9o Injuries received in capture or in transfer to the bait tank were 

 divided into three classifications for study as large wounds immediately 

 fatalj, nonfatal superficial wounds, and subcutaneous wounds causing death 

 after the passage of a considerable period of time,, 



10, It was possible to prove experimentally that the occurrence of the 

 peak of mortality of bait fishes several days after capture was due to 

 internal bleeding from the subcutaneous wounds described above, 



11, By dropping bait fish headfirst from various heights the magnitude 

 of the lethal force was measured, and it was found that this force 

 correspond to dropping a fish of about 22 grams weight from a height of 

 40 cm or more, 



12o When several weeks have passed after the fish have been placed in 

 captivity, the blood spots called "red rust" by the fishermen appear on 

 the surface of their bodies. This ap pears to be bleeding due to 

 pathological damage to the blood vessels, 



13, If, because of failure of the intake of the pump or for any other 

 reason, a great many small air bubbles are produced in the bait tanks, 

 the fish sometimes find respiration difficult or receive injuries 

 indirectly and die, 



14, When captive fish that have been completely without food for a long 

 time are suddenly fed a large amount, it sometimes brings about their 

 death, 



15, There was a marked reaction when 0,1 = 0,3 cc of a 5% solution of 

 the emetic apomorphin hydrochloride was injected beneath the skin of 

 sardines. Consequently it is thought that there may be a vomiting center 

 in sardineso If this is the case, it is possible that sardines vomit 

 freely because of spiritual perturbation immediately after capture. If 

 they begin vomiting, not only will the sardines be somewhat weakened, but 

 the water within the bait tanks will be polluted, 



16 Sardines taken out into the air can stay alive longer than was 

 expected (10 - 40 minutes), 



17 The best plan in order to prevent the death of bait fishes is thought 

 to be to eliminate insofar as possible the external conditions which cause 

 death as described above*, 



Literature Consulted 



1) Takayama, Itaro and nine others % A test of water=circulating devices 

 for live bait tanks| Journ, Imp* Fish, Exp, Sta„, No, 3, p, 181-247, 1933< 



2) Hall, F, Go s The influence of varying oxygen tensions upon the rate 



54 



