FRV Clupea 0295C

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Clupea (74CU)
Cruise identifier0295C
Cruise period1995-01-30 — 1995-02-11
Port of departureFraserburgh, United Kingdom
Port of returnFraserburgh, United Kingdom
Objectives1. To measure light distribution in and around the trawl for modelling the visual stimulus (Mr Kim).
2. To observe the behaviour of fish in experimental extensions in order to quantify escape behaviour and encounter rate. Insufficient TV observations were made.
3. To observe the behaviour of fish in the same extenstion arrangements in dark conditions using the TUV fitted with the Simrad scanning sonar and a new low light level flash TV system.
4. To assess small fish escape routes at night using small mesh pocket covers.
5. To assess the potential of flow guidance devices in aiding the passage of fish attemping to swim through meshes. Not attempted due to lack of time. Not attempted due to lack of time.
Chief scientistClem S Wardle (Scottish Office Agriculture Environment and Fisheries Department Aberdeen Marine Laboratory)
Cruise reportFRV Clupea 0295C cruise report cl2_95.pdf (0.06 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificMoray Firth or Orkney Islands
Physical oceanography 
Optics (eg underwater light levels)Description: Measuring light distribution in and around the trawl.
Biology and fisheries 
Other biological/fisheries measurementQuantity: number of hauls = 28
Description: to advance knowledge of the difference between night and day escape distributions and the different reaction behaviours.