44 PERCH—PROFIT MADE BY FISH. [PART TI. 
Perch do not appear to grow to a large size 
in his waters, not running commonly to more than 
a pound weight, although, from the large number 
taken with rod and line, as much sometimes as 
forty pounds weight to a single rod in a day, 
they may scarcely have a fair chance of obtaining 
their full dimensions. Thinking however that his 
breed is an indifferent one, Mr Maltby has crossed 
it with some from the Meuse, by which he hopes 
to improve it. Similarly, with a view of improv- 
ing his breed of Carp, he has imported some 
from the Rhine, whereby he has already obtained 
a very handsome cross in point of shape and 
colour, besides an actual improvement in the 
quality of the fish. 
Every year, or every two years, he has a sale 
of his fish, as well to cover rent and current ex- 
penses, as because he gains nothing on large fish, 
these not being marketable. 
The profit made is upon those which weigh 
three quarters of a pound when put in, and from 
two pounds and a half to three pounds and a half 
when taken out, so that he only saves such fish, 
above those weights, as are peculiarly handsome 
in shape and colour. The whole of his waters, 
collectively, thus contain (with the exception of 
