,000 70,000 75,000 80,000 85,000 90,000 95,000 100,000 105,000 110,000 115,000 120,000 125,000 130,000 135,000 140,000 145,000 150,000 - Forecast Biomass (tons) Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposal 156 3

4. 45,000 40,000 Sitka HCR Proposal 156 35,000 Guideline Harvest Level (tons) 30,000 25,000 20,000 15,000 10,000 5,000 - 199819992000200120022003200420052006200720082009201020112012201320142015201620172018201920202021 Comparison of GHLs from Sitka HCR and Proposal 156 using historic forecasts Based on HCR in regs; does not include years ADFG reduced GHL (e.g. 2013, 2021) Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposal 156 4

5. Slope of Sitka Sound HCR is four times greater than SEAK slope The Sitka AC unanimously supported a slightly more conservative version of Proposal 156 prior to 2018 BoF meeting Sitka Sound HCR no longer tied to threshold Implications of threshold and AUB Issues with biomass as only indicator of population health Sitka HCR SEAK HCR 8 2 Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposal 156 Proposal 156 5

6. Sac roe fishery harvests older fish at approximately twice the rate as younger fish (based on ADFG data) In years with lots of younger fish, this can lead to high exploitation rates on older fish Proposal 157 attempts to limit the harvest rate on old fish to 20% Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposals 157 / 158 6

7. Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposals 157 / 158 7

8. Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposals 157 / 158 8

9. Sitka AC Meeting 11/4/2021 Sitka Tribe of Alaska Proposals 157 / 158 9