43 



in the deeper haul. A 10 miniites haiil with the young-fish trawl on the surface gave no 

 plaice young. 



D. 29 — 4 — 04. Aalljæk Bay. Plaice young wore sought for at Aalbæk from the shore 

 outwards in deeper water down to 12 fm. We used the net on sandy bottom along the coast 

 were we conld wade but withont result, and similarly with the "half-moon" net from the boat 

 down to a depth of ca. 1'/.. fm. In 2 — 3 fm., sandy bottom, a 10 minutes haul on the bottom 

 with the young fiBh trawl gave o plaice young; another haul in 3—4 fm., sandy bottom, likewise 

 gave 3 specimens. These 6 specimens were 9 — 12 mm. long, more or less asymmetricai; only 

 one of them was more pigmented on the right side than on the left, and even in this the meta- 

 morphosis of the eye was not }et complete, the left eye being on the ridge and still looking to 

 the left. The plaice young taken gave one therefore the impression of being pelagic, and in order 

 to obtain information as to how far the plaice young were living on the bottom or higher up, 

 we made some hauls at the same spots, i. e. 2 — 3 and 4 — 5 fm., with the young-tish trawl on 

 blocks, thus near to but above the ground. No plaice young were taken in these hauls, and all 

 goes to show that the plaice young in 2 — 4 fm. cif Aalbæk were living on or very near to 

 the bottom. 



D. 29—4—04. Aalbæk in N. AV., 3 miles, 6 fm. (Tab. 1, Kattegat). In a 10 minutes haul 

 with the young-fish trawl on blocks on the bottom we took 11 plaice young, 8 — 12 mm., some of 

 which were symmetrieal, otliers asymmetricai but only a little. Here therefore we took the plaice 

 young a little above the bottom. 



I). 29 — 4 — 04. E. of Hirsholm, 12 fm. (Tab. 1, Kattegat). Here we took the plaice young 

 in a 10 minutes haul with the young-fish trawl on blocks on the bottom, but this time only two 

 specimens, 10 mm. long, both symmetricai. The young-fish trawl on the surface, 10 minutes, and 

 the same net at a depth of 6 fm., 10 minutes, gave no jilaice young. 



The investigations of the 21st — 29th April iu the North Sea, northern 

 Kattegat and at au adjacent station in the Skager Rak gave thus the following result: 



North Sea. 

 D. 21—4 — 04. Thyboron Channel; c. 1 foot: 1 metamorphosed plaice young on bottom. 



Kattegat 

 D. 27 — 4—04. N. of Frederikshavn's harbour; 1 foot: 1 metamorphosed plaice young on bottom. 

 D. 29—4—04. Aalbæk Bay; 0—1'/, fm.: no plaice young. 



— — 2 — 4 - some asymmetricai, but not metamorphosed 



plaice young on or near bottom. 



— — 6 - some asymmetricai and some symmetricai 



plaice young a litte over the bottom. 



— — 12 • some symmetricai plaice young a little over 



the bottom. 

 Skager Rak. 

 D. 28—4 — 04. Skaw light-ship in S.; 35 fm.: many symmetricai and asymmetricai ^jtecc 



young ca. 12 fm. under surface. 



Some of these plaice young were thus still symmetricai, but most were more or 

 less symmetricai, those taken at Thyborøn and N. of Frederikshavn were meta- 

 morphosed specimens. 



On the North Sen and Skager Rak coasts the transition to the hottom-stage 

 had thus hegitn at the end of April. Some of the young living at the hottom were 

 not completely metamorphosed. 



A short time after the investigations mentioned were concluded, the »Sal- 

 lingsund« came to the western Baltic, where we took up our station to the west of 

 Skjoldnæs on May 6th, 18 fathoms (Tab. 1, western Baltie) and on the same day 

 investigated the sand banks at Ærø i Søby Bay. The picture of this day's investi- 

 gations of the plaice young is quite different from the above, as will be seen from 

 my notes in the journal. 



