Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the large area of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 31886 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU has been assessed. The large area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the wider area.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the large area of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 31886 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU has been assessed. The large area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the wider area.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the large area of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 31886 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU has been assessed. The large area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the wider area.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the large area of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 31886 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU has been assessed. The large area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the wider area.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the large area of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 31886 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU has been assessed. The large area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the wider area.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the large area of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 31886 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU has been assessed. The large area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the wider area.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the large area of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 31886 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU has been assessed. The large area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the wider area.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

The achievement of good ecological status for descriptor 5 is quantitatively assessed on the basis of 6 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as water column transparency, opportunistic macro-algae and macrophyte communities. In this MRU, relating to the coastal zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 72% (i.e. 3518 km2 ) of the area achieves good status. On the other hand, 20% (982 km2 ) of the area of the MRU does not achieve good status and 8% (373 km2 ) of the area has not been assessed. On reading the results by criterion, it appears that the eutrophication problems in this MRU are manifested in the coastal water bodies by strandings of opportunistic algae of the Ulva genus. Moreover, the results show that the nutrient concentrations (nitrates) lead to the failure to achieve good status for some coastal water bodies located in the Bay of Mont-Saint-Michel, Bay of Saint-Brieuc, Paimpol - Perros-Guirec and the Bay of Morlaix. However, the coastal water bodies where opportunistic algae proliferate are not in poor condition for the nutrient criterion: the link between nutrient inputs (particularly nitrates) and the development of opportunistic algae is therefore not directly visible through the MSFD assessment. Indeed, opportunistic algal blooms do not only depend on the parameters directly taken into account by the MSFD assessment of descriptor 5 - other parameters such as hydrodynamics (residual currents, tidal currents, stratification of the water column, tidal range), salinity, temperature, or the nature of the marine sediment (which more or less favours the remineralisation process of detrital organic matter), can influence the eutrophication process of water bodies. Furthermore, this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). A clear improvement of the assessment methodology can also be noted compared to the Initial Assessment of 2012.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the intermediate zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 6705 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU could also be assessed. The intermediate area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the intermediate zone.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the intermediate zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 6705 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU could also be assessed. The intermediate area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the intermediate zone.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the intermediate zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 6705 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU could also be assessed. The intermediate area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the intermediate zone.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the intermediate zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 6705 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU could also be assessed. The intermediate area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the intermediate zone.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the intermediate zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 6705 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU could also be assessed. The intermediate area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the intermediate zone.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the intermediate zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 6705 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU could also be assessed. The intermediate area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the intermediate zone.

Achievement of good ecological status is quantitatively assessed on the basis of 4 criteria relating to the concentration of nutrients, chlorophyll-a and dissolved oxygen, as well as the transparency of the water column. The criteria relating to opportunistic macro-algae and macrophyte communities are not relevant to be assessed in this MRU. In this MRU, relating to the intermediate zone of the Celtic Seas marine sub-region, the results of the integration of all the criteria show that 100% (i.e. 6705 km2 ) of the area achieves good status. It should be noted that 100% of the area of this MRU could also be assessed. The intermediate area does not therefore appear to be affected by eutrophication phenomena, and this assessment has been the subject of collaboration at both national and European level (adaptation of the methodologies of the joint OSPAR-COMP3 procedure). There has also been a marked improvement in the assessment methodology compared with the 2012 Initial Assessment, with the use of products from satellite images and modelling, as well as proposals for thresholds for the intermediate zone.