FISHERY IMPROVEMENT IN JERSEY. 81 



stored a selected stock of adult fish sufficient to provide the quantit} r 

 of fertilised eggs required for the purposes of the hatcher}'. 

 2nd. A boiler and pumping room. 



3rd. The spawning pond in which the spawners (males and females'! 

 are placed when extrusion of the spawn and milt is about to begin. 



4th. The collector, or system of filters necessary for separating and 

 gathering the floating eggs. 



5th. A main Hatchery-room fitted with the Dannevig floating-egg 

 incubators, capable of dealing efficiently with 56,000,000 eggs of plaice 

 or with 80,000,000 eggs of the cod, at one time. 



The Dannevig apparatus, which is intended for buoyant eggs alone, 

 consists essentially of a wooden box, 8 feet long, 2 ft. 3 in. broad and 

 1 foot deep, and divided into two longitudinal compartments by a 

 partition. Each compartment is again transversely divided into seven 

 others, and in each of these (excepting the end ones) a wooden lid-less 

 box is hinged by one edge to the top of the wooden transverse parti- 

 tion;, the other edge is free, and when water is admitted, rises above 

 the level of the water ; the bottom of each floating box consists of 

 hair-cloth and acts as a sieve. To obviate the permanent eddies and 

 currents caused by the constant course of the inflowing water, Oapt. 

 Dannevig invented a beautifully simple arrangement whereby the rythmic 

 depression of a long lever bearing transverse bars catching the sides 

 of the floating boxes, causes the latter to rise and fall several times per 

 minute ; this breaks up the eddies, and ensures an equal distribution of 

 the eggs through the water. Each box cau accommodate half a million 

 eggs of the cod, or 300,000 eggs of the plaice; each apparatus contains 

 10 of these boxes. A Dannevig incubator can thus deal with five millions 

 of cod eggs simultaneously. 



The output of fry fiom this hatchery in 1895 Avas : — PlaicP, 

 38,615,000; cod, 2,760,000; turbot, 3,800,000 ; miscellaneous, 1,050,000 ; 

 a grand total of 46,225,000. 



It is worthy of note that the authorities consider the services rendered 

 by the Fishery Board for Scotland fully justif3 r the indefinite continuance 

 of the grant of £23,000 per annum. 



In Newfoundland, the great work of hatchery effected at Dildo Island 

 in Trinity Bay, and at various outlying points along the coast, has also 

 special interest for us in Jersey, for while the hatching of cod fry is the 

 chief item in the official programme (221,500.000 being set free in 1894), 

 it is here we have to turn as to the fountain head for information upon 

 the artificial hatching of lobsters. Whereas the cod fry are all hatched 

 out at Dildo, the vast majority of the lobsters are hatched out in 

 numerous small floating wooden incubators stationed up and down the 

 coast. In these boxes the eggs are placed after being stripped from the 



