APPENDIX H: GARSTANG 



10 — 



of marked plaice of 25 cm. and upwards recovered by the fishermen within one year from the 

 date of liberation. Tlie coastal grounds are first treated from east to west and then the more 



Table II, showing the Number and Percentage of marked Plaice of 25 cm. length and upwards 

 recovered by the fishermen within one year of the date of liberation 



central grounds of the North Sea. The highest percentage of recapture is reached in the 

 Skager ßak and on the fisliing grounds west of Jutland, where the percentage reached 56 per 

 cent, and 42 per cent, respectively. Between the English and Dutch coasts tlie percentages 

 shown are 23 per cent, for the winter experiments and 27 per cent, for the spring experiments. 

 In the German Biglit between Heligoland and the Dogger Bank the percentage yielded by the 

 German experiments attains 20 per cent. Off the east coast of England, from the Wash to 

 Plamboro', the percentage recovered was very low, viz., 5 per cent., — a feature which is 

 probably attributable partly to the fact that the inshore grounds within the territorial limit 

 are closed against trawling^, and also to the fact that a large area of rough untrawlable 

 gi'ound is present in tliis region, which has to be crossed by the fish before they reach the 

 more frequented trawling grounds. It is perhaps significant in this connection that none of 

 the fish belonging to this group of experiments, irrespective of size, were recovered during tlie 

 first six months after liberation, — all having been caught in the second half-year. The 

 German experiments on the Great Fisher Bank show a percentage of four and seven respect- 

 ively. The Dutch experiments on the Dogger Bank show a percentage of 14. 



It seems from these experiments that the intensity of fishing is much greater on the 

 coastal grounds than on the offshore areas, although the experiments need to be repeated for 

 several years before the figures can be regarded as sufficient for reliable conclusions. 



■ These conditions also prevail along the Northumberland coast. Only one out of the 55 recaptures 

 from Experiment Ell to 23 was effected by a trawler, — the rest by means of lines and salmon nets. 



