-Partial data on release and recovery otAuxu rochei in the 1965 and 1970-72 (iahing 



Hamada et al. 



1965 

 26 Aug. 



15 Sept. 

 22 Sept. 

 25 Sept. 



7 Nov. 

 1970 



5 Sept. 

 13-15 Sept. 



36°02'N. 141°02'E 



34°38'N, 138°58'E 



34°4rN, 139°27'E 



33°29'N, 135°58'E 



33°25'N. 135°49'E 



OffYatabezakI 

 Offlto 



299 19-21 



691 20-23 



28-29 



2.327 21-31 

 207 21 



319 27 



40 25.4 



60 23-28 



lOnmi 



phototactic (Inoue et al. 1970). Experiments on spectral 

 sensitivity and color vision have determined that A. 

 thazard is probably color blind (Tamura et al. 1972). 

 Niwa et al. (1975) also determined that A. thazard, 

 together with skipjack tuna, seem to have only one cone 

 pigment with its maximum wave length at around 497 

 nmi in the classical position for rod sensitivity. They 

 concluded that the position of the sensitivity maximum 

 at such a short wave length undoubtedly is due to adap- 

 tation to oceanic behavioral life, because wave lengths 



which most effectively penetrate clear oceanic water 

 varies between 480 and 500 nmi. 



Nakamura and Magnuson (1965) observed opercular 

 and orbital black spots on live A. thazard and A. rochei 

 that were maintained in captivity in shoreside tanks. 



They concluded that although the function of the oper- 

 cular spots, if any, is not obvious, the orbital spot may 



reduce the amount of light reflected up into the eye from 

 the ventral rim of the orbit. 



40 



