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2) Blue Whale 



On the basis of blue whale catch statistics and mark- 

 ing studies, the statistical whaling areas were established. 

 Whale marks are generally recovered in the same statistical 

 areas in which they are placed. Recoveries from areas other 

 than where the tags were administered suggests some minimal 

 movement between areas. For example, one blue whale tag 

 administered in area II was recovered in area IV (Chapman, 

 1974b) . 



3) Pigmy Blue Whale 



Fujino's (1962) research with population genetics 

 suggested that there may be separate pigmy blue whale 

 stocks feeding in Antarctic waters during the summer. 

 Ichihara (1974) also presents limited information supporting 

 the idea of separate stocks of pigmy blue whales. 



4) Fin Whale 



Identifying separate breeding stocks of fin whales is 

 difficult because they are commonly more dispersed than 

 humpback whales. However, general movement patterns and 

 stock segregation similar to humpback whales may indeed be 

 occurring (Chapman, 1974b) . There is evidence that fin whales 

 form relatively small subpopulations in certain northern 

 areas (Fujino, 1964; Jonsgard, 1966). Perhaps similar 

 patterns are present in Antarctic fin whales. Gambell (1975a) 

 stated that segregated breeding stocks of southern hemisphere 

 fin whale populations are often thought to exist, and 

 that the six IWC statistical areas seem to approximate these 

 stocks. However, using data from Ivashin (1969) , Gambell 

 (1975a) divided southern fin whales into eight stocks which 

 apparently mix to some extent in the feeding grounds. Whale 

 marking (Brown, 1962c, 1962e, 1972), body lengths of in- 

 dividuals in separate areas (Laws, 1960), iodine values of 

 fin whale oil (Lund, 1950a, 1950b, 1951) , and serological 

 studies (Fujino, 1964) also suggest separate fin whale 

 stocks. 



5) Sei Whale 



Sei whale stocks are poorly known because marking 

 efforts were virtually non-existent prior to the 1960 's 

 when major exploitation of this species began. Knowledge 

 of movements and breeding groups is scant. Even though 

 sei whales do not range as far south as other whales, they 

 do move south of the Antarctic Convergence in certain areas. 



