{"id":9697,"date":"2019-05-16T10:30:32","date_gmt":"2019-05-16T09:30:32","guid":{"rendered":"https:\/\/blogs.gov.scot\/marine-scotland\/?p=9697"},"modified":"2019-05-10T14:03:23","modified_gmt":"2019-05-10T13:03:23","slug":"smolt-trawl-survey-sunbeam","status":"publish","type":"post","link":"https:\/\/blogs.gov.scot\/marine-scotland\/2019\/05\/16\/smolt-trawl-survey-sunbeam\/","title":{"rendered":"Smolt Trawl Survey with the Sunbeam"},"content":{"rendered":"

MFV Sunbeam FR487<\/strong><\/h4>\n

Survey<\/strong>: 1419H Programme<\/p>\n

Duration<\/strong>: 10-19 May 2019<\/p>\n

Scientific Gear<\/strong>:<\/p>\n

    \n
  1. Smolt trawl, Thyboron type 15vf pelagic trawl doors (6m2), Dyneema sweep rig and Fenders (300mm diameter with 215kg buoyancy) attached four per side of the trawl.<\/li>\n
  2. Video frame\/box incorporating pit tag detector.<\/li>\n
  3. Self-contained underwater camera systems.<\/li>\n
  4. New \u00c5krehamn Tr\u00e5lb\u00f8teri fish-lift aquarium system incorporating grid box and aluminum live fish aquarium.<\/li>\n<\/ol>\n

    Objectives<\/strong><\/h4>\n

    To undertake a smolt trawl survey in the outer Moray Firth, and elsewhere off the Scottish east coast, including offshore from the Firths of Tay and Forth.<\/p>\n

    Procedure<\/strong><\/h4>\n

    All trawl gear, video-frame, fish-lift aquarium and scientific equipment will be transported to Fraserburgh and rigged aboard the MFV Sunbeam. The vessel will set sail and make passage to commence the smolt survey on the Scottish east coast or, if the weather is unfavourable, in the Moray Firth area.<\/p>\n

    Trawl Gear<\/strong><\/h4>\n

    The smolt trawl is designed to operate with its headline held at the surface and the footrope at approximately 12 m depth. The headline and top sweeps of the net are supported using 50 x 200 mm floats (headline), 2 x 1400 mm long fender floats at net quarters and 1 x Polyform A6 fender buoy + 2 x 1400 mm long fender floats per side (top sweep). The trawl doors are designed to fish just below the surface (max depth 50-60 m) and buoyant Dyneema rope used throughout the sweep rig. The video frame is attached to the trawl using netting with supporting bridles and made neutrally buoyant using a combination of 275 mm and 200 mm floats. (A rigging specification is given in Guidance Note 1<\/em><\/strong>.)<\/p>\n

    The fish-lift aquarium system will replace the video-frame system at the rear of the smolt trawl. It is a closed aluminum boat shaped aquarium and designed to produce the lowest possible turbulence inside and, therefore, allows the fish caught inside to swim unharmed and is an improved version of a fish-left aquarium designed by Holst and McDonald, 2000 (see Guidance note 2<\/em><\/strong>).<\/p>\n

    Trawling Plan<\/strong><\/h4>\n

    This survey will build on the successful 2017-2018 survey work in the Moray Firth and elsewhere off the Scottish east coast. The 2019 survey will further investigate the migration routes of salmon and sea trout smolts from Moray Firth rivers across the Moray Firth and carry out the second survey of smolts off the Firths of Tay and Forth (see main picture). There is also potential to investigate further offshore in informative locations. The net requires a minimum depth of about 40 m for operation and is deployed in an arc, or arcs, so that the ship wash misses the net.<\/p>\n

    Tows of two hours or less will be carried out with a cod end in place and smolts retained for genetic assignment to rivers and\/or regions of origin. The by-catch will be recorded by species. The captured video and PIT tag recordings will be used to identify when fish were caught during the tows. It is also possible that the net will also be deployed open ended at times, instead of using a cod end, potentially for longer tows, but not providing samples for genetic assignment. A combination of tows with and without the cod end in place may allow survey work to be carried out for up to 16 hours a day.<\/p>\n

