23 



region, which might be referred to Belt II, \ve are disappointed. Pelagic eggs are 

 found in quantities in the deeper parts of the true Baltic but the corresponding 

 pelagic young are absent. 



The Danish wafers icifhin the Skaw are fherefore most liJce Belt 1, outside 

 the SJcatv most like Belt II." 



My endeavour to use Schmidt's system of belts for Dauisli waters has 

 clearly shown, that the pelagic conditions here are very complicated. And yet I 

 have restrieted myself to the main outliues without regard for the many variations, 

 which are chiefly caused by the periodic and occasional chauges in the hydro- 

 graphic conditions. I shall mention and show evidence of tlie existence of tliese 

 variations in the special part of this Report. 



Special Part. 



1. Species with pelagic eggs. 

 Cod, Gadus callarias. 



Investigations in 1904. 



Table A gives a summary of our catclies of cod eggs and young in 1904. 

 The table is in three parts: the first contaius the eggs, the second the pelagic 

 young and the third the bottom-stages. The catches in each region are given for 

 each month, but only the months in which either eggs or young were taken are 

 uoted. As regards the eggs, it is only noted if they were found (-(-) or sought 

 for but not found (h-), also for the young what number was taken and how many 

 minutes the hauls lasted. For the capture of the pelagic young the young-fish 

 trawl was used in intermediate waters, for the bottom-stages the same apparatus 

 on the bottom. The first and second parts of the Table are direct copies of 

 Tab. 2 and Tab. 3 B (see p. 83, 84). In the third part the number of young captured 

 and the time the young-fish trawl was at the bottom during the investigations are 

 taken from an unprinted table (bottom-stages in the Danish waters in 1904). 



As can be seen from Tab. A we have in 1904 found the cod eggs in 

 March, April and May; in March however only in the northern waters. It is not 

 excluded however that there maj' have been cod eggs also in the southeru waters 

 in March, as but few determinations of eggs were made during our cruise in the 

 western and true Bal tic in March. 



* With regard also to the distribution of tlie bottom-stages we can di.stinguish between 

 the waters within the Sliaw, wliere such young are scarce, and the waters outside the Slcaw, 

 where they are common. I shall not dwell upon tliis matter here, Iiowever, as the catches of 

 the bottom stages by the »Tliorc are to be described elsewhere. 



