APPENDIX: H GARSTANG — 8 — 



West of the Dogger Bank and off Tersclielling respectively, but the significance of these reco- 

 veries must for the present remain doubtful. In the following winter period, January to March, 

 the fish were all recovered off the east coast of England, north-west of the original point of 

 liberation, the largest fish (33 cm.) reaching the trawling grounds off the mouth of the Tees 

 in January. This north-westward tendency of the plaice off the English coast north of the 

 Wash in winter time is shown by other special experiments shown in the winter chart. 



3. Winter migrations 



In the Kattegat experiments were made by the Swedish investigators in July and September, 

 1903, the fish being captured near Anholt and transported to the Swedish coast near G-oteborg 

 in each case. In the first experiment (no. 2 on the chart) the bulk of the fish seemed to have 

 migrated during the autumn months directly across to the Danish coasts, four fish having been 

 recaptured on Hertha's Elak during the last three months of the year, and two others during 

 the same period near the original place of liberation. From January to May of the following 

 year most of the fish were recovered in the neighbourhood of Laesö, one near Anholt, and 

 three along the Swedish coast south ofVarberg. 



In the second Swedish experiment carried out in September (no 1 on the chart) none of 

 the fish were i-ecovered on the Danish coast during the remainder of the year, but were distri- 

 buted along the Swedish coast south of G-öteborg. In the following spring, January to April, 

 fish continued to be recovered in the same area, bnt a considerable number were also taken 

 on the Danish fishing grounds near Skagen. Possibly the period of migrations of plaice from 

 the Swedish to the Danish coast is determined to a large extent by the hydrographie or weather 

 conditions prevailing from time to time. 



In the North Sea experiments were made by the German investigators on the Great 

 Fisher Bank and the Northern Mud Bank during September and October, 1902 and 1903 (nos. 

 17 to 21 on the chart). The recaptures in the winter months immediately following all show 

 a pronounced southward tendency on the part of the fish in this region at this season of the 

 year. The same feature is shown by the Dutch experiment 18 (no. 23 on the chart) on the 

 Tail of the Dogger Bank. Plaice marked at this spot in July at first showed a northward 

 tendency in their migrations (VII to IX), which was reversed, however, with the onset of 

 winter, when the fish joined in the general southward migration. The German experiment no. 

 4 (22 on the chart) and the English experiment 26 (26 on the chart), which were carried out 

 in October, 1902 and September, 1903 respectively, show, it is true, a resultant eastward 

 movement on the part of the fishes recaptured in the following November. It is, however, 

 exceedingly probable that these fish began their migrations in a northward direction, which was 

 subsequently reversed into a south-eastward movement. 



The German and Dutch experiments on the Horn Eeef Grounds during July and November 

 (3, 4 and 5 on the chart) are chiefly of interest in showing the inshore tendency of the fishes 

 in this region during the spring months. Owing to the absence of recaptures in the winter 

 months, the actual direction of travel cannot be certainly indicated. The experiments in ques- 

 tion, together with the German experiment 13 (12 on the summer chart) render it probable, 

 however, that the great abundance of plaice on the Horn Reef Grounds during the spring 

 months is largely due to return migrations of plaice from the offshore grounds. 



