Klawe, W.L., J.J. Pella, and W.S. Leet. 1970. The 

 distribution, abundance and Ecology of larval 

 tunas from the entrance to the Gulf of California. 

 [In Engl, and Span.] Inter-Am. Trop. Tuna Comm. 

 Bull. 14:507-544. 



Paper deals mostly with Auxis . The geographic 

 distribution of larvae catches were strongly 

 influenced by the distribution of oceano- 

 graphic properties. Temperature clearly was 

 a very important variable for Auxis sp., the 

 optimum temperature for the species being 

 around 27 C. Authors noted a marked increase 

 in the proportion of plankton tows containing 

 larval. Thunnus albacares and Euthynnus 

 1 ineatus occurring at stations where surface 

 temperatures exceeded 26 or 27 C. They also 

 listed water masses within which larvae were 

 taken at various months. No relation per se 

 was made with the distribution of larval 

 tunas and water masses. 



KEY WORDS: tunas, Auxis , yellowfin, skip- 

 jack, larvae, spawning, temperature, season, 

 distribution, oceanography, bullet tuna, 

 frigate tuna. 



Knudsen, P.B. 1977. Spawning of yellowfin tuna and 

 the description of subpopulations . [In Engl, and 

 Span.] Inter-Am. Trop. Tuna Comm. Bull. 

 17:119-169. 



Biochemical genetics indicated a number of 

 genetically distinct groups of yellowfin in 

 the eastern Pacific, and two recruitment 

 groups of a mixture of the above enter the 

 eastern tropical Pacific fishery. Coastal 

 fish showed at least two spawning periods per 

 year which vary in time and extent. Offshore 

 fish did not show this variable pattern of 

 spawning. Spawning time differences were not 

 an isolation factor for maintaining the ge- 

 netic differences; but data were insufficient 

 to determine if spatial isolation was occur- 

 ring. Author proposed that the environment 

 in inshore and offshore areas caused the ob- 

 served differences in spawning behavior. 



KEY WORDS: tuna, yellowfin, population, 

 spawning, season, geography, oceanography. 



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