The Rainbow Trout - Runkebjerg.dk

runkebjerg.dk

The Rainbow Trout - Runkebjerg.dk

Four hatching-trays are placed in each trough and are secured by keys or wedges, and shouldbe from 1 to 2 inches lower at the end next to the head of the trough, as shown at D, D, D, D,page 78. If placed in this way, each tray will hold from 12,000 to 15,000 eggs with safety.Muddy water during the hatching season necessitates the use of a tin tray with a perforatedbottom (shown at E, page 78), which is 13 3/4 inches wide and 32 inches long. This sets inside ofthe hatching-trough on feet raising it an inch above the bottom of the trough. The hatching-traycontaining the eggs is placed inside and rests on the brackets shown at G. The fish, as they hatchout, fall from the hatching-tray upon the perforated bottom of the tin tray, and by theirmovements work the sediment through, leaving them on a clean bottom and in no danger ofbeing smothered. The tin trays are also useful in counting fish, or in holding. small lots of fish ofdifferent species in the same trough. Where supplementary trays are not used, the fry fall directlyinto the troughs.Troughs 15 feet long will admit of four hatching-trays in a single row, each of which will

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