6 



wliere else on tlie sliores of Denmark, and only near Iccland liave I seeii 

 tliem in such uumbers; but also absolutelj^ considered tlie 0-groiip was 

 rare, as the time spent on these iuvestigations has ofteu sliown me. 



Something similar to tliis has been the case also in other years, as may 

 be proved by a reference to the "Report of the Danish Biol. Station, IV, 

 1893", tables VII & VIII (from the the same seas and from the isle of 

 Bornholm), which show that only 3 plaice under 13 ctm. were caught at 

 Bornholm, but a great many over; and at the isle of Møen none at all 

 under 8 ctm. Table X, loc. cit., on the other hånd, shows many flounders 

 as small as V/2 — 2 ctm. at Bornholm. 



These remarkable differences in the occurrence of the fry (the groups 

 O & I), its frequent occurrence in the Cattegat and, partly, in the Belt-Sea, 

 and its rarity in the Baltic Sea proper, have from the beginning seemed to 

 me to be of tlie greatest importance with respect to the renewal of the 

 stock. The scarcity of the fry on all the Banif'Ji shores of the Baltic Sea 

 during the years in which I investigated the matter, also on the shores of 

 the western Baltic Sea, made me suppose that the fry was scarce, also on 

 the corresponding German and S/redish shores from which we had no infor- 

 mation. I had so much the more reason for this supposition, as it was 

 directly supported by the iuvestigations of Apstein in August 1893 (loc. cit. 

 p. 3), who fouud, near Eckernforde, only one young plaice, but lo3 Houuders. 

 Later investigations on the Germau shores have proved, however, that a 

 great number of small young plaice, iu certain years at any rate, are fouud 

 00 the shores from Eckernfcirde to AA'arnemiinde; hul very feiv hare been 

 fonnd east of the Line Gedser — Darserort. On the shores of Bornholm I 

 myself and my co-workers have in certain years taken some specimens; 

 also, but very few ouly, on the shores of Falster and on deeper water S. E. 

 of tlie i,sle of Møen (See p. 4, table I, column III, 1902). The Holsatia 

 fouud oue specimen, 2 ctm. long, ou deep water; but Schiemenz himself 

 writes after his expeditiou in the Baltic: "Auffalleud ist, das der erste Jahr- 

 gang (mit einer Ausnahnie) vollkommeu uud auch der Anfaug des 2. Jahr- 

 gaugs fehlt. Dies stiramt also gut mit Petersens Anschauung libei-ein". 

 1. c. p. 180. 



The Distribution of the Fry along the Shores. 



Iu 1902 Johs. Schmidt, ou board the Biological Station's steamshij) 

 Sallingsund made a very close investigation of the Danish shores for the 

 purpose of studying the distribution and uumerousness of the fry of plaice. 

 His results are giveu below. 



"TAe distribution of the fri) of tlie year (the 0-group)" was investigated, 

 particularly in the mouths of June and July, 1902, ou the shores, on low 



