42 



here. This belt is particularly characterized by tlie great number o£ various 



flat-fishes, particulavly their higher ages, from which reason also the cutters 



from Frederikshavn aud the Siiaw carry oii their plaiceseiue fishery chieflj' 



at this place. 



Of the above-mentioned flat-fishes we find here: 



The Plaice, the two years old as well as the mature three and four years old 

 fisli; the number of the latter has decreased so much of late years that 

 it is quite a rarity to catch it. 



The common Dab [Fleuronedes limanda). All ages. As above mentioned, the 

 tender and the one year old ivy (in contradistinction to tliat of the other 

 flat-fishes of which we have spoken) lives ou deej) water. The 0-group, 

 however, is but rarely caught*). 



The Brill, the Tur hot and the Sole, but of these species the older age- 

 groups only. 

 Of forms which were not found in the belts described above, we may 



f urther meution: 



The Halibut [Hippoglossiis vulgaris), whicli has becn caught onty a few times 

 in 1897 and not at all in 1898, and only where plaice-seines have been 

 employed (cmp. for iustance journal numbers 40 & 41, 3. & 5. July 1897, 

 at Knallens Vager, on 9 and 14 fathoms). It seems therefore that the 

 otter-seine is not so well adapted for the fishing of this species (whicli 

 is the case also with several other species of flat-fishes, e. g. the plaice 

 and the turbot). 



The Norwegian Topknot [Zeugopterus norvegicus), which was not caught 

 either in 1898, but was takeu, for instance, 15. Oct. 1897 with otter-seine. 

 Journal-number C2a, ou 15 — 20 fathoms. 



The little Sole [Solea Infea), which is not among the commonest species 

 either, but is taken now^ and then. 

 In the deeper parts of this belt the following flat-fishes also occur: 



The long rough Dab [Drepmiopsetta platessoides), in various ages, particularly 

 one and two years old. The smallest specimens which have been caught 

 in the Cattegat, have been a little more than 2 indies long; it is possible 

 that the 0-group does not occur at all in this sea, which is the case also 

 withothersof our flat-fishes, viz. the following species and the pole dab'"*). 



*) Cmp. Report of the Biological Station 1893. 

 **) According to carller investigations (Ueport of the Danish Biological Station, 1893, 

 p. 39 — 40) the I-group of thi.s species is c. 3 — 4 Inch. long in the spring (April). Specimens 

 2 — 2'/, inches long have been canglit once or twice in tlie Cattegat, e. g. 29. August 1898, 



