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EU Craft Project: Cod Light Tech Light Scanning Results Collafirth and Vidlin Sites 12-9-06 Scanning Provided by IoA, University of Stirling

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Ambient Light Daytime Scan (W m -2 )

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CCL Horizontal Intensity Scan (W m -2 ) NOTE: scan performed on clean CCL unit. NOTE: Comparisons are made with Metal Halide lights from data for other sites.

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CCL Performance: Site comparisons

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Site Descriptions Collafirth 20 x 100w CCL 1.5m under surface, 0.5m between units ~15m deep 30m diam circles Conical net ~60,000 0.9kg cod/cage Vidlin 6 x 400w Metal Halide Four @ 4m Two @ 8m depth ~15m deep 30m diam circles Cut-down Volume net ~10,000 2.5kg cod/cage

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Position of Light measurements Measurements at 2m intervals along each transect line (broken line) Transect lines denote direction of scans for interpretation from figures Depth readings taken at 1m intervals from surface to cage floor All results watts/m 2 5m

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Effect of Bio-fouling? NOTE: Before making intensity comparison between sites, CCL units had between 5-7weeks bio-fouling accumulation, undoubtedly will have had significant effects on profiles obtained for working cages.

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Surface Note: red line denotes approximate cage circumference for the given depth Note: average intensity and variation at each depth given in bold type below 0.0021 ± 0.0080 W/m 2 0.0043 ± 0.0021 W/m 2

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1m Depth Note: red line denotes approximate cage circumference for the given depth 0.0018 ± 0.0025 W/m 2 0.0033 ± 0.0012 W/m 2

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2m Depth Note: red line denotes approximate cage circumference for the given depth 0.0033 ± 0.0036 W/m 2 0.0029 ± 0.0008 W/m 2

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3m Depth Note: red line denotes approximate cage circumference for the given depth 0.0037 ± 0.0026 W/m 2 0.0048 ± 0.0039 W/m 2

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4m Depth Note: red line denotes approximate cage circumference for the given depth 0.0063 ± 0.0059 W/m 2 0.0260 ± 0.0177 W/m 2

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5m Depth Note: red line denotes approximate cage circumference for the given depth 0.0058 ± 0.0038 W/m 2 0.0589 ± 0.0469 W/m 2

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6m Depth Note: red line denotes approximate cage circumference for the given depth 0.0032 ± 0.0021 W/m 2 0.0390 ± 0.0242 W/m 2

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7m Depth Note: red line denotes approximate cage circumference for the given depth 0.0017 ± 0.0009 W/m 2 0.0397 ± 0.0358 W/m 2

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8m Depth Note: red line denotes approximate cage circumference for the given depth 0.0018 ± 0.0014 W/m 2 0.0663 ± 0.0651 W/m 2

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9m Depth Note: red line denotes approximate cage circumference for the given depth 0.0011 ± 0.0011 W/m 2 0.0362 ± 0.0257 W/m 2

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10m Depth Note: red line denotes approximate cage circumference for the given depth 0.0010 ± 0.0009 W/m 2 0.0284 ± 0.0123 W/m 2

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