Detailed visual seabed survey at drilling site 7218/11-1

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Figure36. Observationsfor the bluespongeHymedesma, Darwin,August2012. 5.3.6 Trawl tracks Figure 37 shows the distribution of trawl tracks at the Darwin field, August,2012. Evidenceof trawling existsthroughout the area.Trawltrackswere observedat almosthalf of all the ROVsurvey lines. A total of 19 observationsof trawl tracksweremade. Akvaplan-niva AS, 9296 Tromsø 44 www.akvaplan.niva.no
Figure37. Observationsof trawl tracksat the Darwinfield,August,2012. 5.3.7 General impressions (images) During the course of the survey, it becameclear that the Darwin area supports a healthy fish population (Figure38). Fishspeciesobservedwere saithe (Pollachiusvirens), Atlantic cod (Gadus morhua), spottedwolfish (Anarhichasminor), redfish(Sebastes) anda variety of others.Fishtend to become numerous at the sea floor, and attracted to the ROVlights from early in the morning, approximately4am (pers. com. Knut Bergen,OceaneeringROVsupervisor),and this also was the casein the presentsurvey. Detailed site survey at PL531 Darwin Akvaplan-niva AS Rapport 6051 - 1 45
Page 1 and 2: Detailed visual seabed survey at dr
Page 3: Akvaplan -niva AS Rådgivning og fo
Page 6 and 7: List of figures and tables FIGURE1.
Page 8 and 9: Preface In August,2012,Akvaplan-niv
Page 10 and 11: Figure2. ROVtransectsandrecordsof s
Page 12 and 13: 2 Materials and methods 2.1 Vessel
Page 14 and 15: 2.3 Survey track and waypoints Thep
Page 16 and 17: Akvaplan-niva haspreviouslyworked w
Page 18 and 19: Figure7. Over4 tonnesof sponges(pre
Page 20 and 21: Figure10. BarentsSea.Spongebycatchi
Page 22 and 23: Somespongesform densereefs,and prov
Page 24 and 25: Figure14. Photosfrom Mercier(2012)s
Page 26 and 27: Figure16. Imagefrom Salina,2010,cla
Page 28 and 29: It is clear that Cochraneadopted a
Page 30 and 31: 5.2 Seafloor conditions 5.2.1 Sedim
Page 32 and 33: 5.3.2 Plots of sponge distribution
Page 34 and 35: Figure24. Locationof the 30 imagess
Page 36 and 37: Position16. 0-1 % coverage Position
Page 38 and 39: Position15. 1-5 % coverage.Geodiaan
Page 40 and 41: 5.3.3 Overall assessment of sponge
Page 42 and 43: 5.3.5 Dominant sponge species recor
Page 44 and 45: Hymedesmia Hymedesmia Polymastia Po
Page 46 and 47: Figure34. Observationsof the yellow
Page 50 and 51: Figure38. Upper:spottedwolffishrest
Page 52 and 53: Figure40. Largestonein foreground,w
Page 54 and 55: Table 6. Summaryof environmentalcos
Page 56 and 57: 5.4.2.2 Deposition Case 2: to seafl
Page 58 and 59: 5.4.2.4 Deposition Case 7: Depositi
Page 60 and 61: 5.4.3 Comparative assessment Table7
Page 62 and 63: 6 References Auster, P.J. 2007. Lin
Page 64: Appendices Anelectronicsupplement(o

Detailed visual seabed survey at drilling site 7218/11-1

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