— 13 



APPENDIX H: GARSTANG 



Among' other experiments the Danish investigators transplanted 600 plaice from the Horn 

 ßeef South Grounds to tlie Skager Eak (57°12'N. to 57°21'N.; 8°45'E. to 9°17'E.) on 

 March 1, 1904. All tlie specimens had a length of from 19 to 32 cm. at the time of libe- 

 ration. The rate of growth of the transplanted tish corresponds fairly closely with tliat of 

 the lish normally found in tlie waters of the Skager Eak. The average increase of four specimens 

 recovered in July was 4'8 cm. This growth is at least twice as great as the average growth 

 of plaice on the Horn Reef Grounds. 



In April and May the English investigators transplanted about 1,600 small plaice to the 

 Dogger Bank from the English, Dutch and Danisli nursery grounds. During the voyage from 

 tlie Dutch coast, however, heavy weather was experienced, and most of the fish in the trans- 

 plantation tanks were so injured by the movement of the ship that they were all moribund at 

 the time of liberation. The other experiments were successful. On the 13'^ April 441 plaice 

 were transplanted from Bridlington Bay to the Shoal of the Dogger Bank, and on the 2b^^ and 

 26"i May 706 plaice were transplanted from the Horn Eeef Grounds, and of these 362 were 

 liberated on the Tail of the Dogger, and 344 upon the South Shoal. 



The fish liberated on the Tail of the Dogger have grown at a slower rate than those set 

 free on the South Shoal, but the number of recoveries is too small to show the average 

 increase from month to month. Two flsh recaptured in October showed an average growth of 

 8"2 cm., which represents the growth on this ground in four and a half months. The results 

 with regard to the remaining experiments are shown in the accompanying table, in which the 

 average growth is shown from month to month for each experiment. The average growth of 

 plaice upon the Horn Reef Grounds, based upon the Danish marking experiments, is also shown 

 in the same table. 



Table IV, comparing the Rate of Growth of Marked Plaice after transplantation to the Doggerbank, 

 with the Normal Rate of Growth on the Horn Reef Grounds 



