The specific weight of summer herring in September 1949 reached 40% in the north-eastern 

 region of Iceland, 35% in the same region in 1950 and, to the south of the island, from 40 to 70% 

 in 1951. 



Concentrations of post-spawning summer herring to the north-west of the island in 1951 

 were distributed over a large area of water. Average catches were of an entirely adequate com- 

 mercial character. Concentrations of the summer race in the second half of August to the south- 

 east of Cape Reykjanes also covered a great area. Average catches throughout the fleet in this 

 region were high. In September, the vessels continued to catch in the south summer herring which 

 were fattening. 



In the northern Iceland regions, the summer herring has its highest commercial significance 

 at the end of the fishing season-- the second half of August and September --and also at the begin- 

 ning of the season-- in June . 



The western region of the island was not explored in detail until 1951 and then the summer 

 race vras found in late July and early August . To the south of Iceland, summer herring was found 

 in the second half of August and in September. Distribution of adults of the summer herring is 

 shown in Figure 11. 



/ — 



2 — L 



3 — 



4 — O 



5 — 



$ Ml 



Faroes _J? ,,,.;; 



«• 



65' 



Figure 11. Distribution of adult summer herring by months: 1. May 2. June 3. July 



4. August 5. September; 6. Shading shows zones of commercial concentra- 

 tions. Black: pre -spawning herring. Blank: f)ost-spawning herring. 



On the basis of the results of the researches, we can give a preliminary plan of the migra- 

 tions of the summer herring, a plan which after future researches will undoubtedly be made more 

 exact . 



196 



