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