Cruise summary report
Cruise Info. | |
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Ship name | Salar |
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Cruise identifier | Part 1 |
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Cruise period | 1990-07-29 — 1990-08-25 |
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Status | Completed |
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Port of departure | Gairloch, United Kingdom |
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Purpose | Fisheries |
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Objectives | Joint cruise with the Heathery Brae
Aims:
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.
Narrative:
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.
Results:
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. |
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Chief scientist | John Main (Scottish Office Agriculture and Fisheries Department Aberdeen Marine Laboratory) |
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Cruise report | (0.10 MB) |
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Ocean/sea areas | |
General | Inner Seas off the West Coast of Scotland |
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Specific | Gairloch, Scotland |
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Measurements | |
Biology and fisheries | |
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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. |