    If available, the fish-lift system will be deployed to retain smolts in better condition, and allow smolts, not required for sampling, to be returned alive to the sea after minimal contact.<\/p>\n

    Guidance Note 1. Smolt Trawl Rig Details<\/strong><\/h4>\n

    Trawl (4 panel constructed from PA netting)<\/strong>
    \n\u2022 Mesh size (Full mesh in mm):<\/strong>
    \no Wings – 800
    \no Front\/side panel sections \u2013 800
    \no Lower cover\/belly sections \u2013 800
    \no Reducing 400-200-120-80-60 and end taper 40
    \no Straight extension \u2013 40<\/p>\n

    \u2022 Frame lines and net opening<\/strong>
    \no Headline length \u2013 70.2 m
    \no Side line length \u2013 15.9 m
    \no Footrope length \u2013 59.8 m
    \no Wing stretch length (nominal) \u2013 62 m
    \no Trawl tapered body stretched length (nominal) \u2013 69.6 m
    \no Straight extension stretched length \u2013 8 m
    \no Fishing circle \u2013 224 m
    \no Nominal net mouth opening at fishing circle (assumes meshes roped (hung) at 50% of full mesh size) \u2013 844.8 m2.<\/p>\n

    Sweep rig and otterboards<\/strong>
    \n\u2022 Sweeps \u2013 150 m x 28 mm dia. Dyneema
    \n\u2022 Backstrops \u2013 15 m x 28 mm dia. Dyneema
    \n\u2022 Headline\/footrope extensions \u2013 3m x 13mm long-link chain
    \n\u2022 Otterboards \u2013 Thybor\u00f8n type 15vf pelagic otterboards:
    \no Surface area \u2013 6m2
    \no Weight (each otterboard) \u2013 1000kg + 200kg additional (8 x 25kg)<\/p>\n

    Flotation (headline)<\/strong>
    \n\u2022 50 x 200mm floats (each float 2.47kg buoyancy)
    \n\u2022 1 x Polyform (A2) H= 510mm Dia.= 300mm Buoyancy = 35kg
    \n\u2022 Fenders (Blue Line JF2255):
    \no 1 per side at quarters – L = 1400mm \u00d8 = 300mm buoyancy = 215kg
    \n2 per side at wingends (attached to chain extensions) – L = 1400mm \u00d8 = 300mm buoyancy = 215kg + 1 per side Polyform A6 buoy fender L = 111.8cm x \u00d8 = 86.4cm buoyancy = 359kg<\/p>\n

    Guidance Note 2 \u2013 Fish-Lift Aquarium Schematic<\/strong><\/h4>\n

    \"1419H<\/a><\/p>\n

    (Taken from J.C. Holst, A. McDonald\/Fisheries Research 48 (2000) 87-91<\/em>)<\/h4>\n","protected":false},"excerpt":{"rendered":"

    MFV Sunbeam FR487 Survey: 1419H Programme Duration: 10-19 May 2019 Scientific Gear: Smolt trawl, Thyboron type 15vf pelagic trawl doors (6m2), Dyneema sweep rig and Fenders (300mm diameter with 215kg buoyancy) attached four per side of the trawl. Video frame\/box incorporating pit tag detector. Self-contained underwater camera systems. New \u00c5krehamn Tr\u00e5lb\u00f8teri fish-lift aquarium system incorporating…<\/p>\n","protected":false},"author":118,"featured_media":9706,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14,15,131,20],"tags":[605,61,203,603,172,156,257,106,749,601,161,631,406],"class_list":["post-9697","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fisheries","category-general","category-mss","category-marine-scotland-surveys","category-research-vessel-surveys","tag-cod-end","tag-firth-of-forth","tag-fisheries","tag-mfv-sunbeam","tag-moray-firth","tag-research","tag-salmon","tag-sampling","tag-sea-trout","tag-smolt","tag-survey","tag-tay","tag-trawling"],"yoast_head":"\nSmolt Trawl Survey with the Sunbeam - Marine<\/title>\n<meta name=\"description\" content=\"Marine Scotland will be undertaking a smolt trawl survey in the outer Moray Firth and elsewhere off the Scottish east coast.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.gov.scot\/marine-scotland\/2019\/05\/16\/smolt-trawl-survey-sunbeam\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Smolt Trawl Survey with the Sunbeam - 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