Three indicators describing different criteria were used to assess the state of the marine environment according to the D2 descriptor: 1) New non-native species for the Baltic Sea (criterion D2C1), 2) Species abundance and distribution in space: black grouse (Neogobius melanostomus) (criterion D2C2), 3) Extent of negative changes, biopollution level index - BPL (criterion D2C3). The environmental status of the marine area was good according to the indicator “New non-native species to the Baltic Sea” (criterion D2C1). During 2012-2017 Two new non-native (alien) species entered the Lithuanian Baltic Sea period: the bivalve mollusc Rangia cuneata and the crustacean Dikerogammarus villosus, but they have already been registered in the Baltic Sea in the sea areas of other countries. The state of the marine environment according to the other two indicators (criteria D2C2 and D2C3): “Abundance and distribution of species in space” for black grouse (Neogobius melanostomus) and “Extent of negative changes, biopollution level index - BPL” - did not reach good. From 2011-2012, the population of Neogobius melanostomus established on the Lithuanian Baltic Sea coast entered the expansion phase, N. melanostomus is found in large numbers in many areas. The abundance of neogobic melanostomas increased from 10 CPUE to 234 CPUE, i. more than 2000%. The black scabbardfish became the dominant abundant fish species, and the abundance of the former dominant native species declined sharply. Evaluation according to the D2C3 criterion and its indicator (BPL index) showed that the level of biopollution caused by the invasive species N. melanostomus in districts BAL-LT-AA-01 and BAL-LT-AA-02 increased from the initial evaluation low (BPL = 1) to extreme (BPL = 4). Dikerogammarus villosus is distributed in the Curonian Lagoon and was found in small quantities in the mouth of the Šventoji River, but has not yet been observed in the open Baltic Sea littoral. There are no data on the displacement of native species and related changes in typical communities, as well as no unnoticed changes in habitats where invasive bypass has occurred. Effects on food webs or any other ecosystem effects are not yet known. There is no impact of the invasive species Dikerogammarus villosus on biopollution in areas BAL-LT-AA-01 and BAL-LT-AA-02 (BPL = 0).

Three indicators describing different criteria were used to assess the state of the marine environment according to the D2 descriptor: 1) New non-native species for the Baltic Sea (criterion D2C1), 2) Species abundance and distribution in space: black grouse (Neogobius melanostomus) (criterion D2C2), 3) Extent of negative changes, biopollution level index - BPL (criterion D2C3). The environmental status of the marine area was good according to the indicator “New non-native species to the Baltic Sea” (criterion D2C1). During 2012-2017 Two new non-native (alien) species entered the Lithuanian Baltic Sea period: the bivalve mollusc Rangia cuneata and the crustacean Dikerogammarus villosus, but they have already been registered in the Baltic Sea in the sea areas of other countries. The state of the marine environment according to the other two indicators (criteria D2C2 and D2C3): “Abundance and distribution of species in space” for black grouse (Neogobius melanostomus) and “Extent of negative changes, biopollution level index - BPL” - did not reach good. From 2011-2012, the population of Neogobius melanostomus established on the Lithuanian Baltic Sea coast entered the expansion phase, N. melanostomus is found in large numbers in many areas. The abundance of neogobic melanostomas increased from 10 CPUE to 234 CPUE, i. more than 2000%. The black scabbardfish became the dominant abundant fish species, and the abundance of the former dominant native species declined sharply. Evaluation according to the D2C3 criterion and its indicator (BPL index) showed that the level of biopollution caused by the invasive species N. melanostomus in districts BAL-LT-AA-01 and BAL-LT-AA-02 increased from the initial evaluation low (BPL = 1) to extreme (BPL = 4). Dikerogammarus villosus is distributed in the Curonian Lagoon and was found in small quantities in the mouth of the Šventoji River, but has not yet been observed in the open Baltic Sea littoral. There are no data on the displacement of native species and related changes in typical communities, as well as no unnoticed changes in habitats where invasive bypass has occurred. Effects on food webs or any other ecosystem effects are not yet known. There is no impact of the invasive species Dikerogammarus villosus on biopollution in areas BAL-LT-AA-01 and BAL-LT-AA-02 (BPL = 0).

