FRV Clupea 0704C

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Clupea (74CU)
Cruise identifier0704C
Cruise period2004-04-26 — 2004-05-07
Port of departureFraserburgh, United Kingdom
Port of returnFraserburgh, United Kingdom
Objectives1. To use the Seabat multibeam sonar and low light camera to make an assessment of possible areas where fish escapes occur through the large mesh top sheet of BT187. The Seabat sonar will be mounted onto the RCTV.
2. To use self-recording ccd cameras attached to BT187 to assess Nephrops escapes through three different belly sheet rigging configurations all 2 m wide by 8 m deep; reduced number of meshes back from bosom section, replace 80 mm with 160 mm diamond meshes and flexi-grid panel with 35 mm bar spacing.
3. To assess the feasibility of attaching a 40 mm collection bag below the belly of BT187 to collect escapees through the 2 m by 8 m modified belly sheet.
4. To observe the rigging and fish escapes over the cut back headline of a modified Stuarts Nephrops trawl supplied by Seafish.
5. To observe the rigging and fish reactions to an inclined separator panel rigged with a small mesh collection bag inserted into the trawl between the end of the last tapered section and straight extension.
Chief scientistRobert J Kynoch (Fisheries Research Services Aberdeen Marine Laboratory)
Cruise reportFRV Clupea 0704C cruise report 0704c.pdf (0.05 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificMoray Firth
Biology and fisheries 
Acoustic reflection on marine organisms.Description: 20 miles NW of Fraserburgh data for objective 1 was collected.
Gear researchDescription: Nephrops escape rates were measured.
Geology and geophysics 
Bottom photographyDescription: RCTV was re-rigged during the cruise.
Multi-beam echosoundingDescription: 20 miles NW of Fraserburgh data for objective 1 was collected.