CRUISE REPORT INTERPELACUS 0414
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Bay of Biscay
An intercalibration survey aiming at to verify if the PELACUS survey time series could have been affected by the change from R/V Thalassa to R/V Miguel Oliver has been carried out off the Garonne mouth. To do that, the inter-ship variability in some sampler devices (mainly acoustics, CUFES and fishing gears) have been compared with the intra-ship variability in order to give coherence to the time series (i.e. small vessel effect). Accordingly, the null hypothesis the characterisation of the pelagic ecosystem by means of an acoustic-trawl survey would give significant differences on account the vessel effects was tested. Acoustic sampling consisted in two tracks 2.5 espaced and divided in two areas, shallower, with 22 nmi from 40 to 60 m, and deeper , with 10 nmi, from 110 m to the slope. These four track were surveyed three times for each vessel, first in parallel and the others with one of the vessels leading. In the same way 15 parallel fishing station were also perfomed. However, ...
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