|Ship name (ship code)||Thalassa (35HT)|
|Cruise period||2015-10-17 — 2015-12-01|
|Port of departure||Brest, France|
|Port of return||Brest, France|
|Objectives||French Bottom Trawl Surveys in Bay of Biscay and Celtic Sea.
- obtain abundance indices per age group and annual recruitment estimates for the sampled species
- build a reliable time series of those indices
- follow the evolution of the demographic structures of the main exploited fish populations
- map the spatio-temporal distribution of the fisheries resources per age group
The GOV 36/47 bottom trawl is used with a 20 mm mesh codend liner. The trawl is deployed with plane oval trawl boards of 1300 kg and with 10-20 cm rubber discs on the footrope. The haul duration is 30 minutes and the towing speed 4 knots. Trawling is carried out during day time only. In the Bay of Biscay (ICES division VIII) and in the Celtic Sea (ICES division VII), a stratified sampling scheme is used. The area is divided according to latitude into 5 blocks and the hauls were distributed in seven depth zones (15-30, 31-80, 81-120, 121-160, 161-200, 201-400, 401-600 m). 160 stations will be occupied. Catch weight and catch numbers are recorded for all species, only selected finfish and shellfish are measured.
|Chief scientist||Michele Salaun (IFREMER, Lorient Station)|
Bay of Biscay
|Specific||ICES areas VII e-j; VIII a-d|