Di zon , A.E., T.C. Byles, and E.D. Stevens. 1976. Per- 

 ception of abrupt temperature decrease by re- 

 strained skipjack tuna ( Katsuwonus pelamis ). J. 

 Therm. Biol. 1:185-187. 



Decreasing temperature produced responses in 

 fish with threshold values similar to those 

 produced by increasing temperature stimuli in 

 the previous study. Skipjack perceive abrupt 

 temperature decrease (0.5°C per second) as 

 small as 1 to 2 C. 



KEY WORDS: tuna, skipjack, temperature, be- 

 havior . 



Dizon, A.E., W.H. Neill, and J.J. Magnuson. 1977. Rap- 

 id temperature compensation of volitional swimming 

 speeds and lethal temperatures in tropical tunas 

 (Scombridae) . Environ. Biol. Fishes 2:83-92. 



Gave lower and upper lethal limits of tem- 

 perature for skipjack of 15 and 33 C, re- 

 spectively for 30 to 36 cm fish. Skipjack 

 and kawakawa swimming speeds appeared remark- 

 ably unrelated to water temperatures changing 

 at a rate of 1°C per day, from the lower to 

 upper lethal temperatures both for falling 

 and rising temperatures. At temperature 

 changes of 5 C per hour skipjack swimming 

 speed was constant. Kawakawa speed increased 

 with increasing temperature, and yellowfin 

 swimming speed showed no dependence on tem- 

 perature. These behaviors were discussed 

 with relation to the animals' habitat. 



KEY WORDS: tuna, kawakawa, yellowfin , skip- 

 jack, temperature, behavior. 



Dizon, A.E., E.D. Stevens, W.H. Neill, and J.J. Mag- 

 nuson. 1974. Sensitivity of restrained skipjack 

 tuna ( Katsuwonus pelamis ) to abrupt increases in 

 temperature. Comp. Biochem. Physiol. 49A:291-299. 



Skipjack can perceive temperature increases 

 as small as 1 C. 



KEY WORDS: tuna, skipjack, temperature, be- 

 havior . 



22 



