Fishy Business

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Across
  1. 2. Spookfish
  2. 4. Aquatic breathing organ
  3. 5. Source of Caviar
  4. 8. Common radial souvenir
  5. 10. Slimy Eel
  6. 12. First Period of the Paleozoic Era
  7. 13. Water Farming
Down
  1. 1. Misunderstood Arctic dweller
  2. 3. Air breathing, freshwater dweller
  3. 6. Found or Living in Water
  4. 7. Common bivalve mollusc
  5. 9. Dogfish
  6. 11. 8 armed mollusc