Kevin Weng, Andrew Gray, Jeff Muir, Dave Itano, Kim Holland, Mike Seki Supported by NOAA‐PIFSC. Many thanks to Bruce and Carson, FV Hoku. monchong at cross

Hawaii Mapping Research Group, SOEST cross seamount pelagic

seamount/ deep slope

Don Hawn et al. Don Hawn et al Dave Itano • key bigeye fishery • expanding monchong fishery bigeye • rising effort? NWHI bottomfish closure, bigeye catch limits monchong fisheries of cross seamount Domokos • NOAA-PIFSC: acoustics to characterize ecosystem components (Domokos)

• reversible flow patterns

(Domokos) Domokos

• diet of – micronekton (Holland, Grubbs, Drazen) ecology of cross seamount cross seamount fishery continuous effort by multiple boats pole and line, dangler, handline shortline fishery (longline methods)

protected species • stock structure - residence time • behavior – efficient fishing – reduced bycatch, eg sharks monchong at cross seamount

array No. Monchon g Cruise days Tagged Notes Apr 7 6 Deploy acoustic receiver array 201 00 May 15 0 Fishing not good, no monchong 2010 tagged, primarily due to high current Sept 7 9 Fishing slow 2010 Apr 7 19 Retrieve acoustic array and redeploy. 2011 Station 5 lost. Good fishing. tagging to date returned data for6 of 9fish

number of hits left and came back chased to surface, tag fell to bottom

intermittent visitor?

awesome

dead

intermittent visitor?

intermittent visitor? data interpretation, qc data after qc stock structure, residence 6 months (life of tag)

residence 4.5 months depart, return • ppyreliminary results indicate lon g residence • movements away from seamount • connectivit y with other deep demersal habitats unknown stock structure: need more data behavior monchong ascend at night full moon shallow behavior depth time series southnorth south south north north south north

depth time series dawn day dusk night

18 april – 20 may : south dawn day dusk night

21 may – 5 july : north • anticyclonic flow advects zooplankton into area, attracting micronekton

• increased currents correspond to higher micronekton biomass

2005 2007 2008 22ºN

20N

18ºN Cross Seamount 160ºW 158ºW 156ºW 160ºW 158ºW 156ºW 160ºW 158ºW 156ºW

< -25-20-15 -10 -5 0 5 10 15 20 > 25 sea level anomaly (cm) Reka Domokos et al PIFSC Oceanwatch Server

Apr 15 May 20 Jul 8 Jul 22 Aug 12

SSH + geostrophic currents • detailed diel /// lunar / mesoscale behavioral patterns • interpretation of NOAA acoustic surveys • efficient fishing • reduction in lost gear, negative impacts behavior and fishing • will download data for 19 fish this sppgring • longer tag lifespans - residence • reltilationshi p with physi cal envi ronment • compare with acoustics data future work • Thanks to FV Hoku – Bruce, Carson et al. • Funded by NOAA – PIFSC • Than ks to DdiDodie Lau, JhJohnoe lAhtAncheta thanks ! hycom+ncoda @ 300m, 20 Apr monchong on south

20 apr