344 
BULLETIN OF THE BUREAU OF FISHERIES 
DESCRIPTION 
Egg . — Outer diameter of egg, 1.5 millimeters; diameter of yolk, 1.3 millimeters in 
specimens having large blastodisc formed; yolk very granular, yellowish. 
Figure 53 shows egg with outer diameter, 1.5 millimeters; inner diameter, 1.05 
millimeters; embryo about two-thirds around egg; anterior portion of yolk very large 
and round, followed by an elongated portion beyond which the tail is free; myomeres 
evident from the end of bulbous portion of yolk to tip of tail; optic vesicles, brain 
divisions, and notochord apparent. No chromatophores ; yolk yellow. 
The stage shown in Figure 55 has the embryo coiled more than once around egg, 
tail reaching to back of head; pectorals very well developed; myomeres completely 
formed; pigment confined to eyes. 
Newly hatched larva . — Total length, 4.6; length to vent, 3.0; greatest depth, 1.25; 
diameter of eye, 0.45 millimeters. Myomeres, about 20 to vent plus about 12 behind 
(very incomplete). Characterized by very large club-shaped yolk sac, consisting of 
large bulbous portion without definite oil globules but with some oily substance 
throughout, and narrow, extended posterior portion reaching to vent. Mouth and 
vent not open. Tail lophocercal; embryonic marginal fin originating at about the 
tenth myomere, low and even, continued around caudal to vent; pectorals developed 
but small. 
Pigmentation. — The larva is colorless, except for deep gray eyes with a golden 
tinge, some deep orange over yolk, and two very large stellate chromatophores on 
underside of yolk sac at vent, barely discernible. 
Larva 1 day old . — Total length, 5.0; length to vent, 3.0; greatest depth, 1.0; 
diameterof eye, 0.4 millimeters. Myomeres, 19 before vent plus 14 behind (incomplete). 
Bulbous part of yolk sac reduced and posterior part heavier. Marginal fin fold 
intact, slightly raised before vent, and somewhat notched at caudal peduncle. 
Pigmentation. — A very few large delicate chromatophores occur beneath and on 
sides of yolk sac (some specimens without), an uneven series on ventral aspect from 
vent backward and two chromatophores on lateral line just before vent. 
3 days old . — Total length, 5.5 to 5.7 millimeters. Body much heavier; inter- 
orbital space wide; yolk sac greatly reduced, retaining elongated shape, now tapering 
