l89>- N*0. 9. HYDR.-BIOL. STUDIES OF THE XORW. FISHERIES. 



Chapter II. 

 Personal Hjdrographical Investigations. 



The investigations, of w hich I shall now render an account, have, as 

 mentioned in the preface, been made during the period from November 

 1893, to the Spring of 1895. During that time it has been my object, 

 in respect to all main features, to obtain tlie first general view of the^ 

 extent to luhich the hydrographical conditions off the West Coast of Nor- 

 ivay undergo changes, and to zvhat periodical, or non-periodical latus 

 these changes are subjected. 



The work has, especially, been confined to one fixed portion of the 

 coast, namely the West Coast Spring Herring District, as I maintained 

 that numerous investigations, carried out at the same spot, would best 

 give an idea of the periodical changes during the various seasons of 

 the \ear. Along with this I have, occasionally, endeavoured to extend 

 the investigations to other parts, and one will thus find numerous ob- 

 servations, both from the mouth of the Christiania Fjord, as well as 

 from the North, from the banks near Vigten and the Lofotens. These 

 investigations, however, are a secondar\^ matter, as almost all of them 

 are confined to one season, and are therefore of a more disconnected 

 character. 



From my Charts and Tables it will also be seen that, to a great 

 extent, I had to confine myself to local investigations in tlie vicinity of 

 the land. The reason for this was not due to my not perceiving the 

 value of extending the observations further seawards, but that, only on 

 a few occasions, as in November 1893, and February 1894, had I the 

 means of obtaining the serxices of a steamer on the West Coast. It 

 must be remembered how difficult and expensive all investigations must 

 be in the storm}- seasons on our weather-beaten West Coast. 



Vid.-Selsk. Skrilter. M.-X. Kl. No. 9. 1895. 2 



