18 



disappear in June. This rule does not hold liowever for tlie clupeoid youug nor 

 altogetber for the sand-eels. Pelagic 3'oung of Clui)ea appear both in spring and 

 in autumn with a break in the summer months. The larvæ of the two last-named, 

 Clupea and Ammodytes, have not been determined as to the species iu our collec- 

 tions. Under Clupea sp. are included the young of Clupea harengns (lierring) and 

 Clupea sprattiis (sprat); and Ammodytes sp. indudes at least two species, Ammodytes 

 lanceolnfus and Ammodytes lancea. On accouut of this, I shall not go very deeply 

 into a description of the occurrence of the Clupea and Ammodytes young, but 

 postpone this until determinations of the species are to band. Tlie other "elongated 

 larvæ" however will be meutioned more particularly iu the descrii^tion of 

 the species. 



The long-spined sea-scorpion (Cottus huhalis), liparids (Liparis sp.) and 

 lumpsuclær (Cydopterus himptis) appear somewhat later than the above-mentioned. 

 Of these the young of Cottus huhalis will be described later with those of Cottus 

 scorpius. The young of Liparis are undeterrained. They are found in the months 

 of February — July and iu all the I)ani|h waters. The material eertainly contains 

 several species, at all events Liparis liparis and Liparis montagui. I shall there- 

 fore postpone the description of our catches of the Liparis young, until these have 

 been determined. * 



The young of the lumpsucker are only exceptionally met with pelagically, 

 as tlie early stages are usually passed amongst the plant-vegetatiou in shallow 

 water. Even wheu we have takeu the young of the lumpsucker in intermediate 

 hauls, we have often been in doubt as to how far they really were pelagic or 

 were fixed by their suckers to the fioating pieces of weed or other objects, along 

 with which they were as a rule takeu. This has sometimes been actually observed 

 but as we have in other cases taken the young lumpsuckers in intermediate hauls 

 without the net containing anything to which the j'oung could hold, they must be 

 able to live the pelagically.'''* In the case of the lumpsucker therefore there is 



* After this Report had been completed, I have succeeded in separating oiir material of 

 Lipari.? young into two forms, one of which can eertainly be referred to Liparis montagui, whUst 

 the other probably belongs to Liparis lipiaris, thoiigh Liparis hnrhatus is not exclnded. 



I have drawn logether the results of my determinations into the foUowing little table: 



It will be seen that the .young of Lijjaris liparis (?) appear earlier than those of Liimris 

 montagui, as we have taken the young of Liparis liparis(?) in the months March — June, of 

 Liparis montagui in May — July. We have not taken the young of Lipjaris montagui in the western 

 or true Baltic. 



** Not only the young but al.so older specimens of the lumpsucker can live pelagically. 

 We have sometimes taken these in intermediate hauls with the young fish trawl, and one time, 

 10 — 8—04, in an experimental haul with a herring trawl in the Great Belt we took a lumpsucker 

 of ca. 20 ctm.; the herring trawl was fishing in intermediate deijtha. 



