A fishy story and Flora and Fauna of ocean

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Across
  1. 3. its scientific name is hippocampus
  2. 6. biggest animal in the ocean and the planet
  3. 7. Requires carbon dioxide to survive
  4. 9. Good nursery habitats for fish
  5. 10. the writer and his friend came for
Down
  1. 1. the writers friend
  2. 2. a man who rents out land. he is mentioned in the story
  3. 4. a pupil who stays away from school
  4. 5. also called as seals
  5. 8. a chiefly freshwater fish of the salmon family