170' 



Figure 3. Surface Temperature and Phosphate. This 

 oceanographic production line does not run steadilyo In this picture 

 we see evidence of a spurt at the beginning of the chain of events. 

 The lines follow equal temperatures and the shading indicates the 

 variation in nutrients (phosphate). The tongue of cold water can be 

 seen along with the dark shading indicating masses of high nutrient 

 waters. Such masses of enriched water are of primary interest 

 since the genesis of the abundamce of tuna must be related to them„ 

 Strong winds have given a push to the circulation system and we 

 think that this will soon be followed by an extra good concentration 

 of tuna. We have no ideal.ow many days or how nnany miles sepa- 

 rate the push of the wind from the bunching of the tuna, but figure 8 

 proves such bunching of the tuna does occur. 



