OS' FISHES IN GENERAL, 
3 1 
In populous countries, like China or Holland., where 
fcvery article of food is in requefl, and every fpot of 
ground is turned to account, great attention is paid to 
the ftrufture and management of filh ponds : There ex- 
perience has taught men to afcertain the quantity of eve- 
ry kind of fiih, which any given fpace of water can fup- 
P°rt. Ninety brace of carp, and forty of tench, may be 
Supported in an acre of water ; a greater number would 
languith and die. In tranfporting full from rivers into 
ponds, it has been found that the young thrive much 
better after tne operation, than the old ; for at that pe- 
riod of life, they poffefs a power of more eafily accom- 
modating themfelves to any change in their fitua- 
tion. 
In fome parts of Germany , where the domeftication of 
is prafticed, the ponds are conflrudted in a fuite, one 
adjoining another ; and, by means of a communication 
between them, they can empty the water of one pond, 
together with the filh, into another. After this is ac- 
complished, the empty one is frequently plowed, and 
fown with barley : When the grain is in the ear, the 
'vater, with its inhabitants, are again admitted to feed 
bpon the grain, and are thus more expeditioufly fattened 
t ian by any other management. In all filh ponds, the 
milters are the preferable fifh, for they become much 
latter than the fpawners. 
1 idi of different fpecies, as well as terminal animals; 
found capable of producing an offspring; but their 
a breeding is a very obfcure article of their hiflory. 
k V ^P ec >cs have hitherto been domeflicated, and on thefe, 
a ver y fmall number of well-attefted experiments 
tf 6 ^ n ° Wn ’ ^ cr °fs breed is faid to be obtained between 
carp and the bream, and between the carp and tench : 
That 
