The oxygen shortfall in the Baltic Sea must not exceed the values of the oxygen bond index, which is 8,66 in the Gulf of Finland, 8,66 in Northern Baltic Sea, 2,02 in the Åland Islands, 2,02 in the Bothnian Sea and 0,81 in the Bothnian Sea. Plankton shall, by means of plant and zooplankton, determine the status of the plankton in the weakest position. In the absence of these, indicators of the habitat, such as visual acuity and oxygen conditions, may also be used.

The threshold values for the chlorophyll content of phytoplankton on the high seas in HELCOM are to be reduced: In the Gulf of Finland, 2,00 µg L-1, 1,65 µg L-1 in northern Baltic Sea, 1,5 µg L-1 in the Åland Islands, 1,5 µg L-1 in Bothnian Sea, 2,00 µg L-1 in the Kvarken Sea and 2,00 µg L-1 in the Bothnian Sea. Plankton shall, by means of plant and zooplankton, determine the status of the plankton in the weakest position. In the absence of these, indicators of the habitat, such as visual acuity and oxygen conditions, may also be used.

There are species in the phytoplankton community that represent a healthy food web and species that indicate eutrophication are not predominant, as assessed by the phytoplankton community indicator. The status of the plankton community is determined by the phytoplankton and the zooplankton. In their absence, habitat indicators such as visual depth and oxygen conditions may also be used.

The average size and total biomass of the zooplankton community is both indicative and high in the feed. The thresholds for the average size and total biomass are 8,6/125 in the Gulf of Finland, 5,1/220 in Northern Baltic Sea, 10,3/55 in the Åland Islands, 8,4/23,7 for the Bothnian Sea and 23,7/161 for the Bothnian Sea. Plankton shall, by means of plant and zooplankton, determine the status of the plankton in the weakest position. In the absence of these, indicators of the habitat, such as visual acuity and oxygen conditions, may also be used.

The concentrations of dissolved oxygen in water bodies in coastal waters do not fall below 4 mg L-1 (monthly mean). Plankton shall, by means of plant and zooplankton, determine the status of the plankton in the weakest position. In the absence of these, indicators of the habitat, such as visual acuity and oxygen conditions, may also be used.

The visual depth thresholds established for water management are exceeded in: Inland Gulf of Finland 3.5 m, Gulf of Finland 4.4 m, Southwestern Inner Archipelago 3.6 m, Southwestern Outer Archipelago 4.6 m, Inner Sea m, in the outer coastal waters of the Bothnian Sea, 4.1 m, in the Inner Kvarken Archipelago, 2.3 m, in the outer Kvarken Archipelago, 3.7 m, in the outer coastal waters of the Gulf of Bothnia, 3.3 m.

The threshold values for chlorophyll levels in water management are underestimated: In the internal coastal waters of the Gulf of Finland, 3,5 µg L-1, 2,5 µg L-1 in the outer archipelago of the Gulf of Finland, 3,0 µg L-1 in the south-west archipelago, 2,5 µg L-1 in the south-west archipelago, 2,3 µg L-1 in inner coastal waters in the Bothnian Sea, 2,7 µg L-1 in the outer archipelago area of Bothnian Sea 2,1 µg L-1, 3,3 µg L-1 in the outer archipelago and 2,2 µg L-1 in coastal waters in the Bothnian archipelago, 3,3 µg L-1 in the outer archipelago and 2,2 µg L-1 in the outer coastal waters of the Bothnian Bay. Plankton shall, by means of plant and zooplankton, determine the status of the plankton in the weakest position. In the absence of these, indicators of the habitat, such as visual acuity and oxygen conditions, may also be used.

The high seas value thresholds laid down in HELCOM are exceeded:In the Gulf of Finland, 5.5 m, North Baltic Sea, 7.1 m for the Åland Sea, 6.9 m for the Åland Sea, 6.8 m for the Bothnian Sea, 6.0 m for the Kvarken Sea and 5.8 m at the Bothnian Sea. Plankton shall, by means of plant and zooplankton, determine the status of the plankton in the weakest position. In the absence of these, indicators of the habitat, such as visual acuity and oxygen conditions, may also be used.

Cyanobacterial blooms and biomass below HELCOM agreed index thresholds: 0.90 in the Gulf of Finland; 0.77 in the Northern Baltic; and 0.58 in the Bothnian Sea. The status of the plankton community is determined by the phytoplankton and the zooplankton. In their absence, habitat indicators such as visual depth and oxygen conditions may also be used.