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

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

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Akvaplan -niva AS<br />

Rådgivning og forskning innen miljø og akvakultur<br />

Org.nr: NO 937 375 158 MVA<br />

Framsenteret<br />

9296 Tromsø<br />

Tlf: 77 75 03 00, Fax: 77 75 03 01<br />

www.akvaplan.niva.no<br />

Report title<br />

<strong>Detailed</strong><strong>visual</strong><strong>seabed</strong><strong>survey</strong><strong>at</strong> <strong>drilling</strong> <strong>site</strong> <strong>7218</strong>/<strong>11</strong>-1, Darwin PL 531 in<br />

the BarentsSea- with specialfocuson spongeassemblages .<br />

Author(s)<br />

SabineCochrane<br />

RunePalerud<br />

JesperHansen<br />

AnnaHelenaFalk<br />

Client<br />

RepsolExplor<strong>at</strong>ionNorwayAS(RENAS)<br />

Akvaplan -niva report no.<br />

6051– 1<br />

D<strong>at</strong>e<br />

25.09.2012<br />

No. of pages<br />

64<br />

Distribution<br />

Restricted<br />

Client’s reference<br />

SigurdHellem<br />

Summary<br />

On commissionto RENASNorway, Akvaplan-niva provided biological assistanceduring ROVsediment<br />

mappingaround the planned<strong>drilling</strong><strong>site</strong> <strong>at</strong> the Darwinprospect(PL531)in the BarentsSea, August2012.<br />

ROVfilming along a transect length of approxim<strong>at</strong>ely27 200 m was carried out, over approxim<strong>at</strong>ely17<br />

hours.Thisreport documentsthe distributionanddensitiesof the spongepopul<strong>at</strong>ionsin the area,together<br />

with other biologicalandsedimentcharacteristics.In general,the seafloorcloseto the planned<strong>drilling</strong> <strong>site</strong><br />

<strong>at</strong> the Darwinprospectcanbe characterizedasmainlycomprisedof mud, with somesc<strong>at</strong>teredstones. The<br />

area is visibly rich in bottom currents, and the visible sea-floor communitiesare domin<strong>at</strong>ed by sponges<br />

suchasGeodia,Aplysilla,Farreaoccaandassoci<strong>at</strong>edorganismssuchassqu<strong>at</strong>lobsters(Munida).<br />

Themain challengesfor spongeassessmentsare outlined, and the approachappliedduring the <strong>survey</strong>is<br />

describedin detail. Further,a summaryof st<strong>at</strong>eof knowledgeregardingspongesandmethodsof assessing<br />

spongeassemblagesisoutlined.<br />

Project manager Quality control ler<br />

SabineCochrane LarsHenrikLarsen<br />

© 2012 Akvaplan -niva AS. This report may only be copied as a whole. Copying of part of this<br />

report (sections of text, illustr<strong>at</strong>ions, tables, conclusions, etc.) and/or reproduction in other<br />

ways, is only permitted with written consent from Akvaplan -niva AS.

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