Sampling is carried out using 3-metre (CP3) and 2-metre (CP2) beam trawls fitted with a scraper (Cochard 2002). The sampling protocol provides for 50 hauls distributed in the 4 strata (monitored areas). 34 hauls were carried out with the CP3 outside the bay, and 16 with the CP2 inside the bay and in its immediate vicinity. At each haul, all the species caught are sorted and the individuals are counted and weighed. All fish of commercial interest are measured.

Changes in strategy can affect the data collected. Thus the sampling effort, which was higher in the early years (60 or so tows), was reduced from 1998 onwards (50 tows) and the D stratum was removed. A total of 81 taxa were identified: 46 were fish and 35 were invertebrates.

Within the framework of the SIH cruises, population indicators are presented for the 36 species encountered in at least 5% of the catches per haul and whose density is at least equal to 5 individuals/km2 . These are divided into 26 species of fish, 3 species of cephalopod molluscs and 7 species of crustaceans. Size indicators are presented for a smaller number of fish species of commercial interest.

• Sample plan(s) :

Stratified.

• Precision of data type :

Abundance

• Parameter(s) observed or measured:

Size, age, density/km².

Evolution of species, biodiversity.

• Resolution of parameter(s) :

Density, biological characteristics

• Format(s):

The available data exist in the format: csv