16 



Baltic, except for quite isolated, single specimens*. We have liowever only iuvest- 

 igated the conditious at and iu the neigbourhood of Bornholm. 



If we compare the uumbers taken each raonth of the yoiing from pelagic 

 and tJiose from demersal eggs, as shown by the summaries (Tab. 3), we see that iu 

 spring it is almost exclusively tlie youug from demersal eggs which are found; for 

 example, in 1904 apart from Cliipc(t,-y ouug, over 1500 youug from demersal eggs 

 were taken in February and March, but only 10 young from pelagic eggs. These 

 latter belonged to the cod (Gadtis callarias), rocMing (Onos sp) and plaice (Pleuro- 

 nectes platessa). 



In April, May and June there was a considerable number of pelagic young 

 from species with pelagic eggs. The Skager Rak and the Western Baltic especially 

 show large uumbers (see Tab. 3 B). Iu April and May they belonged to the species: 

 cod, rockling, long-rough dah (Drepanopsetta platessoides) , plaice, fiounder (Pleuro- 

 nedes flesus) and dab (Pletironectes linianda); in the Skager Rak also, the huddoch 

 (Gadus aeglefinns), whiting (Gadus meriangus) and Norway pout (Gadus esmarJciiJ. 

 In June the young found were almost the same as iu April and May; but pelagic 

 youug of whiting were also taken in the Kattegat aud Great Belt aud pelagic 

 young of the Norway pout iu tiie Kattegat. The rhomboids: tu7'bot (Bothus maxi- 

 mus), hrill (Bothus rhomhus) began to appear but only in single specimens. Cod, 

 loug-rough dab, plaice and fiounder end their pelagic life in June, whilst the 

 pelagic young of the dab are more common theu than those of any other species. 



In July we found a larger number of species of pelagic young of pelagic 

 eggs species than in any other month. The new-comers were the scaldfish (Arno- 

 glossus laterna), Norway tophiot and Midler's tophnot (Zeugopterus norvegicus and 

 punctatus), sole (Solea sp.), macJcerel (Scomher scombe)), wrasses (Labrus sp.) and 

 dragonet (Callionymus sp.). The j'ouug were found almost exclusively in the southern 

 Kattegat (see Tab. 1, Kattegat). 



In the following two months, August aud September, there are extremely 

 few pelagic young of species having pelagic eggs. These beloug almost exclusively 

 to the rockling aud dab in the waters within the Skaw. In the North Sea A. C. 

 Johansen fouud isolated specimens of the pelagic J'oung of guri/ards (Trigla sp.) 

 and weever (Trachinus draco) as well as some pelagic young of the rockling aud 

 scaldfish in September. 



In October 1904 A. C. Johansen found 4 pelagic young of the Great 

 Silver Smelt (Argentina silus) in the Skager Rak aud 1 pelagic young of the 

 guruard. These 5 specimens were the only young from pelagic eggs taken in 

 October, though a great deal of fishing was carried on with the young-fish trawl 

 iu this month, especially in the Skager Rak and Kattegat. Iu October therefore 

 almost all the young from pelagic eggs have given up the pelagic habit. 



The young of the sprat (Chipeu sprattus) has not been separated from 

 those of the herring (Chipea harengns). 



* In the deeper parts of the true Baltic nnmerons eggs of cod and plaice have often 

 been found. We have not uji to tha present found pelagic cod young in the true Baltic, and the 

 pelagic young of the plaice occur only exceptionally there and only in tho western part near 

 Møen. Cod and plaice thus do not develop in the true Baltic, which is probably connected with 

 the extremely low temperature ruling in the deeper, egg-carrying water-layers. 



