62 



conditions under which the parks are held stipulate for 

 the maintenance of a passage way one metre wide 

 between adjoining" concessions. 



Crabs are the most active and persistent enemies of 

 the oyster culturist. They are combated in two ways, 

 either by measures intended to prevent their entrance 

 into the enclosures where young oysters are spread, or 

 by an active campaign against them by traps and other 

 means of capture. The approved method by which 

 exclusion is very successfully attained is an ingenious 

 system of fencing called blindage invented by Messrs. de 

 Montauge, prominent oyster culturists at Arcachon, and 

 practised very extensively in the parks along the western 

 shores of the basin. 



The park to be safeguarded, which is always that 

 containing the youngest oysters belonging to the parti- 



d 



B 



Fig. 6. — Section to show the Arrangement of Blindage Planking 

 employed to protect young oysters against crabs. 



A. Inside of Enclosure where Oysters (o) are placed ; 



B. Exterior of Enclosure. 



c. Vertical Plank of Enclosure ; 



d. Horizontal plank nailed to edge of c. 



