. Annexe C 
Rapport de l'administrateur de la Commission B 
Report of the Convener of Committee B 
In view of the recent publication of the General Report, which contains a 
preliminary summary of the observations and experiments on the Natural History 
of the Plaice (Plewronectes platessa) communicated by members of the Committee, 
I have only to report to the Bureau that work has continued steadily on similar 
lines, and that a considerable quantity of new material has been forwarded to me 
from the different countries. 
A large part of this material has been worked up in various ways in 
preparation for the definitive report of the Committee. 
I. Marking Experiments 
The following table shows the extent of the marking experiments upon 
Plaice which were carried out during 1904. The number of Plaice marked was 
slightly greater than during 1903, and there has been a distinct increase in the 
number of recaptures. 
Table I, showing the number of Plaice (P. platessa) marked and liberated during 1904 by the 
various countries, and the number of recaptures of which particulars have been received by 
the Convener 
Number Number Date of last 
G tr P t 
A liberated | recaptured FD registry 
| | 
Sweden (Tr.) ..... ag 150 25 March 31st, 1905 
Denmark (Ord.)... 300 157 52 June 18th, 1905 
— (it) eee 1700 | 160 9 — — = 
Germany (Ord.)... 1298 937 18 April 30th, 1905 
Holland (Ord.).... 247 | 32 13 March 30th, 1905 
England (Ord.).... 813 | 219 26 Nov. 17th, 1905 
a= yp MDE EE 1147 | 167 15 — — = 
Scotland (Ord.) ... 213 | 73 34 May 8th, 1905 
Totals... 6316 1188 19 
Ord. = Ordinary experiments 
Tr. = Transplantation experiments 
