Cruise inventory

Salar Part 1

Cruise summary report

Cruise Info. 
Ship nameSalar
Cruise identifierPart 1
Cruise period1990-07-29 — 1990-08-25
Port of departureGairloch, United Kingdom
ObjectivesJoint cruise with the Heathery Brae

1. To investigate the survival rates (in underwater cages) of cod, haddock and whitin escaping from cod-ends of 90x120mm meshes round, 90x100mm meshes round and 90mm with a 80mm square mesh top panel
2. To obtain selectivity data for each cod-end.

The underwater cages were transported by the scallop dredger Salar to a position on the east side of Longa Island during the first week. Also during this first week haddock, whiting and codling were caught on handline and kept in 3 of the cages as controls. Fish caught by the Heathery Brae which escaped through the cod-end meshes were transported to the cages.

Survival percentage after 19 days in the underwater cages:
90x120mm: haddock 42%; whiting 93%; cod 96%
90X100mm: haddock 94%; whiting 82%; cod 100%
90 with 80mm: haddock 76%; whiting 94%; cod 100%

After 29 days only 1 more whiting had died. No further deaths during the next 12 days.
Fish whos scales started to deteriorate usually died within a few days.
Chief scientistJohn Main (Scottish Office Agriculture and Fisheries Department Aberdeen Marine Laboratory)
Cruise reportSalar Part 1 cruise report heathery_braeandsalar_jul90.pdf — access key 'C' (0.10 MB) 
Ocean/sea areas 
GeneralInner Seas off the West Coast of Scotland
SpecificGairloch, Scotland
Biology and fisheries 
Demersal fishQuantity: number of hauls = 1
Description: Extra hauls had to be made to boost the number of codling needed for the cage experiments. No. of hauls not specified.
Demersal fishQuantity: activity duration in days = 11
Description: Within this period small haddock, whiting and codling were taken. Fish escaping the codend mesh were retained for survival experiments.
Demersal fishQuantity: activity duration in days = 7
Description: During the 1st week haddock, whiting and codling were caught on handlines and kept in cages as controls for the experiment.