Cruise inventory

RV Corystes COR4/03

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corystes (74RY)
Cruise identifierCOR4/03
Cruise period2003-03-19 — 2003-03-28
StatusCompleted
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
PurposeResearch
ObjectivesThe aims of this cruise were to (1) describe the impacts of trawling disturbance on the structure and productivity of benthic communities (2) examine the effects of fishing on the trophic structure of fish communities and (3) identify new sites in the central and northern North Sea for assessing the effects of fishing on the environment.
1. To sample infaunal and epifaunal invertebrates at a series of sites subject to different levels of trawling disturbance for production studies. This objective was not met in full because the NIOZ corer and coring wire were lost and because the replacement corer was inoperative.
2. To sample infaunal and epifaunal invertebrates and fish at a series of sites subject to different levels of trawling disturbance for food web studies. This objective was met for invertebrates and fish in the North West Rough area and for fish in four additional boxes at Devils Hole, the Hills, Barmade Bank and Indefatigable. The work if the Fladen Ground was not progressed due to the loss of the NIOZ corer and the absence of a replacement coring wire.
3. To survey sites in the central and northern North Sea with side scan sonar in an attempt to locate new areas for the study of fishing impacts. This objective was met in full.
4. To collect fish and benthic invertebrate species for stable isotope analysis. This objective was largely met.
Chief scientistSimon Jennings (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)
Cruise reportRV Corystes COR4/03 cruise report cory4_03.pdf — access key 'C' (0.22 MB) 
Ocean/sea areas 
GeneralNorth Sea
Measurements 
Biology and fisheries 
ZoobenthosQuantity: number of stations = 3
Description: worked using a benthic dredge.
ZoobenthosQuantity: number of stations = 7
Description: infauna sampled using a NIOZ corer.
Demersal fishQuantity: number of hauls = 50
Description: made using both a 4m beam trawl (20 tows) and a 2m beam trawl (30 tows). The tows were made to study the benthic food web.
Demersal fishQuantity: number of stations = 7
Description: Epifauna sampled with a 2m beam trawl.
Geology and geophysics 
DredgeQuantity: number of stations = 3
Description: worked using a benthic dredge.
Long/short range side scan sonarQuantity: number of stations = 7
Description: surveyed using side-scan sonar.