52 



stages of the dab on October 12th. We found them in 11 fathoms water, that 

 is, in a basiu sm-rounded by tlie 10 fathoms cnrve (see cliart). 



In the Great Belt in spite of a great deal of searching we only once found 

 the bottomstages of the dab. This was on November 3rd at a station to the west 

 of Vresen in the 8 — 12 fatlioms deep basin between the grounds at Vresen on the 

 one side and Funen on the other. We got there 2 bottomstages of the dab in a 

 10 minutes haul with the 3'oung-fish trawl on the bottom. 



We made many hauls at various piaces in the Kattegat and at various 

 depths, as will be seen from the chart. We got a few bottom stages of the dab 

 nearer the coast thau the 10 fathoms hne, but only a few. Most were taken at 

 about 20 fathoms. 



In October 1904 A. C. Johansen found many bottom-stages of the dab in 

 the North Sea in ca. 10 — 20 fathoms, and earlier in the spring he took them in 

 great nnmber in Aalbæk Bay in less than 10 fathoms. 



Thus in 1904 whilst tve found numerous pelagic dab yoimg in the waters 

 ivithin the Shaw, the Ijottom-stages were rare in shalloiver waters than 10 fathoms. 

 The bottom-stages were very few in nnmber in the Belt Sea and in the true Baltic 

 we found none at all. 



Long-rougli dab. Drepanopsetta platessoides. 



EggS of the longrough dab were found during 1904 in March in the 

 Kattegat and true Baltic (see Tab. 2), Our information as to their occurrenee in 

 the Kattegat comes from A. C. Johansen, who took not a few eggs of this species 

 in the northern Kattegat at the end of March on his spring cruise with the "Thor" 

 (see Tab. 1, Kattegat). The discovery in the true Baltic, where adult long- rough 

 dåbs are never found, may well cause some surprise and may therefore be men- 

 tioned in more detail. 



On March 20th we were returning with the "Sallingsund" from the true 

 Baltic making for the south of Gedser, but before leaving this region we took up 

 a station in tiie W. S. W. of Gedser lightship, 4 miles away, 12 fm. (Tab. 1, true 

 Baltic), thus on the boundary of the western Baltic. Here we made several ver- 

 tical hauls from various depths with the pelagic net and found, that in the upper 

 9 fathoms there were no fish eggs; when we sank the net down to a depth of at 

 least 10 fatiioms, however, we got a few. We then made a horizontal haul with 

 the pelagic net on a pole, thus in ca. 1 fathom's distance above the bottom. We 

 took ca. 100 eggs in 10 minutes, most of them plaice but a few longrough dab. 

 The salinity at the surface was 7. s %q, at the bottom 16.7 %. The surface-water 

 originated in the true Baltic, the bottomwater from the westward. This is evident 

 from the following scheme, which is an extract from Tab. 1, true Baltic and 

 western Baltic: 



