Salar Part 1
Cruise summary report
|Cruise identifier||Part 1|
|Cruise period||1990-07-29 — 1990-08-25|
|Port of departure||Gairloch, United Kingdom|
|Objectives||Joint 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 scientist||John Main (Scottish Office Agriculture and Fisheries Department Aberdeen Marine Laboratory)|
|Cruise report||(0.10 MB)|
|General||Inner Seas off the West Coast of Scotland|
|Biology and fisheries|
|Demersal fish||Quantity: 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.
|Demersal fish||Quantity: 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 fish||Quantity: 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.