RKC Mark Recapture Update 2013: Excursion/St. James 2014: Pybus 2015: Seymour Canal.

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Presentation transcript:

RKC Mark Recapture Update 2013: Excursion/St. James 2014: Pybus 2015: Seymour Canal

St. James 2013 Mark: 167 pot lifts, 36 crab tagged. Not enough tagged to produce a viable estimate.

Excursion 2013 Mark: 206 pot lifts, 198 crab marked. Recapture: First attempt- Two boats canceled. Second attempt - 95 pot lifts for 11 legal males (no tags), Trip terminated early because the head of the inlet was froze over. Third attempt- 28 pots set with a 48hr soak (concentrated in the areas that were previously froze over) for 52 legal crab one of which was a recapture. Unfortunately many crab showed sings of recently molting.

Pybus 2014 Mark: Two boats, 244 pots hauled, 590 crab tagged. Recapture: One boat, 586 crab caught from 100 pots, 36 recaptures. Adjustment: 3.9 times the CSA Previous adjustment from 2010 – 3.02 Funding cut.

Seymour 2015 Mark: Two boats, two separate trips, two weeks apart. 314 pots, 2091 crab tagged Recapture: Five weeks after mark, 107 pots, 153 crab caught, 6 recaptures.

Issues Such a low overall catch of tagged crab in recapture event points to violations of the assumptions for this estimate. – Crab are not in the same locations as when the mark occurred. – Crab could be moving out of the sampling area therefore violating the idea that this is a "closed population" – Movement of crab out of the sample area would also bias the population estimate.

Where we are at now. Possibility of using a portion of the second mark as the recapture. (506 caught, 24 tags) The adjustment factor is at least 5 times more than the CSA in Seymour. (2015 CSA 29,062lbs.) We are still working on analysis to determine the correct adjustment factor to use.

Thanks to all the vessels that participated. F/V Chikamin F/V Morgan Anne F/V Angjenl F/V Sundance F/V Haakon F/V Outlook F/V Aleutian Dream F/V Guardian F/V Pillar Bay And all their crew!