CHAP. 111.] 



PLAN OF A SUITE OF PONDS. 



93 



metres. This pond contains fish of the second year. A sluice 

 or water-gate (J), placed in the deepest part of the pond, 



PISCICULTURAL ESTABLISHMENT AT BUISSE. 



affords the means of turning the water and the fish con- 

 tained therein into the pond No. 3. Courses of rough stones 

 and weeds line the banks of the pond, and form places of 

 shelter for the fish, besides encouraging the growth of such 

 shell-fish as shrimps, lobsters, etc. The third pond (3) has a 

 surface of about 5000 yards, with a depth equal to that of the 

 second pond. An underground canal (G) runs along the eastern 

 side, and at distances of 2 metres trenches lined with stones 

 loosely thrown together join the canal to the basin, and allow 

 the fish to circulate through these subterranean passages, where 

 every stone becomes a means of shelter and concealment. 

 The adult trout can conceal themselves in the submerged holes 

 and crevices of the islands (F) of which there are three in the 

 pond. The narrowest part of the basin is crossed by a viaduct 

 of 8 metres (N), to the arch of which is fitted an iron grating 

 with rods in grooves to receive either a sluice or a snare. The 



