noted in the Table, as the pelagic young were almost always, wlicn the trawl 

 went OU the bottoni, covered by bottom-material. 



All hauls with the yoimg-fish trawl traverse the water-Iayers to the surt'ace 

 on heaving in, so that, to determine in what depth under the surface the young 

 taken lived, a comparison must be made between the catches at the various depths. 



In tabulatiug the catches of the pelagic young fish* in the various hauls 

 with the young-fish trawl the commonest species are placed first in the 17 vertical 

 columns. Species with pelagic eggs are placed bet'ore those with demersal eggs. 

 The column: Clvpea sp.. includes young from pelagic eggs {Cl. sprattus, Sprat) as 

 well as those from demersal eggs [Cl. harengus, Herring) 



The less commou pelagic young are placed in the last column along with 

 the older fishes and the bottomstages. By older fishes is meant all those con- 

 sidered to be at least one year old; they are marked with'-' to distinguish them 

 from the younger fish placed in the same column. The bottomstages given in 

 the Table are distinguished by the addition "bottom-stages". 



Tab. 2 summarises the occurrence of the pelagic eggs in 1904. The Table 

 is deduced from Tab. 1 and indicates the species fouud in each region in each 

 month of the year. 



Tab. 3 A and B summarise in a similar manner the occurrence of the 

 pelagic young in 1903 and 1904. The number of young taken is noted for each 

 single species for every month and for each region. The Table likewise gives 

 information concerniug the period occupied each month in investigating the pelagic 

 young in each of the regions, as it shows the number of hauls made with the 

 young-fish trawl and the total duratiou of these hauls Tab. 3 B is constructed 

 from Tab. 1, and Tab. 3 A from a corresponding (not printed) Table for 1903. 



Tlie international invesligations of the sea began in 1903. So far as Den- 

 mark is concerned, there were placed in the hauds of "Kommissionen for Hav- 

 undersøgelser", and a steamer, the "Thor", was placed at the disposal of the 

 investigations. During the summer this steamer has been engaged at Iceland. 

 During the spring and autumn it has worked in the Kattegat, Skager Rak and 

 North Sea. On these cruises Dr. A. C. Johansen has collected pelagic material, 

 which he has kindly worked out for the present report. The stations of the "Thor" 

 are placed alongside those of the "Sallingsund'' in the Tables. The investigations 

 were carried out on the same principles and with the same apparatus: pelagic 

 tow-net and Petersen's young-fish trawl, as from the "Sallingsund". 



Neighbouring countries have also taken part in the international investiga- 

 tions; and from the German side a report is already to hånd: "Eier und Jugend- 

 formen der Ostseefische, I. Bericht von E. Ehrenbaum und S. Strodtmann, 1904", 

 in which are deseribed the investigations carried out in 1903 on the pelagic eggs 

 and young of fishes in the western and true Baltic. These regions are included in 

 what we have deseribed as the Danish waters, so that a more complete picture of 

 the pelagic life iu Danish waters is obtained if we compare the German results 

 with ours. 



* The terms "young" or 'young tish" used in tbis work refer only to the speciniens 

 of the firet year's or O group. 



