Fish

3. / The ability of a fish to remain motionless in a certain column of water is due to _____.
6. / Fish hearts have ______ chambers.
8. / Fish are classified according to the material that makes up its __________.
9. / Fish waste is mostly made of this.
10. / This is the organ where fish smell.
13. / In saltwater fish, excess water is _______________.
14. / These fins are used for turning.
16. / Gills that have high oxygen content are _______ in color.
17. / This fills with air in a fish to keep them at certain locations in the water column.
18. / The organ through which fish can detect electrical fields is called the ampullae of _________.
21. / The shape of this fin indicates how fast a fish can swim.
22. / Fish with __________ bodies ten to be fast swimmers.
25. / Fish secrete this to keep their scales moist and protected.
26. / A system of nerve cells that are found in a line on fish from the mouth to the tip of the tail.
27. / Conductive elements in the water ___________ out the electrical field.

1. / The nerve cells in a fish’s lateral line.
2. / Scales on fish that are modified teeth.
4. / ____________ compressed fish rely on hiding to catch their prey.
5. / This fin acts as a keel to keep the fish stable.
7. / These are a type of sense organ that can be found not only in the mouth, but also on the body and fins.
11. / In freshwater fish, excess water is ______________.
12. / These fins are used for slowing down.
15. / Bony fish have this to allow them to stay still in the water and still breathe.
17. / Fish have an advanced sense of ____________.
19. / The fish circulatory system has only one of these and higher organisms have 2 _______________.
20. / When fish swim, it causes _________ fields to be generated and sharks detect them.
23. / Fish with _________ caudal fins are slow moving.
24. / The organ in fish that exchange oxygen and carbon dioxide.