308 
BULLETIN OF THE BUREAU OF FISHERIES 
BREEDING 
Apparently this species was spawning in our region about the first of June. 
The eggs are known to fall into the abdominal cavity before extrusion, rather than into 
ducts leading from the ovaries to the outside, as is the case in most fishes (Bean, 
T. H., 1903). 
Family COREGOM1D./E, Whitefishes 
3. Leu.cich.thys artedi (Le Sueur). Lake herring; cisco. 
RECORD OF CAPTURE 
No young herring were taken by the survey during the summers of 1928 and 
1929. By the time our collecting trips started the herring had grown to a stage 
where they were able successfully to escape the trawls used. Consequently, it was 
necessary to rely upon rather scanty formalin-preserved hatchery material for a 
study of this species. The following short account will serve only as preliminary 
data toward a complete developmental history to be made later. 
DESCRIPTION 
Egg . — Diameter of preserved hatchery specimens examined varying from 2.0 
to 2.5 millimeters, mostly 2.25 millimeters. The earliest stage obtained measured 
2.25 millimeters, diameter of yolk, 1.8 millimeters, with a colorless early embryo 
reaching halfway around the yolk. Myomeres faintly discernible. 
Pigmentation. — The eggs, although very opaque from preservation, show about 
20 rather large oil globules, deep amber in color on the yellowish yolk. In a later 
stage when the embryo reaches more than once and a half around the yolk and is 
apparently ready to hatch, the top of head becomes heavily pigmented and dorsal 
and ventral brown stripes, characteristic of the newly hatched larva, are prominent. 
Yolk sac is deep yellow, its anterior part filled with a large oil globule, and dark thickly 
distributed chromatophores make their appearance on the underside posteriorly. 
Eyes are dark, and the center of head behind eyes is covered by a diamond-shaped 
patch of small chromatophores. Chromatophores continue, small and stellate, to 
form the double dorsal series to end of body, with a similar ventral series behind the 
vent. 
8.5-9.8-millimeter stage . — Newly hatched. Much like following specimen figured, 
but yolk sac larger and body proportionately more slender. Pigment identical with 
that of the 10.25-millimeter stage. 
10.25-millimeter stage . — Age about 2 days. Total length, 10.25; length to vent, 
6.8; greatest depth behind yolk sac, 0.85; diameter of eye, 0.9 millimeter; myomeres, 
38 to vent plus 19 behind. Embryonic marginal fin fold complete, starting over 
seventeenth myomere, rising, then notching over twenty-ninth myomere, rising again 
