Fish Culture (Paperback)

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1883. Not illustrated. Excerpt: ... distributed, by means of a feather along these rows of grilles, and any that are dead are immediately observable, irrespective of which the stream does not congregate them together in masses as is always to be feared unless mechanical obstacles intervene. Livingston Stone remarks that simple charcoal or carbonised troughs are equally as efficacious as grilles and infinitely more economical. He considers the first to be the thing for business, and the second more suitable to the rich man's experiments. Many other descriptions of hatching apparatus for eggs of salmonidae have been employed with success;1 some of them likewise effect a great economy in space, but it generally occurs that, if the amount of water is curtailed, weak young are the result. At Howietoun, where the average temperature of the water is from 410 to 450 Fah, Sir J. GibsonMaitland is in favour of a supply of not less than ten gallons a minute to every 100,000 trout eggs, while, by increasing the flow during the latter stages of incubation, fully 99 per cent, can be hatched, and very nearly as successful results with the eggs of the salmon, the difference being probably due to the difficulty of obtaining perfect impregnation in the case of ova taken from wild fish. The following apparatus for hatching the ova of' Salmonidae is exhibited at the Fisheries Exhibition by Mr. Oldham Chambers, its inventor. It consists (see plate IV., fig. 26) of a long box 6 feet or more in length, 18 inches in width, and 12 inches in depth. The eggs are deposited on perforated zinc trays 15 inches long, with about two inches of water over each. The supply-pipe is fixed under the bottom of the box, 1 Metal substances, unless sufficiently coated to prevent rust or absorption from their surfaces, are unsuitable. and ...