64 



the boundary to the true Baltic). They tlius foiind none in tlie true Baltic either 

 in Febrnary or May. 



In 1904 we took the pelagic Lumpenus young from March to May. They 

 were exceedingly abnndant in Maich in the southern waters. Most were taken in 

 the western Baltic but many also in tlie true Baltic and Great Belt. In March we 

 took 9 specimeus in the Kattegat, all in the northern part at Læsø Rende. 



In April (13th) we took one specimen in an intermediate haul (see Tab. 1) 

 and in May a large number in the western Baltic, some even as late on May 30th. 



It was only in the western Baltic tliat we found the Lumpenus young in 

 May, and just as in May 1903 the greatest (pantity was taken in bottom-hauls 

 with the young-fish trawl. In 1904 this apparatus however was provided with 

 blocks, so that it worked somewhat above the bottom. It was therefoi'e possible 

 to distinguish betweeu the young, which lived ou the bottom and those which 

 lived intermediately near the bottom. The bottom-hauls with the youug-fish trawl 

 (without blocks) are seldom noted in Tab. 1 and not for the May stations in the 

 western Baltic. Thus all the Lumpenus young noted in Tab. 1, western Baltic, 

 for May were really pelagic, but the great majority were living near the bottom. 

 It thus appears that the pelagic young of Lumpenus in the transition to the bottom- 

 stage approach the bottom and live pelagically there for some time. Some journal 

 extracts from the investigations in the western Baltic in March — June will hest 

 illustrate this condition: 



D. 23 — 3 — 04. Skjoldnæs in N. E., 19 fm. Yonng-fi.sh trawl on surface, lOminutes: \ Lum- 

 penus young and 163 young of other species. Youngflsli trawl — 10 fm., 10 minutes: 82 Lum- 

 penus young, 72 young of other species. Young-flsh trawl on blocks on bottom, 10 minutes: S Lum- 

 penus youny and 4 young of other species. Young-fish trawl on bottom, 10 minutes: no }onng, 



5 older Lumpenus. 



Most if not all the Lumpenus young were on that day living at the highest 

 10 fathoms below the surface. 



D. 6—5—04. W. from Skjoldnæs, 18 fm. Young-flsh trawl — ca. fm., 10 minutes: no 

 young of Lumpenus, 41 young of other species. Young-fish trawl — ca. 16 fm., 20 minutes: 10 

 Limipenus young, 38 young of other species. Young-fish trawl on blocks on bottom, 10 minutes: 

 ca. 20 Lumpenus young, ca. 26 young of other species. Young-flsh trawl on bottom, 10 minutes : 

 ca. ,S0 Lumpenus of all stages, also of O group, no other fish young, a few other fish. 



Most of the Lumpenus young taken on this day were 18 mm. long. All the others were 

 larger and gave the impression of lieing near the end of their pelagic Ufe. 



We see from this that the Lumpenus young were nearing the bottom in 

 the beginning of May. Even at the end of May they had not all goae over to 

 the bottom-stage : 



D. 30—5—04. W. of Skjoldnæs, 18 fm. Young-fish trawl — ca 15 fm., 30 minutes: 

 1 Lumpenus young, ca. 35 mm., 94 young of other species. Young-flsh trawl on blocks on bottom, 

 20 minutes; 7 Lumpenus young 30 — 40 mm., 65 yonng of other species. 



Though we thus still found a few Lumpenus young in intermediate waters 

 on May 30lh, the great mass of the Lnmpenus young in the western Baltic must 

 by that time have changed over to the bottom-stage. On June 13th, wheu we 

 were again fishing at Ærø, the pelagic life had been given up: 



D. 13—6—04. W. of Skjoldnæs, 18 fm. Young-fish trawl — ca. 16 fm., soveral hauls: 

 no young of Lumpenus, many young of other species. Young-fisli trawl on liottora, 10 minutes: 



6 Lumpenus of O group with brown alidominal pigment. 



