This parameter consists of a census of new sightings/observations of non-native species over the 6-year period under consideration. Thus, this is the first signalling of this species at the scale of all French coasts (all marine sub-regions combined). (Bibliographic reference: Gouillieux, B., Lavesque, N., Leclerc, J.C., Le Garrec, V., Viard, F., Bachelet, G., 2015. Three non-indigenous species of Aoroides (Crustacea: Amphipoda: Aoroidae) from the French Atlantic coast. J. Mar. Biol. Ass. U.K 96(8) 1651-1659. doi:10.1017/S0025315415002027)Date of first reporting (corresponding scientific publication): 2015.date of first corresponding observation (date of sampling of each new NIS in the field): 2014.no threshold is currently available to assess whether or not the parameter has been reached.

This parameter consists of a census of new sightings/observations of non-native species over the 6-year period under consideration. Thus, this is the first signalling of this species at the scale of all French coasts (all marine sub-regions combined). (Bibliographic reference: Bishop, J.D.D., Roby, C., Yunnie, A.L.E., Wood, C.A., Levêque, L., Turon, X., Viard, F., 2013. The Southern hemisphere ascidian Asterocarpa humilis is unrecognised but widely established in NW France and Great Britain. Biol. Invasions. 15: 253-260. DOI 10.1007/s10530-012-0286-x)Date of first reporting (corresponding scientific publication): 2013 Date of first corresponding observation (date of sampling of each new NIS in the field): 2005 No threshold is currently available to assess whether the parameter has been reached.

This parameter consists of a census of new sightings/observations of non-native species over the 6-year period under consideration. Thus, this is the first signalling of this species at the scale of all French coasts (all marine sub-regions combined). (Bibliographic reference: Bishop, J., Wood, C.A., Levêque, L., Yunnie, A.L.E., Viard, F., 2015. Repeated rapid assessment surveys reveal contrasting trends in occupancy of marinas by non-indigenous species on opposite sides of the Western English Channel. Mar. Poll. Bull. 95: 699-706)Date of first reporting (corresponding scientific publication): 2015 Date of first corresponding observation (date of sampling of each new NIS in the field): 2004 No threshold is currently available to assess whether the parameter has been reached or not.

This parameter consists of a census of new sightings/observations of non-native species over the 6-year period under consideration. Thus, this is the first signalling of this species at the scale of all the French coasts (all marine subregions taken together). (Bibliographical reference: Le Garrec, V., Grall, V., Chevalier, C., Guyonnet, B., Jourde, J., Lavesque, N., Bonifácio, P., Blake, J.A., 2016. Chaetozone corona (Polychaeta, Cirratulidae) in the Bay of Biscay: a new alien species for the North-est Atlantic waters? J. Mar. Biol. Ass. U.K. 1-3. doi:10.1017/S0025315416000540)Date of first reporting (corresponding scientific publication): 2016.Date of first corresponding observation (date of sampling of each new NIS in the field): 1996.No threshold is currently available to assess whether the parameter has been reached.

This parameter consists of a census of new sightings/observations of non-native species over the 6-year period under consideration. Thus, this species is newly reported in the Celtic Sea marine sub-region, but there is no information on a possible previous record from the French coast. (Bibliographic reference: Hanson, D., Hirano, Y., Valdés, A., 2013a. Population genetics of Haminoea (Haloa) japonica Pilsbry, 1895, a widespread non-indigenous sea slug (Mollusca: Opisthobranchia) in North America and Europe. Biol. Invasions. 15: 395-406. DOI 10.1007/s10530-012-0294-x)Date of first reporting (corresponding scientific publication): 2013 Date of first corresponding observation (date of sampling of each new NIS in the field): <2003 No threshold is currently available to assess whether the parameter has been reached.

This parameter consists of a census of new sightings/observations of non-native species over the 6-year period under consideration. Thus, this species is newly reported in the Celtic Sea marine sub-region, but had previously been reported in the Western Mediterranean marine subregion (Bibliographic reference: Geoffroy, A., Le Gall, L., Destombe, C., 2012. Cryptic introduction of the red algae Polysiphonia morrowii Harvey (Rhodomelaceae, Rhodophyta) in the North Atlantic Ocean highlighted by a DNA barcoding approach. Aquatic Botany. 100: 67-71. doi:10.1016/d.aquabot.2012.03.002)Date of first reporting (corresponding scientific publication): 2012.date of first corresponding observation (date of sampling of each new NIS in the field): Unknown.no threshold is currently available to assess whether or not the parameter has been reached.

This parameter consists of a census of new sightings/observations of non-native species over the 6-year period under consideration. Thus, this species is newly reported in the Celtic Sea marine sub-region, but had previously been reported in the Bay of Biscay marine sub-region (Bibliographic reference: Gully, F., Cochu, M., Delemarre, J.L., 2013. First observation of the gastropod Nassarius corniculum (Olivi, 1792) in Brittany. An aod - the naturalist notebooks of the Marine Observatory. 2: 26-33)Date of first reporting (corresponding scientific publication): 2013 Date of first corresponding observation (date of sampling of each new NIS in the field): 2013 No threshold is currently available to assess whether the parameter has been reached.