ll of which had in some way got under some herring net,
which was pegged out carefully over a rearing pond containing trout fry.
I never found out how they got in, but once in they were unable to
escape.

Ponds such as I have described are of course for the fry when they have
reached a certain size, and have already begun to feed well. Other
appliances are necessary for hatching out the ova and for the young fish
when first hatched. A very good apparatus may be made from a champagne
case. This should have large square holes sawn through each end, leaving
enough wood to ensure strength and solidity to the box. The box should
then have two coats of asphalt varnish, and the square apertures covered
with fine perforated zinc. A still better box may be made at a small
cost. This consists of a box with a wooden bottom and perforated zinc
sides which are supported by a stout wooden frame.

Beyond these boxes all that are required are some perforated zinc
hatching trays. These should be 1-1/2 inches deep. They are very easily
made, and the ova hatch out well in them. Though ova sometimes hatch out
very successfully even when piled up in two or three layers, it is safer
to have them in a single layer. The trays should be suspended in the
boxes, and the boxes in the ponds close to the inlets, so that a good
current of water may flow through them. The bottom of the boxes should
be covered with a thick layer of gravel, but the trays are to be used
without gravel. It is advisable to have as much grass as possible round
the ponds, and such trees as willows and alders should also be planted
round them. Willows and alder sticks planted in the early part of the
year come into leaf in the same spring, and afford shade to the young
fish in the summer. Some suitable weeds should also be grown in the
rearing ponds. Water-cress, water-celery, water-lobelia, starwort, and
water-milfoil, are all good. They should be arranged, however, so as to
prevent as much as possible the little fish finding hiding places, and
it is for this reason also that I have recommended slightly sloping
banks when the sides of the ponds are not made of cement. The weeds
should be planted some time before the little fish are turned out of
the boxes.

Finally, I must caution my readers again on one or two points before I
leave the subject of the hatching trays, rearing boxes, and ponds.
Enamel, varnish, or charr all woodwork thoroughly, leaving no speck of
wood bare