— 166 — 



and conversely, the higher the temperature required the less is the species able to repro- 

 duce in the Norwegian Sea (and North Sea). The above summary shovi's also that it is 

 only the species which are least sensitive as regards temperature, namely those of our 

 "northern" group, which spawn both in the North Sea and Norwegian Sea, whilst the more 

 sensitive species of the "southern" group only spawn to a less extent in the North Sea 

 and not at all in the Norwegian Sea^ 



It is very interesting in this connection to consider the three species cod, haddock 

 and whiting, of which at West Iceland the cod was the species which spawned furthest 

 to the north, the haddock not so far and the whiting still less. In the Norwegian Sea 

 off the Norwegian coast the order of the three species is just the same. Whilst 

 the cod (according to friendly information from Dr. Damas) spawns at least as far north as 

 71° N. L., spawning of the haddock does not take place much further north than ca. 66° 

 N. L. and of the whiting (the species which at West Iceland spawns only quite in the 

 southernmost parts) only up to ca. 62° N. L., at least if we only consider spawning on a 

 somewhat large scale. 



1 That there is a drift of the pelagic fry on a large scale, at least for some species, from the Atlantic 

 into the ÎJorwegian Sea and North Sea, is a different matter, which is discussed earlier p. 158—60). 



^ This synopsis of tho species of the Gadus genus is in the main the same as was published in 

 "Gadus" Part II, p. 17—19, 1906, with the additions and changes which increased knowledge has induced 

 and which refer especially to Gadus Esmarki and minutus as also G. pollachius. 



I use this occasion to correct an extremely unfortunate and disturbing printer's error in the Scheme 

 published in "Gadus", Part II, p. 17-19 (Meddelelser fra Kommissionen for Havundersegelser, Serie 

 Fiskeri, Bind II, No. 2, 1906). 



What is found there on p. 18 above on G. minutus and G. Esmarki should really stand on p. 17 

 following immediately after G. merlangus, as the two former like the latter species belong to Main 

 Group II (as stated 1. c, p, 4 above), and not to Main Group III as would appear to be the case from 

 their position on p. 18. 



In the same way, what is written on G. minutus and G. Esmarki p. 19 should stand on p. 18 

 immediately after what is said about G. merlangus. 



