current varies, as a rule it goes down to a depth of between 5 and 10 metres. The 

 lower waterlayers as a rule run in with less speed. 



This current system is probably to a large extent due to suction from the Baltic 

 current and also to the outflow of fluvial water from the fjord itself. Variations in 

 these factors naturally excercise their influence. 



Tow-nettings and current measurements, simultaneously made, have shown that 

 cod eggs and larvae live as well in the outgoing as in the ingoing current. 



As an example of an observation of this kind the following may be quoted. 



S0ndeled-Fjord st. in 



10. V. 1904 



Changes may occur in the above-sketched current system. A westerly gale lasting 

 some days will thus blow nearly all the surface water away from these fjords, and 

 bring the salt bottom water, from 20—30 metres depth, right to the surface. After 

 such a gale the salt bottom water will again drop down and pull over it a strong, deep 

 ingoing waterlayer from the Skagerrack. Rises and falls in the deep salt layers of the 

 Skagerrack will produce the same efi'ect. 



A diagram (Fig. 8) showing the alterations in the water-layers contemporaneous 

 to the tow-nettings, which were undertaken on 4 occasions in the spring 1905 (see 

 chart page 18), will clearly illustrate the changes which took place in the S0ndeled Fjord 

 as well as also in the neighbouring fjord, the Sandnes Fjord. The water-layer in 

 which the larvae mainly live (the white layer between 20 and 30 pr. thousand 

 salinity, and where the isopykn of 1-021 is drawn), is subjected to great changes. 



rises, sweeps all the water above 20 m. depth out of 

 drops and sucks in new waters of low salinity from the 



The salt bottom water 

 the fjord, then again 

 Skagerrack. 



Exactly the same 

 observations were made 



changes occur in the Skagerrack, where contemporaneous 



„ — ^ two miles from the coast. On April 1st the isopykn of 1-021 



was at a depth of 18 m. ; on April 14th, at 8 m.; on May 3rd at the surface and on 

 May 23rd at 8 m. again. 



Along with these great changes of the surface layers in the fjords great changes 

 were also observed in the number of cod larvae, mentioned above, and also in the 

 number of other fish larvae. The diagram Fig. 9 shows the relation between the rise 

 and fall of salinity, the isopykn of 1-021 and the average number of cod larvae per 

 haul in the S0ndeled Fjord on the four occasions mentioned on page 18. (See Fig. 9.) 