Three indicators describing different criteria were used to assess the state of the marine environment according to the D2 descriptor: 1) New non-native species for the Baltic Sea (criterion D2C1), 2) Species abundance and distribution in space: black goby (Neogobius melanostomus) (criterion D2C2), 3) Extent of negative changes, biopollution level index - BPL (criterion D2C3). The environmental status of the marine area was good according to the indicator “New non-native species to the Baltic Sea” (criterion D2C1). During 2012-2017 two new non-native (alien) species entered the Lithuanian Baltic Sea waters: the bivalve mollusc Rangia cuneata and the crustacean Dikerogammarus villosus, but they have already been registered in the Baltic Sea in the sea areas of other countries. The state of the marine environment according to the other two indicators (criteria D2C2 and D2C3): “Abundance and distribution of species in space” for black goby (Neogobius melanostomus) and “Extent of negative changes, biopollution level index - BPL” - did not reach good. From 2011-2012, the population of Neogobius melanostomus established on the Lithuanian Baltic Sea coast entered the expansion phase, N. melanostomus is found in large numbers in many areas. The abundance of Neogobius melanostomas increased from 10 CPUE to 234 CPUE, i.e. more than 2000%. The black scabbardfish became the dominant abundant fish species, and the abundance of the former dominant native species declined sharply. Evaluation according to the D2C3 criterion and its indicator (BPL index) showed that the level of biopollution caused by the invasive species N. melanostomus in districts BAL-LT-AA-01 and BAL-LT-AA-02 increased from the initial evaluation low (BPL = 1) to extreme (BPL = 4). Dikerogammarus villosus is distributed in the Curonian Lagoon and was found in small quantities in the mouth of the Šventoji River, but has not yet been observed in the open Baltic Sea littoral. There are no data on the displacement of native species and related changes in typical communities, as well as no unnoticed changes in habitats where invasive bypass has occurred. Effects on food webs or any other ecosystem effects are not yet known. There is no impact of the invasive species Dikerogammarus villosus on biopollution in areas BAL-LT-AA-01 and BAL-LT-AA-02 (BPL = 0). After applying the OOAO rule, the general environmental condition of the Lithuanian sea area in 2012-2017 according to the D2 descriptor is not good.

Three indicators describing different criteria were used to assess the state of the marine environment according to the D2 descriptor: 1) New non-native species for the Baltic Sea (criterion D2C1), 2) Species abundance and distribution in space: black goby (Neogobius melanostomus) (criterion D2C2), 3) Extent of negative changes, biopollution level index - BPL (criterion D2C3). The environmental status of the marine area was good according to the indicator “New non-native species to the Baltic Sea” (criterion D2C1). During 2012-2017 two new non-native (alien) species entered the Lithuanian Baltic Sea waters: the bivalve mollusc Rangia cuneata and the crustacean Dikerogammarus villosus, but they have already been registered in the Baltic Sea in the sea areas of other countries. The state of the marine environment according to the other two indicators (criteria D2C2 and D2C3): “Abundance and distribution of species in space” for black goby (Neogobius melanostomus) and “Extent of negative changes, biopollution level index - BPL” - did not reach good. From 2011-2012, the population of Neogobius melanostomus established on the Lithuanian Baltic Sea coast entered the expansion phase, N. melanostomus is found in large numbers in many areas. The abundance of Neogobius melanostomas increased from 10 CPUE to 234 CPUE, i.e. more than 2000%. The black scabbardfish became the dominant abundant fish species, and the abundance of the former dominant native species declined sharply. Evaluation according to the D2C3 criterion and its indicator (BPL index) showed that the level of biopollution caused by the invasive species N. melanostomus in districts BAL-LT-AA-01 and BAL-LT-AA-02 increased from the initial evaluation low (BPL = 1) to extreme (BPL = 4). Dikerogammarus villosus is distributed in the Curonian Lagoon and was found in small quantities in the mouth of the Šventoji River, but has not yet been observed in the open Baltic Sea littoral. There are no data on the displacement of native species and related changes in typical communities, as well as no unnoticed changes in habitats where invasive bypass has occurred. Effects on food webs or any other ecosystem effects are not yet known. There is no impact of the invasive species Dikerogammarus villosus on biopollution in areas BAL-LT-AA-01 and BAL-LT-AA-02 (BPL = 0). After applying the OOAO rule, the general environmental condition of the Lithuanian sea area in 2012-2017 according to the D2 descriptor is not good.

During 2012-2017 Two new non-native (alien) species entered the Lithuanian Baltic Sea period: the bivalve mollusc Rangia cuneata and the crustacean Dikerogammarus villosus, but they have already been registered in the Baltic Sea in the sea areas of other countries. The target for the indicator "New non-native species for the Baltic Sea" (criterion D2C1) has been achieved.

During 2012-2017 Two new non-native (alien) species entered the Lithuanian Baltic Sea period: the bivalve mollusc Rangia cuneata and the crustacean Dikerogammarus villosus, but they have already been registered in the Baltic Sea in the sea areas of other countries. The target for the indicator "New non-native species for the Baltic Sea" (criterion D2C1) has been achieved.