Cruise inventory

Merlin II 2209H

Cruise plan

Cruise Info. 
Ship name (ship code)Merlin II (74N3)
Cruise identifier2209H
Cruise period2009-10-15 — 2009-10-15
Port of departureStromness, United Kingdom
Port of returnStromness, United Kingdom

1. To increase the knowledge of the offshore and inshore crab stocks to the North of Scotland.

2. To tag Brown Crab, of a range of sizes, from inshore waters to the north of Scotland for investigations of their movements. Tagging will involve using both high-visibility double t-bar tags that are retained on moulting and 'cable-tie' type tags which will be attached to the claws of some of the animals.

3. To biologically sample all tagged crabs for carapace width, shell condition, sex and reproductive state (of females) and record date, time, latitude, longitude, and depth of the return location.


The 3 day charter will be split between 2 vessels to maximise the spread of tagged crabs on the target fishing grounds.

Merlin II (K69)
All gear and scientific equipment will be loaded onto the vessel in Stromness on the morning of Thursday 15 October. Weather permitting, the vessel will then depart and make passage to inshore fishing grounds to the north/west of Hoy, where it already has gear deployed. The vessels crew will be responsible for hauling and removing crabs from pots. Marine Scotland scientific staff will deal with the catch, selecting crabs for tagging, conducting the tagging and recording time, date, biological and positional information before release.

The daily work plan for the vessel will be to haul as many creels as possible. It is estimated 50-60 can be tagged per hour; total numbers tagged will depend on numbers of crabs caught on grounds. The vessel shall return each night to port. Marine Scotland staff working hours will not exceed 13 hours in a 24-hour period and appropriate rest breaks will be scheduled.
Chief scientistGareth Jones (Marine Scotland Aberdeen Marine Laboratory)
Cruise programmeMerlin II 2209H cruise programme 2209h.pdf — access key 'C' (0.02 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNorth/West of Orkney