Cruise inventory

FRV Alba Na Mara 1011A

Cruise plan

Cruise Info. 
Ship name (ship code)FRV Alba Na Mara (74NM)
Cruise identifier1011A
Cruise period2011-07-24 — 2011-08-10
StatusCompleted
Port of departureFraserburgh, United Kingdom
Port of returnFraserburgh, United Kingdom
PurposeFisheries
ObjectivesObjectives

1. Examine the performance of the BT199 3T trawl, by quantifying the dimensions of the entrances to the three compartments in the mouth of the trawl, and monitoring the trawls symmetry;
2. Quantify the horizontal distribution of fish entering the mouth of the net (in particular cod, megrim and monkfish) via catch rates.
3. Describe the behaviour of fish species entering the mouth of the net (in particular cod, megrim and monkfish) with reference to explaining their horizontal distribution.

Protocols

Equipment will be loaded at Fraserburgh on 24 July 2011. Additional preparation of the fishing gear and RCTV system will continue on 25 and 26 July, as required.

Staff will travel to Fraserburgh on the morning of 27 July. The vessel will then travel to Scalloway harbour to collect visiting staff (P MacDonald, NAFC). Trawling will be conducted in waters around Shetland (Charts 1-3). Alba na Mara will sail to harbour for the evening of 2 August to exchange scientific staff (B O'Neill for A Edridge). On 8 August, P MacDonald will be dropped off at Scalloway or Lerwick harbour before sailing back to Fraserburgh where the cruise will end on 10 August 2011.

Trawl Observations

The first part of the cruise (estimated to be ~1-2 days), will focus on monitoring the "3T trawl". This will involve the RCTC and scanmar systems quantifying the dimensions of the entrances to the three compartments. The Auto-Trawl system will also be monitored in association with a scanmar symmetry unit mounted on the headline of the trawl, to verify the trawl is fishing correctly. Behavioural data (catch and video) will still be collected during this part of the cruise.

Behavioural Observations

Once the gear development is complete, the remainder of the cruise will be used to investigate the behaviour of fish immediately ahead of the trawl. Behavioural data, in terms of horizontal distribution of fish as they enter
Chief scientistKeith Summerbell (Marine Scotland Aberdeen Marine Laboratory)
ProjectSU004
Ocean/sea areas 
GeneralNorth Sea
North East Atlantic Ocean (limit 40W)
SpecificScalloway Deeps (Shetland), St Magnus Bay (Orkney), Unst (Shetland).
Track chartsFRV Alba Na Mara 1011A cruise track — 1011atrk.pdf (00 MB)