Algae growth:

When we fertilizate we “leave” too much nitrogen. Nitrogen is food for the algae and make the algae growth worse. The algae take almost all the oxygen from the water and make it more difficult for animals and plants to live. Many fish species die. To stop this we can for example use the fertiliser as biogas.

Invasive species:

Invasive species is transported by the ship’s ballast water. Some of those species can affect the ecosystem. For example an animal plankton called “cercopagis pengoi” eat animals planktons that are a lot smaller,and therefore it competes with some fishes that also eat plankton. That affect the ecosystem. It´s also a lot of other species that has been transported to the Baltic sea by the ship´s ballast water, which means that the ecosystem is affected a lot.


Another problem in the Baltic sea is overfishing. The cod stock in the Baltic sea has decreased with 94% from 1984 to 1993, and the salmon is hindered from reproducing because it is fished up before it can reach its home streams. To stop this we need to let the fish reproduce and let the spawn grow before we fish them up, and we need to stop the dumping of dead fish.

The sea eagle is threatened:

About 1970 the sea eagle was about to die. But then people didn´t “leave” so much environmental toxins in the Baltic sea, and therefore the sea eagles survived. But now, many sea eagles die because of lead poisoning. They also dies when it’s so much oil in the water, that can kill an eagle really easy if they just touch the oil. There is about 1100 living sea eagles around Sweden.

Hel Peninsula:

Hel Peninsula was formed by the sea currents which were carrying sand, leached from the seabed. It was created gradually, first small islands were fordem which eventually merged and formed the narrow strip of sand called today Hel Scythe, Gooseneck or just Hel Peninsula.
The length of the Hel Peninsula is about 34 km. The width at the base of the peninsula is between 200 to 500 meters, and at the very end of the peninsula, in the region of the town of Hel 2.9 km.
Microclimate on the Hel Peninsula is related to the position and has a specific character, small temperature fluctuations, both diurnal and annual, the greatest number of sunny days and low rainfall and strong winds.
Helium has two beaches. The overlooking one - the Bay of Puck is much smaller, with the warmer water than on the large beach but with plenty of jellyfish. It is worth mentioning that the land is very picturesque: on the one hand you can enjoy the Baltic Sea and on the other waters of the bay. Puck Bay is an important habitat for migratory birds.

Słowiński National Park:

This poster describes Slowinski National Park, which is one of 23 polish national parks and one of two parks by the sea. It also shows pictures of the most popular flora in this region.

The park is protecting:
- Moving dunes unique in Europe
- Coastal lakes, that came into existence as a consequence of closing the split.
The park is protected by

Pictures present:
Wełnianka wąskolistna - common cottongrass
Wawrzynek wilcze łyko- mezereon
Długosz królewski- royal fern
Mikołajek nadmorski- sea holly
Wydmuchrzyca piaskowa- sea lyme grass
Szczotlicha siwa- grey hair-grass
Torfowiec ostrolistny- small red peat moss
Bażyna czarna- black crowberry
Wrzosiec bagienny- cross-leaved heath
Goździk Piaskowy- Dianthus arenarius
Honkenia Piaskowa- sea sandwort

Seal Sanctuary:

This is the poster that shows the history of the Seal Sanctuary in polish peninsula called Hel. 
The Seal Sanctuary was build in 1999, and it's first inhabitant was a seal called Balbin. 
It was necessary to protect seals, because their number was going down very fast. In the past they were killed for their fur. They were also killed because they were stealing fishes. 
The seal sanctuary wasn't build to entertain people or for show. It's task is to protect seals and let people learn something about The Baltic Sea and its inhabitants.  The project "Błękitna Szkoła" (in English: "The Blue School") organizes trips and lectures for students and pupils to improve their knowledge about the sea. It's really helpful and it draws attention of many teenagers. 
The seals are released from the sanctuary to live near the Hel Peninsula and are observed by the scientists. They use high-tech chips that can track them, collect data about what they eat, how they feel or what their relationships are with other seals.