Marine Scotland

Deploying fish traps and underwater video camera frames

September 3, 2018 by No Comments | Category Uncategorized

Survey: 1218H – MRV Actinia

Duration: 2-7 September 2018

Fishing Gear:

  • 12 fish traps (6 fleets of 2 traps)
  • 2 baited remote underwater video camera (SBRUV) frames
  • 4 LED light assemblies in GPH housing
  • 4 SJ6 Legend cameras and custom-built underwater housings

Objectives:

  1. To deploy fish traps over various habitat types within and around the South Arran MPA.
  2. To synchronously deploy baited remote underwater video camera frames fitted with twin cameras calibrated for post-survey photogrammetric analysis.

Procedures:

Fish Trap Survey: Traps will be deployed and recovered each day following a minimum soak time of six hours. The approximate positions of each end marker buoy (GPS latitude and longitude), depth (m), soak time, and bait type and quantity will be recorded. Captured fish will be released from each trap, placed inside individually labelled bags, and frozen.  Otoliths from gadoid species (cod, haddock, whiting and saithe) will be extracted back at the lab.

In addition, a small hand-held drop frame will be used to deploy a GitUp Git 2 action camera and LED Electralume light in the immediate vicinity of the fish traps. Recorded footage will be used to verify the substrate types over which the traps are positioned.

Trap station positions are shown in Figure 1 and are derived from the midpoints of those sampled during the previous survey. Latitude and longitude coordinates and depth in metres are given in Table 1a.

Stations will be surveyed depending on the prevailing weather conditions i.e. if wind strengths or wave heights are adverse, a precautionary approach will be adopted and those with adequate shelter from the weather will be selected.

SBRUV Survey: Baited stereo-camera station positions are shown in Figure 1. Latitude and longitude coordinates and depth in metres are given in Table 1b.  Each underwater camera frame will be deployed a distance sufficient to avoid any interaction with the fleet ground gear (minimum 500 m between deployments).  Two cameras oriented approximately ±6° perpendicular to the frame base will record high definition video (1080p @ 60 fps) for a nominal period of 1.5 hours.  Footage will be downloaded to external media at the end of each working day.  Species identification, relative density (MaxN) and substrate type (assessed visually) will be classified post-survey.

Further Information:

Figure 1:  Positions of fish trap and SBRUV frame deployment stations. ABC = algal-boulder-cobble; AGP = algal-gravel-pebble

Table 1a: Latitude, longitude and depth of fish trap stations.

Station Latitude (dd) Longitude (dd) Latitude (degree decimal minutes) Longitude (degree decimal minutes) Depth (m)
FT_SA_30 55.571834 -5.105522 055° 4.30980’N 005° 6.33120’W 8.1
FT_SA_28 55.541795 -5.0821525 055° 2.50800’N 005° 4.92900’W 16.4
FT_SA_29 55.5425765 -5.0949135 055°32.55480’N 005° 5.69460’W 19.5
FT_SA_26 55.529817 -5.1163075 055° 1.78920’N 005° 6.97860’W 29.0
FT_SA_24 55.5222455 -5.109445 055°31.33500’N 005° 6.56700’W 19.8
FT_SA_23 55.5135705 -5.0803365 055° 0.81420’N 005° 4.82040’W 24.6
FT_SA_02 55.483715 -5.355521 055° 9.02260’N 005° 21.33120’W 21.8
FT_SA_01 55.48774 -5.3400675 055° 9.26440’N 005°20.40420’W 7.7
FT_SA_03 55.4702175 -5.348869 055° 8.21320’N 005°20.93220’W 21.4
FT_SA_04 55.454247 -5.3239035 055° 7.25500’N 005° 9.43400’W 10.9
FT_SA_05 55.4197675 -5.2975295 055°25.18620’N 005° 17.85180’W 26.6
FT_SA_06 55.4252095 -5.27796 055° 5.51260’N 005° 16.67760’W 23.9
FT_SA_07 55.436956 -5.273633 055° 6.21760’N 005° 16.41780’W 10.1
FT_SA_09 55.4305955 -5.2456235 055° 5.83600’N 005° 4.73720’W 11.7
FT_SA_08 55.4236585 -5.2309865 055° 5.41960’N 005° 3.85940’W 26.1
FT_SA_10 55.434217 -5.163025 055° 6.05320’N 005° 9.78180’W 12.2
FT_SA_11 55.431344 -5.1419955 055° 5.88040’N 005° .52000’W 16.7
FT_SA_12 55.42086 -5.1424225 055° 5.25160’N 005° 8.54520’W 19.1
FT_SA_22 55.514989 -5.0921875 055° 0.89940’N 005° 5.53140’W 33.0
FT_SA_21 55.5021825 -5.079309 055° 0.13080’N 005° 4.75860’W 9.0
FT_SA_19 55.492743 -5.0838765 055° 9.56440’N 005° 5.03280’W 15.5
FT_SA_17 55.4827305 -5.0838915 055° 8.96380’N 005° 5.03340’W 22.5
FT_SA_15 55.472405 -5.0793065 055° 8.34460’N 005° 4.75860’W 18.0
FT_SA_13 55.4435285 -5.088031 055° 6.61180’N 005° 5.28180’W 21.2
FT_SA_25 55.5285975 -5.107335 055° 1.71600’N 005° 6.43980’W 31.8
FT_SA_27 55.529768 -5.0920965 055° 1.78620’N 005° 5.52600’W 24.7
FT_SA_20 55.4970525 -5.0847825 055° 9.82300’N 005°5.08680’W 6.9
FT_SA_18 55.4892025 -5.0873585 055° 9.35200’N 005° 5.24160’W 10.5
FT_SA_16 55.4790105 -5.083323 055° 8.74060’N 005° 4.99920’W 20.3
FT_SA_14 55.463094 -5.0743115 055° 7.78540’N 005° 4.45860’W 13.3

