[GOA OROX Split Fractions for EGOA with updated species]

[KristenOmori-NOAA]

1. Previous data supplied from the RACE bottom trawl survey: "Biomass Fractions in Eastern GOA" data sheet on AKFIN answers What it is: I think this is split fractions (or proportions) of the biomass that comes from the West Yak (640) and SE/ EY (650) areas based on the design-based indices of the Eastern GOA (unclear what level of aggregation).
2. Species and Years: If possible, can I get the split fractions (WY and SE/ EY) in the EGOA for sharpchin, harlequin, redbanded, redstripe, and silvergrey from 2019, 2021, and 2023?
3. Region: Eastern GOA (split fractions between WY and SE/EY)
4. What it is used for: The previous assessment author takes those split fractions from the past 3 surveys (2019, 2021, 2023) to calculate the proportion of biomass that should be allocated to the West Yak (640) and SE/ EY (650) areas (just the Eastern GOA). We are changing the species membership groupings this year, so the groupings posted for Other Rockfish (OROX) are different.
5. When: Oct. 20th (if possible!) It is for this assessment cycle, which needs to be completed and finalized by the end of Oct, but this goes into the harvest specifications (area allocation).
6. For: Kristen Omori (@KristenOmori-NOAA, kristen.omori@noaa.gov)

[Ned-Laman-NOAA]

Hi Kristen- Do you want the split fractions for each species you listed separately or corporately. I believe that at different times these have been produced as an OROX group or individually by species.

[KristenOmori-NOAA]

Hi Ned, Sharpchin is separate and for the others it can be individual species or combined in one group. Maybe separate species for ease moving forward? Thank you again! Kristen

On Mon, Oct 16, 2023 at 3:32 PM Ned Laman @.***> wrote:

Hi Kristen- Do you want the split fractions for each species you listed separately or corporately. I believe that at different times these have been produced as an OROX group or individually by species.

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[Ned-Laman-NOAA]

Separate species it is then. I'm getting started on this now. Should have a better since of timeline by early tomorrow.

[KristenOmori-NOAA]

Thank you!

On Mon, Oct 16, 2023 at 3:40 PM Ned Laman @.***> wrote:

Separate species it is then. I'm getting started on this now. Should have a better since of timeline by early tomorrow.

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[Ned-Laman-NOAA]

Hi Kristen. I should be able to get the numbers from 2019, 2021, and 2023 for the 5 rockfish species you indicated by tomorrow morning. I will push them to AKFIN and expect they'll be able to get the new numbers up within 24 hours. If you'd like to have them directly from our Oracle tables sooner, let me know and I can help with that. I'll let you know when the numbers are available.

[KristenOmori-NOAA]

Thank you, Ned! I can wait until tomorrow for the numbers, but may reach out to you if it takes longer. Thank you again for the quick turnaround.

On Tue, Oct 17, 2023 at 4:51 PM Ned Laman @.***> wrote:

Hi Kristen. I should be able to get the numbers from 2019, 2021, and 2023 for the 5 rockfish species you indicated by tomorrow morning. I will push them to AKFIN and expect they'll be able to get the new numbers up within 24 hours. If you'd like to have them directly from our Oracle tables sooner, let me know and I can help with that. I'll let you know when the numbers are available.

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[Ned-Laman-NOAA]

Here I will attempt to provide better documentation about the history of what have been termed "split fraction" data requests.

The GOA survey has employed INPFC statistical districts in our stratified survey grid and sampling design for the last few decades. These statistical districts roughly match the NMFS statistical zones in the Central and Western Gulf, but are a departure from the NMFS zones in the Yakutat and southeast Alaska regions. Stock authors requested that we post-stratify our survey results from INPFC districts into NMFS statistical zones. While we have been providing these results for a number of years, I will note that this post-stratification violates the sampling principles and design under which the survey data were collected and so caution should be exercised in ascribing statistical significance to any of the newly organized results. From those post-stratified results, we produce estimates of biomass and the fractions of those estimates that reside in the NFMS zones 640 and 650.

This year's request was to provide split fraction biomass estimates for harlequin, silvergray, redstripe, sharpchin, and redbanded rockfishes along with shortspine thornyhead, all as nominal or species-level records and this change was applied retroactively to the 2019 and 2021 survey years (i.e., overwriting split fractions recorded in previous year) as well as to this 2023 season's data. To achieve this, the GOA.GOA_MANAGEMENT_GROUPS lookup table that governs the grouping of taxa in the post-stratification scheme had to be modified so that the rockfishes which were formerly part of composite groups were nominally called out to be summarized at the species level instead. Once the lookup table was modified, the standing SQLPlus code (found here: G:\GOA\biomass_sizecomp_scripts\biomass\biomass.split.sql - last modified 10/27/2011) was run to generate the post-stratified biomass estimates and split fractions.

Current and historic membership in the composite "other rockfish" groups (OROX) was provided by Kristen Omori:

Tier 4: sharpchin

NEW Tier 5 Groups: harlequin (M=0.092) redbanded (M= 0.06) redstripe (M= 0.1) silvergray (M=0.05)

OLD Tier 5 Groups: OROX_M0092 = harlequin OROX_M01 = redstripe OROX_M007 = greenstriped, darkblotched, yellowtail OROX_M006= redbanded, pygmy, yellowmouth, bocaccio, splitnose, vermillion, stripetail, blackgill, chilipepper OROX_M005= silvergray, widow

Hope this clarifies the Tier 5 OROX old groups with the new groups.

Implications of this change -

It is not presently possible with the existing infrastructure to reproduce the overwritten computational values from previous survey years because versioning of previous group membership has not been maintained within the Oracle tableset used to generate these results. With the history provided by Kristin above, it might be possible to reconstruct previous groupings it we know which years which groups were in play.

There are 3 important paradigm shifts coming for the next Gulf survey in 2025 which will begin to make this special data request obsolete.

1 - the Gulf of Alaska survey area will be restratified in 2025 and statistical strata will be aligned with NMFS zones instead of INPFC districts so that post stratification will no longer be necessary 2 - we will be producing biomass estimates at the identification or species code level such that all taxa identified will have estimates and be made available to requesters. Requesters will then be able to create their own groupings from the component identifications as necessary for their analyses 3 - unlike previous years when Gulf (and Aleutian) design-based estimates were created solely for the current survey year, we will now be recomputing biomass for all survey years each year when we make a production run of index creation

[kechave]

Hi Ned- Similar to Kristin's request, I am needing split fraction biomass estimates for just shortraker rockfish. We are looking at possible management alternatives which unfortunately includes needing to split up WY and EY/SE. It looks like these are currently combined with rougheye?

Thanks! katy

[Ned-Laman-NOAA]

For Katy's request, I will separate shortraker rockfish from the rougheye-blackspotted rockfish complex and compute split biomass fractions for those two entities. Like with Kristen's request, this currently entails altering the grouping variables in the GOA.GOA_MANAGEMENT_GROUP tables and there is not presently any infrastructure to preserve these changes or the versioning associated with different runs of the estimation code and grouping variables.

Katy provided some additional historical context for the split fractions discussion: Once trawling was shut down east of 140 W longitude, the "split fraction" was created to allocate sablefish catch in trawl gear in the EGOA.

[Ned-Laman-NOAA]

As of today, both Kristen and Katys' requests have been met by me providing them with csvs of the split fractions. Kristen's request has been promoted to AKFIN as of yesterday, but Katy's still needs to be pushed to the public-facing database.