Cruise inventory

FRV Clupea 1089C

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Clupea (74CU)
Cruise identifier1089C
Cruise period1989-08-21 — 1989-09-08
StatusCompleted
Port of returnAberdeen, United Kingdom
PurposeResearch
Objectives1. To investigate likely herring spawning areas in ICES areas IVa (west) and IVb (west) using a "Day" grab, the ROV "Sea-pup", a commercially available ROV and the sledge-mounted underwater TV system - in an attempt to pinpoint exact herring spawning locations.
2. To carry out TV and bottom substrate surveys in Oil Exploration Blocks 5/24, 5/25, 6/30 and 26/4 which lie in areas identified as extremely important herring spawning grounds.
3. To map and sample quantitatively the herring spawning ground discovered off Rattray Head in August/September 1988 and any other areas of egg deposition that are identified.
4. To assess the usefulness of a commercially available ROV for this type of work.
5. To carry out a limited amount of fishing to obtain biological samples of fish occurring on the spawning grounds.
Chief scientistJohn A Morrison (Scottish Office Agriculture and Fisheries Department Aberdeen Marine Laboratory)
Cruise reportFRV Clupea 1089C cruise report cl10_89.pdf — access key 'C' (0.15 MB) 
Ocean/sea areas 
GeneralNorth Sea
Specificoff Rattray Head
Measurements 
Biology and fisheries 
Eggs and larvaeQuantity: number of hauls = 2
Description: Dutch Gulf III deployed to collect samples of larvae.
Demersal fishDescription: Limited amount of fishing for herring.
Geology and geophysics 
GrabQuantity: number of samples = 275
Description: grab samples to characterise bottom substrates observed on video.
Bottom photographyDescription: Underwater TV to locate herring spawning grounds.