298 FISH CULTURE. 
at once be seen that a great gain will be made in the 
number hatched from the spawn of each mother; and if, 
farther, the young fish can be protected from their ene- 
mies until they have acquired size, strength, and agility 
sufficient to care for themselves, another gain will be thus 
effected. These two problems are among the most im- 
portant with which Pisciculture has to deal, but have, we 
think, been satisfactorily solved. 
An interesting experiment was made in Sweden in 
1761, by Pharies Frederick Lund. He obtained some 
breams, perch, and mullets, with mature spawn, and 
placed them in large submerged or floating wooden boxes, 
in which he had placed quantities of pine boughs. In 
these boxes the fish were kept several days, until they had 
completed the process of spawning; they were then re- 
moved. The eggs had ‘adhered to the boughs. ‘These 
species hatch quickly, and in a short time multitudes of 
young fish emerged from the boughs. In this way he 
obtained from fifty female breams, 3,100,000 young; 
from one hundred female perch, 3,215,000 young; and 
from one hundred female mullets, 4,000,000 young. 
These are certainly wonderful results. They were placed 
in the Lake of Rexen, and dismissed to care for them- 
selves. In a similar way those species, like the trout, 
whose eggs fall free from each other to the bottom of the - 
stream, may be made to spawn in places where it will be 
convenient to protect them by enclosures from maraud- 
ers; and, with a suitable arrangement of small ponds 
and streams, the young fry of all species may be sepa- 
rated from the old ones that would devour them. 
- But the crowning discovery in Pisciculture was that of 
artificial fecundation. This discovery was made during 
the last century, but was turned -to no practical account, 
