The fisherman and his soul

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Across
  1. 1. Fishermen use these to catch fish
  2. 4. A large white sea bird.
  3. 5. Moving water on the surface of the sea.
  4. 6. A mythical creature. It has the top of a woman and the bottom of a fish.
Down
  1. 2. A sea mammal. It can come out of water on the land.
  2. 3. The name for the sand near the sea.
  3. 4. The empty covering of soft sea animals.
  4. 7. A mythical creature. It has the top of a man and the bottom of a fish.