Water world!

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Across
  1. 3. A lot of water in the world. Many fish live in it
  2. 4. Children do castles in the beach
  3. 6. The top of the sea or pool
  4. 8. Short part of water in a pool or lake
Down
  1. 1. It makes its own light with its lantern
  2. 2. They live in fresh water but swim to the sae to lay eggs
  3. 5. A species of fish that lives in fresh water near the surface
  4. 7. Walks sideways, it's called Sebastian sometimes!