10
Light-adapted
5
r
P.
i
A
1
m.
A
V .
V
i
J
0 . n . i .
A
P.
f
t
I
m.
F. W. MUNZ
Dark-adapted
b l
J
Fig. 3. The retina of Clupea drawn semidiagrammatically in the dark- and lightadapted state. Key: bJ., bipolar layer; c., cone; e., ellipsoid; e l m . , external limiting
membrane; ni., length of cone inyoids; o.n.l., outer nuclear layer; o.s., outer segment;
p., pigment epithelium; r., rod; and v., visual cell layer. From Blaxter and Jones
(1967).
Additional information on photomechanical responses has recently
been published by several authors. In young Oncorhynchus, light adaptation is complete in 20-25 min, but dark adaptation takes about an hour
(Brett and Ali, 1958). As the salmon grow older, the time for light adap-
Light-adapted
5
r
P.
i
A
1
m.
A
V .
V
i
J
0 . n . i .
A
P.
f
t
I
m.
F. W. MUNZ
Dark-adapted
b l
J
Fig. 3. The retina of Clupea drawn semidiagrammatically in the dark- and lightadapted state. Key: bJ., bipolar layer; c., cone; e., ellipsoid; e l m . , external limiting
membrane; ni., length of cone inyoids; o.n.l., outer nuclear layer; o.s., outer segment;
p., pigment epithelium; r., rod; and v., visual cell layer. From Blaxter and Jones
(1967).
Additional information on photomechanical responses has recently
been published by several authors. In young Oncorhynchus, light adaptation is complete in 20-25 min, but dark adaptation takes about an hour
(Brett and Ali, 1958). As the salmon grow older, the time for light adap-