Spectacular high densities of small semi circular depressions or pockmarks (more than 100 for 0.01 km²), were observed in the eastern part of the Bay of Concarneau (south Brittany). The diameter of the pock marks can range from less than 1 m to 40 m at most, their depth never exceeding 1.5 m. The seabed outside of the several metre-wide craters, is colonized by a dense suspension-feeding amphipod crustacean (Haploops spp.), forming a carpet of several thousand individuals per m².
The seafloor surface is slightly perforated and is reminiscent of pancake batter after cooking.
48°47.15’N – 3°54.9’W
Seabed characterisation of Haploops habitat
Geaoswath 250 kHz, Geoacoustic
Acoustic data processing software
Axel Ehrhold, IFREMER
Axel Ehrhold and Agnès Baltzer, IFREMER
Céline Cordier, Stanislas Dubois