Auicrican FisJirrics Societi/ 211) 



appearance of the abdonu'ii wlK'tluT her eggs are rii)e, and then, 

 if she is ready, swinging her head nnder his left arm so as to 

 allow the left hand to be used in jjressing the abdomen, ho holds 

 lu>r over the ])an and, as soon as her lirst struggling is owr, 

 ])resses out the s])awn in a leisurely way taking, however, rarely 

 more than ten minutes in the o})eration. As soon as the female 

 has yielded her eggs a male is taken in the same way and his milt 

 expressed npon the eggs. The eggs and milt are then thoroughly 

 mixed together by shaking and wliirling tlu' ])an aliout. Then 

 for the first time water is added by a sei-ond operator, who re- 

 ])eats the mixing motions and very shortly washes the milt all 

 otf, hlls up with elean water and sets the pan of eggs on a shelf 

 to swell. This ])rooess being completed, the eggs are, as soon as 

 convenient, generally after the lapse of several hours, sjn-ead 

 u)H)n the wire-cloth trays on which they are to be incubated, 

 enclosed in light-tight boxes and transferred to the hatchery, 

 which ti-ansfer involves carrying over rough ground l)y foot-por- 

 ters and I)y b.oat across a lake, a total distance of nearly two 

 miles. 



Arrived at the hatchery, the eggs are removed from tlu' I)ox 

 and, on the same trays on whit-h they are ))rought, are placed 

 in movable frames in wooilen troughs fed by water fi-om a brook 

 whose source is a small lake of exceptional purity located at a 

 much greater elevation, from which the water comes tund)ling 

 down over rocks and U'dges and arrives at the hatchery well 

 aerated. The temperature of this water during the past vear 

 ranged from 50° F. at the end of Octolier and a mean of 42.0° 

 F. in jSTovember to a mean of 33.2° F. in February : being a little 

 more than one degree warmer through March and attaining a 

 mean of 36.6° F. in April and 45.5° F. in May. The progress 

 of development is of course very sIoav in such cool watt'r. and 

 the period of incubation is about five months. 



The water in the troughs has altogether a horizontal flow. 

 The trays are constructed in such a way that while resting on 

 each other at the coriiers there are narrow interstices betwcn 

 them reaching across each side, which are suthcient to a(hnit 

 water in ample volume to nourish the eggs. l)ut not det'ip enough 

 to allow salmon eggs to be washed out should the fiow be ex- 

 c;'.-si\-c. Jn this svstem no use whatever is made of vt'rtical cur- 



