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Across 1. The tail fin 4. Identical, paired fins right behind the head of a fish. 10. Fish use these to breathe. 12. Fish that live in dimly lit areas have _________ eyes than other fish. 15. The type of tank that provides better insulation than glass 16. Chromatophores help fish change colors to suit their surroundings. This is called: 17. It is important for some swampland fish to have a swim bladder to help them breathe in poorly __________ waters. 20. A small, fleshy fin found between the dorsal and caudal fins. 23. After food exits the stomach, it travels through the fish's _____. 26. Whisker-like projections that surround the mouth of a fish 29. Fish that have a swim bladder have better hearing, because it acts as an _____. 30. From the _____, food enters the stomach for digestion. 31. The cheapest type of tank is made from this material. 32. Scales develop from here. 34. Pigment that gives fish their color 36. The cavity where a swim bladder can be found. 38. A tank measuring 100" x 150" could hold how many inches of freshwater fish? 39. The vertical fin found along the back of most fish. 40. The type of blood that fish have.

Down 2. A class of jawless fish. 3. Evidence of fish is found in fossils dating back to the ___________ time period. 5. Fins found below, and just behind the pectoral fins. 6. ____-Dwelling fish feed among the reefs 7. A two-chambered organ found in the chest cavity of a fish. 8. Sharks, lung fish and rays have a _____ through which waste material passes. 9. Fish that live in brightly lit areas have ____________eyes than other fish. 11. Thin, bony plates that overlap to provide protection. 13. A thin layer covering the scales 14. Fish cartilaginous skeletons 18. Undigested material leaves the body through the _____. 19. Tanks made of this material must be cleaned very carefully to avoid scratches. 21. Fish with bony skeletons 22. Since fish have backbones, they are referred to as _____________. 24. ____-Dwelling fish feed on floating insects. 25. First fishes were called ___________. 26. ____-Dwelling fish have mouths that are downturned to scoop food off the floor of an aquarium. 27. Blood produces _________ which fill the swim bladder to aid in floating. 28. Pressure cells found in the lateral line 33. The type of ears that fish have. 35. A tank measuring 30" x 60" could hold how many inches of tropical fish? 37. The underside fin found close to the tail. 38. A tank measuring 75" x 360" could hold how many inches of marine fish?