8 



in all the fjordfs, correspondiug to tlie f<tate of things iii tlie Great Belt — 

 Sinaalaudshavet — Eastward, where tlie salinity is decreasing just as in the 

 Isefjord. 



The size of the fry of plaice may be very different in the various 

 localities at the same time of the year (Cmp. table II). This is partieularly 

 striking at two piaces situated so near to one anotlier as Fæiiø in the Little 

 Belt and Baaringvig. At the former place the fry is grouped round 15 mm, 

 at the latter round 35, though tlie gatheriugs have been made on the same 

 day. The said example is the most striking, but several otliers show some- 

 thing like it, as may be seen from table II. 



In some localities the seize of the fry has been investigated on the same 

 sj^of, at varians times of the year, in order thus to get an idea of the average 

 size of the growth. I shall liere give two examples. 



Hevringholm (N. of Djursland. — Stations 3 & 37, table II). The 19. 

 ol' June the average size of 124 young plaice was 25 mm (i. e. the largest 

 group were 25 mm). The 8. Septbr. we caught on the same s|iot 335 

 young plaice, the largest group of which were GO mm. The young plaice 

 had then grown, on an average, 35 millimeter, from June 19. — September 8., 

 i. e. in 80 days, or, if we suppose the growth to be uniform in these sum- 

 mer months, -'Yso i^ii^ ^ day, consecjuently a little less than half a milli- 

 meter a day. 



Holclienhavn (Nyborg Fjord). (Stations 10 & 14, table II). Here we 

 find from July 7. — Aug. 21. a growth from 25 mm— 50 mm, or 25 mm in 

 45 daj's, i. e. a little more than half a millimeter a day. 



While all the hitherto mentioned young plaice of tlie 0-group have been 

 taken on the shores, on low water with sandy bottom, we succeeded, in the 

 begiuning of September 1902, to prove beyond doubt the occurrence of 

 specimens of the 0-group on deep water, 10'/> fathoms, in the Baltic Sea, 

 viz. S. of the isle of Møen with Hestehoved N. V-.- W., on hard, sandy bot- 

 tom with Mytilus, where they were caught with Danish ti-awl in a number 

 of IG, together with specimens of the Igroup and older jilaice, as also one 

 young fiounder of 24 mm and one young common dab of 30 mm. In this 

 connection I shall mentiou that I, on the 23. of July 1902, caught a young 

 plaice of scarcely 2 inclies, on Krieyers Flak (9 — 10 fathoms, Møens light- 

 house in W. \'., S., Mytilus bottom)." 



Johs. Schmidt gives liere a good picture of the occurrence of the fry 

 of plaice in 1902 — a year which seems to have been favourable to the 

 growth of this fry — and the picture becomes clearer when we look at the 

 map, i>. 8, where all the uumbers of the station.s at which this fry was 

 found are marked with lignres, while the piaces where the fry was not 

 found in the time from June — Septbr. are marked with a 0. In 1902 we 

 found no Ogroup before June. In 1893 it was found already on the 30. 



