4. CHEMORECEPTION
111
B
E
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J
Fig. 9. Effects of infusion of different waters into the nasal cavity upon EEG
activity in the olfactory bulb of an adult spawning salmon: A, Distilled water; B,
tap water; C, home water; D-F, waters from three different lakes. Lines below each
of the records indicate duration of stimuli. Calibration, 50 p V and 1 sec. From Hara
et al. (1965). Copyright 1965 by the American Association for the Advancement of
Science.
stream near the spawning site, and ( 3 ) from a point upstream of the
spawning site. It is suggested that on returning from the sea, the adult
salmon retrace a trail of stimulatory factors, presumably the ones to which
they were imprinted as young fish on their seaward migration (see Hara,
Table I
Specificity of Response to Home Water in Fishes from Three
Spawning Systems"
Water from
Fisheries
Issaquah
soos
Fish from
pondb
Creekb
Creekb
Fisheries pond (Chinook)
100
(4)
0 (4)
2 . 3 f 3 . 1 (4)
Issaquah Creek (silver)
39.1 f 14.5 (3)
100 (3)
6 . 4 f 3 . 5 (3)
Soos Creek (silver)
0
(4)
0 (4)
100
(4)
a From Ueda et al. (1967).
The magnitude of response is represented as a percentage of that to home water
[mean k S.E. (number of animals)].