Table 1b: Latitude, longitude & depth of SBRUV stations.

Station Latitude (dd) Longitude (dd) Latitude (degree decimal minutes) Longitude (degree decimal minutes) Depth (m)
BUC_SA_30 55.5676598 -5.100325216 055°34.05960’N 005° 06.01980′ W 16.6
BUC_SA_28 55.54679263 -5.083958865 055° 32.80740’N 005° 05.03760′ W 2.8
BUC_SA_29 55.5394409 -5.10212543 055° 32.36640’N 005° 06.12780′ W 22.0
BUC_SA_26 55.5338162 -5.1109673 055° 32.02920’N 005° 06.65820′ W 23.7
BUC_SA_24 55.52674338 -5.105425626 055° 31.60440’N 005° 06.32580′ W 34.1
BUC_SA_23 55.51423771 -5.089287447 055° 30.85440’N 005° 05.35740′ W 32.0
BUC_SA_02 55.48821573 -5.359906381 055° 29.29320’N 005° 21.59460′ W 21.4
BUC_SA_01 55.48375268 -5.334356111 055° 29.02500’N 005° 20.06160′ W 8.1
BUC_SA_03 55.46981638 -5.339776718 055° 28.18920’N 005° 20.38680′ W 13.5
BUC_SA_04 55.44979116 -5.31936525 055° 26.98740’N 005° 19.16220’W 10.3
BUC_SA_05 55.421297 -5.306236871 055° 25.27800’N 005° 18.37440’W 26.3
BUC_SA_06 55.42543066 -5.268942092 055° 25.52580′ N 005° 16.13640’W 22.9
BUC_SA_07 55.439767 -5.28142077 055° 26.38620’N 005° 16.88520′ W 12.1
BUC_SA_09 55.4309735 -5.236362028 055° 25.85820’N 005° 14.18160’W 10.2
BUC_SA_08 55.4233318 -5.240229625 055° 25.39980’N 005° 14.41380’W 26.0
BUC_SA_10 55.43553868 -5.154262826 055° 26.13240′ N 005° 09.25560’W 14.0
BUC_SA_11 55.43348835 -5.134189614 055° 26.00940′ N 005° 08.05140’W 13.5
BUC_SA_12 55.42364421 -5.150338448 055° 25.41840′ N 005° 09.02040’W 25.2
BUC_SA_22 55.51915725 -5.097426641 055° 31.14960′ N 005° 05.84580’W 37.7
BUC_SA_21 55.50663853 -5.074958452 055° 30.39840’N 005° 04.49760’W 32.1
BUC_SA_19 55.49788391 -5.083097538 055° 29.87280’N 005° 04.98600’W 8.8
BUC_SA_17 55.47780046 -5.081592656 055° 28.66800’N 005° 04.89540’W 22.2
BUC_SA_15 55.47719321 -5.082298715 055° 28.63140′ N 005° 04.93800’W 18.3
BUC_SA_13 55.44770986 -5.082806917 055° 26.86260’N 005° 04.96860’W 27.8
BUC_SA_25 55.52551086 -5.100111373 055° 31.53060′ N 005° 06.00660’W 36.0
BUC_SA_27 55.52511996 -5.088283019 055° 31.50720′ N 005° 05.29680’W 34.2
BUC_SA_20 55.50177737 -5.081379485 055° 30.10680’N 005° 04.88280’W 4.3
BUC_SA_18 55.49423209 -5.086251656 055° 29.65380’N 005° 05.17500’W 7.8
BUC_SA_16 55.47418512 -5.080096623 055° 28.45140′ N 005° 04.80600’W 19.3
BUC_SA_14 55.46815219 -5.073800924 055° 28.08900’N 005° 04.42800’W 24.8

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