1 895- ^'o. 9. HYDR.-BIOL. STUDIES OF THE XORW. FISHERIES. 



Districts of the West Coast Spring Herring Fisher}^ Therefore, from 

 October 1894, till April 1895, :\Ir. Bie of Espevær, caused investigations 

 to be made of the temperature, and obtained collections of samples of 

 water between the fishing stations Espevær, Ro-vær and the mainland, and 

 occasionally, also in the Norwegian Channel. This work was carried 

 out with great care, and produced very valuable materials. 



During the East Coast Fishery in the Christiania Fjord, the inspect- 

 ing officer, Lieutenant Buvig, did me the kindness to collect similar 

 materials. In December 1894, I, myself, had an opportunity of making 

 a short excursion to Fredriksværn, and from there, in the »Blinka, the 

 vessel in charge of the Fisheries, made a sectional investigation out in 

 the Skagerak. 



In Januar}- 1895, I took part for a while in a fishing experiment, 

 undertaken, by the Xamdalen's Fishing Association 1, on the banks oft"\'ikten. 

 At that time, and during the subsequent fishing trials, hydrographie ma- 

 terial was constantly gathered in. This material from the Northward, was 

 still furtlier increased through Captain Knap having, during the Lofoten 

 Fishery the previous winter, collected numerous samples of water and 

 observations of the temperature. 



In The Hydrographical Tables the above mentioned materials are ac- 

 counted for, and arranged according to the season in which they were 

 obtained. 



Chapter II, gives a general view, and critisism of the hvdrographical 

 results that have been gained, whilst Chapters III, and I\^, are devoted to 

 the special consideration of the biological investigations which were under- 

 taken at the same time. 



Owing to circumstances, I have not had an opportunitv of emplo\-ing 

 the apparatus invented by Professor Pettersson. His water fetcher was 

 only employed during the investigations in Mkten, it having been kindlv 

 placed at my disposal by Mr. Pettersson. On the other hand I have 

 used Ekman's water fetchers (see. The Norwegian Northern Ocean Ex- 

 pedition. C. Wille. Apparatus and their use, in which the apparatus, 

 in a somewhat different form will be found illustrated on p. 16), as well 

 as Negretti & Zambra's reversible thermometers. In obtaining those 

 samples collected by Lieutenant Buvik, I had an opportunity of using a 

 brass flask, so constructed that the cork could easily be withdrawn at 

 slight depths. In testing Ekman's water fetcher, it has been proved, 

 that this apparatus worked satisfactorily at a small depth. Of plankton 

 apparatus I have only employed plainly constructed nets of silk, and. 

 therefore had to confine myself to the collection of plankton samples 

 from the surface. The reversible thermometers I obtained from the 

 Meterological Institution in Christiania, the Director of which. Professor 

 Mohn, with great obligingness, corrected repeatedly by comparing them 

 with the standard thermometers of the Institute. 



1 An Association for the Promotion of the Fisheries, not a Mercantile Company, 



1* 



