198 BIOLOGICAL RELATIONS OF AQUATIC FORMS 



esophagus, which leads to an enlargement called the stomach. What is 

 the shape of the stomach ? 



2. Note that the stomach leads to the small intestine. This in turn 

 leads to the large intestine. How does the small intestine compare in 

 length with the stomach ? 



Conclusion. Why should a fish be provided with digestive organs ? 





Questions 



1. Mention ten important food fishes found in the market. 



2. Where and how were these caught? (Ask the fish 

 dealer.) 



3. Mention some of the peculiar breeding habits of the 

 salmon and the shad. 



4. Mention five important food fishes found in fresh water, 

 w and where were they caught ? 



5. What is a game fish ? 



6. Where are some of the most important game fishes 

 caught ? 



\i 7. What is the United States Fish Commission, and what 

 does it do ? 



J 8. What is a fish warden ? 



A 9. What is a closed season ? Why necessary ? 

 ^ 10. What is caviar ? Why is its sale causing the practical 

 extinction of a certain sort of fish ? 



\ 11. Mention as many commercial products as you can, 

 derived from fishes. 



12. What is the food of young fish ? 



13. Why is a fish called a vertebrate ? 



14. Where are your state fish hatcheries located ? 



15. What fishes are propagated in your state ? 

 - 16. Is the whale a fish ? Explain. 



17. What is a balanced aquarium ? 



18. What did Dryden mean by the following statement ? 



"Thus fishes first to shipping did impart, 

 Their tail the rudder, and their head the prow." 



