_ 23 — APPENDIX F: HENKING 



Catfish (Anarrhichas) shows certain resemblances to the hake, though the same 

 extremes do not occur. 



The plaice (Pleuronectes platessa L.) is taken in greatest quantities in summer 

 over the whole North Sea (Fig. 7 and 8). Whether this arises simply from local causes, 

 or whether regular migrations of considerable extent also occur here, e. g. to or from the 

 English Channel or Kattegat, where the greatest catches are made in the winter months, I 

 cannot yet venture to say. In the Skager Rak, the catch shows a small rise in autumn 

 (Fig. 9 and lo). 



The gurnard (Trigla) is distinctly a summer-species in the southern North Sea, 

 in the Kattegat just as distinctly a winter-species. For the northern North Sea and the 

 Skager Rak such certain distinctions cannot as yet be made. 



If a fish appears as a summer-species in the one region and as a winter-species in 

 the neighbouring, the suspicion arises, that we have to do with a fixed condition, i. e. a 

 migration. More cannot be said at present, particularly as several species are included 

 under gurnards in commerce, though Trigla gurnardus predominates. 



The witch and lemon -sole (Pleuronectes cynoglossus and microcephalus) show 

 an interesting contrast to the plaice; compare Fig. 7—10 with Fig, 11 — 14. They are 

 distinctly summer-species, especially in the Skager Rak (Fig. 13 and 14). It seems to be 

 different tor the northern North Sea, yet nothing can be said for certain as the material 

 is not sufficiently comprehensive. In the southern North Sea they occur more uniformly 

 and only in small quantities (Fig. 11 and 12). 



The dab (Pleuronectes limanda) shows a similar condition to the foregoing, and the 

 curve of the catches is similar both for the North Sea and Skager Rak. 



Sole (Solea), Turbot (Rhombus maximus) and Brill (Rhombus laevis) are similar 

 to one another in occurrence but essentially different from the species mentioned above. 

 In the Skager Rak, their catches show a distinct depression in the summer-months, and 

 they thus seem to be winter-species here. In the southern North Sea their occurrence is 

 more uniform. 



The saithe and pollack (german: "Köhler") must be treated carefully in seeking 

 for wider interpretations, because two species are included here (Gadus virens and 

 G. pollachius), the proportions of which in the total quantities have yet to be ascertained. 



Regarded as one species, it can only be said, that they are taken by our steamers 

 chiefly in the winter-months of both years in the northern North Sea, but on the other 

 hand in the summer-months, with a second increase in November — December, in the 

 Skager Rak. 



We may therefore conclude, that a migration of these fishes takes place between 

 the two regions, and the southern North Sea is but little concerned in this migration. In 

 the most southerly parts of the North Sea, the saithe and pollack are obviously visitors 

 only coming from the north in greater or smaller shoals. 



