science

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Across
  1. 3. young fish
  2. 8. cast of eggs
  3. 11. migrate to freshwater
  4. 12. young salmon
  5. 13. structure that secretes gas
  6. 15. type of fish
Down
  1. 1. open of exscoskeleton
  2. 2. oval yellowfish area
  3. 4. consist of cells
  4. 5. male structure in sharks
  5. 6. young salmon
  6. 7. small gland near mammals
  7. 9. opening for vertebrates
  8. 10. pushes oxygen out
  9. 14. group of organisms