samples over 200 cc. in volume and over 300 cc. 

 were thought to indicate that the spawning area 

 was not far distant from the area of collection. 



The distribution in depth of captures, 

 judged from the presumed relative depth of the 

 seven hooks on each unit of longline, indicated 

 that the albacorewere concentrated about 50 m. 

 deeper in summer than in winter. This differ- 

 ence corresponds roughly to the seasonal range 

 of vertical movement of the 19° C. and 21° C. 

 isotherms in the area. 



Marr, John C. , and Lucian M. Sprague 



The use of blood group characteristics 

 in studying subpopulations of fishes. 

 /Conference Paper III - 4. J (In press 

 in papers of the International Com - 

 mission for North Atlantic Fisheries 

 Tagging Symposium, Woods Hole, 

 1960.) 



The necessity for studying .population 

 units of fishes, the desirability of using genetic 

 characteristics in such studies, and the nature 

 of blood group systems are briefly reviewed. 



Examples are drawn from the M-N and 

 A-B-O blood groups in man. Examples are given 

 of blood group systems recently found in several 

 bony fishes, including western Atlantic herring, 

 northeastern Pacific sardine, sockeye salmon, 

 albacore tuna, and one elasmobranch, the spiny 

 dogfish. 



Illustrations are given of how data on 

 blood group systems are useful in attacking the 

 kinds of problems encountered by fishery biol- 

 ogists. Such problems include (1) determination 

 of whether one or more than one subpopulation 

 is contributing to a fishery in a particular area, 

 (2) determination of whether fish from two fish- 

 ing areas belong to the same or different sub - 

 populations, and (3) determination of the con- 

 tributions of two known subpopulations to a 

 single fishing area. 



It is suggested that blood group data will 

 also contribute to the solution of broader prob- 

 lems. 



Matsumoto, Walter M. 



Identification of larvae of four species 

 of tuna from the Indo-Pacific region. 

 I. /"Conference Paper VII - 9.7 

 (Published in 1962 by the Carlsberg 

 Foundation as Dana Report No. 55, 

 14 p.) 



Examination of larval thunnids collected 

 from Indo-Pacific waters by the "Dana" during 

 the 1928-30 round-the-world oceanogr aphical 

 expedition resulted in the tentative identification 

 of larvae of four species of thunnids, Para - 

 thunnus sibi (Temminck and Schlegel), Thunnus 

 germo (Lacepede), T. orientalis (Temminck 

 and Schlegel), and Kishinoella tonggol (Bleeker), 

 which have hitherto been unidentified. Neo - 

 thunnus macropterus (Temminck and Schlegel) 

 has been identified and described by numerous 

 authors, soitwas not included in this discussion. 

 To avoid digressions concerning the nomen- 

 clature of the tunas found in different parts of 

 the world, the earliest generic and specific 

 names given to tunas from this region were 

 used. 



Species identification was done by segre- 

 gating the larvae from three localized areas 

 into various "types" on the basis of number and 

 position of chromatophores on the body, partic- 

 ularly the chromatophores along the dorsal edge 

 of the trunk. The number of larval types in each 

 area was then compared with the species com- 

 position of adult tunas caught on longline fishing 

 gear, including a species (K. tonggol ) which is 

 known to be present in the areas, but which is 

 not commonly taken on this gear. 



All specimens examined had 40 myomeres 

 and had no pigmentation over the forebrain. Lar- 

 vae with no pigmentation along the dor sal edge of 

 the trunk, exclusive of the caudal fin, but with one 

 to five chromatophores along the ventral margin 

 were designated as P. sibi . Larvae similar to 

 P. sibi but having one chromatophore along the 

 dorsal margin of the trunk, at the base of either 

 the second dor sal fin or one of the dorsal finlets , 

 were diagnosed as T. germo. Larvae similar to 

 P. sibi but having two or three chromatophores 

 along the dorsal edge of the body, the initial 

 chromatophore being at the base of either the 

 second dorsal fin or one of the dorsal finlets, 

 were identified as T. orientalis. On all these 

 three species, the origin of the second dorsal 

 fin was located on the 16th myomere. Larvae 

 similar to T. orientalis but having the initial 

 dor sal chromatophore anterior to the 15th myo- 

 mere or the origin of the second dorsalfin were 

 designated K. tonggol. 



Mimura, Koya 



Studies on Indo - maguro . /Conference 

 Paper I -3 J 



Indo- maguro , or bluefin tuna, are caught 

 by the Japanese in two places off Australia, the 

 Old and the New Fishing Grounds. These grounds 



