hatching-jar

(hach’ing-jiir), n. A conical re- ceptacle placed with the apex downward, and containing fish-eggs for hatching. -Encye. Brit., XIX, 128. hatching-trough (hach’ing-tréf), ». A trough for artificially hatching fish-eggs. It is a rectangular wooden trough of convenient lerigth (generally from 10 to 12 feet), and usually 6 or 8 inches deep by 12 to 14 inches wide. ‘The trough is sometimes provided with a transverse screen at the head or upper end, to disperse or generalize the inflowing current of water, and such a screen is always placed at the lower end of the trough, to prevent the escape of the fish. The eggs are hatched either on wire-cloth trays or on gravel spread on the floor of the trough.