RRS Challenger CH7/81

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH7/81
Cruise period1981-04-28 — 1981-05-12
Port of departureArdrossan, United Kingdom
Port of returnBarry, United Kingdom
Objectives1. To continue the seasonal survey of the deep-sea demersal fish populations of the upper slopes (500 - 1250m) of the Porcupine Sea Bight using the SMBA Granton trawl.
2. To continue the seasonal survey of the deep-sea demersal fish using the Porcupine Sea Bight (500 - 4800m) using the IOS semi-balloon otter trawl (OTSB 14).
3. To trawl for demersal fish at the SMBA permanent station (2900m) on the Rockall Trough and collect the invertebrates for Dr. Gage, SMBA.
4. To collect fish samples for Dr. Pentreath (MAFF Radiobiological Laboratories, Lowestoft).
5. To collect ripe ovaries from a wide range of species for studies of egg quality by Dr. Craik, SMBA.
6. To collect specimens for the Zoological Museum, University of Hamburg; Royal Scottish Museum, Edinburgh and the University Marine Biological Station, Millport.
Chief scientistJohn D M Gordon (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH7/81 cruise report ch7_81.pdf (0.26 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificPorcupine Bight
Track chartsRRS Challenger CH7/81 cruise track — trk2633.html
Biology and fisheries 
ZoobenthosQuantity: number of hauls = 27
Demersal fishQuantity: number of hauls = 27
Description: Granton trawls to survey taxonomy, energy transfers, biomass determination and distribution.
Exploratory fishingQuantity: number of hauls = 27