114 PISCES (the fish) 



(c) Does this fish feed in the daytime or in the evening 

 and at night? 



(3) Concealment. 



(a) Where does this fish hide? 



(b) For what purpose or purposes does it hide? 



(c) Has it an}^ natural means of concealment? If so, what? 



(4) Senses. 



(a) What evidences have you as to whether or not fishes 



can hear? 



(b) Evidences that they can smell? 



(c) Evidences that they see? 

 2. Laboratory Study. 



(1) Locomotion. 



(a) Just how is locomotion accomplished by this fish? 



What fin or fins are most used in locomotion? 



(b) Experiment and find out the use of the paired fins. 



(1) Keeping the fish under the water, pass a rubber 



band over the pectoral fins so as to hold them 

 close against the body.^ What effect does this 

 '*' have upon the position of the body? 



(2) Same as (1) for the ventral fins. 



(2) Respiration. 



(a) Watch the movements of the mouth and gill covers. 



(b) Experiment and find out whether the water moves 



over the gills and out through the mouth, or in 

 at the mouth and out over the gills. 



(3) Feeding. Try several kinds of food. 



(a) Does it have any choice? If so, by what sense does 



it choose its food? 



(b) Feed it at various times in the day or night. Results? 



(c) How does it take its food? 



(4) Senses. 



(a) Experiment and find out whether it sees or hears 



you first. Which of these senses is of the greatest 

 value in warning it of danger? 



(b) What is its range of sight? 



(c) Does it ever close its eyes or wink? Why? 



(d) Has it any voice or song? Why? 



^Colton's "Practical Zoology." 



