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Momarsat 2022 cruise report: summary of dives and operations, and position of moorings and observation infrastructures and sampling locations

Monthly mesoozooplankton samplings started in 1950s, performed by vertical tows of Hensen net (73 cm mouth diameter, 330 µm mesh size) from 35–0 m. Samples were fixed in 2 % formaldehyde solution buffered with borax. No flowmeter was used. From 1950s-1995 mesozooplankton was sampled on approximately monthly basis and data are available from January 1972 to November 1995 (with gaps in 1975) and include the abundances expressed as no.ind.m-3 at group level of the zooplankton groups such as Copepoda, Cladocera, Appendicularia, Chaetognatha, Tunicata, Ostracoda, Polychaeta, Decapoda larvae, various meroplankton larvae, Pisces ova, Pisces larvae and Hydromedusae/Siphonophora. From 1995 the sampling program with Hensen net was interrupted and investigations continued with Nansen net, 125 µm mesh size.

Epibenthos and demersal fish monitoring at long-term monitoring stations Trawl samples were taken within the disposal site and outside the disposal site (close neigbourhood) (classic controle/impact design). Sampling activities were in February-March and in September/October. A 8 meter shrimp beam trawl (22 mm mesh in the cod end) equipped with a bolder chain was used.The net was towed during 30 or 15 minutes at an average speed of 4 knots.