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Olfactory Sensitivity during Parr and Smolt Developmental Stages of Coho Salmon
Author(s) -
Rehnberg Bradley G.,
Jonasson Brian,
Schreck Carl B.
Publication year - 1985
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1985)114<732:osdpas>2.0.co;2
Subject(s) - smoltification , oncorhynchus , juvenile , biology , zoology , fishery , ecology , salmonidae , salmo , fish <actinopterygii>
The avoidance response of juvenile coho salmon Oncorhynchus kisutch to L‐serine and D,L‐alanine was measured in a two‐choice Y‐trough. Threshold concentration for olfactory detection and avoidance of L‐serine was 10 −8 M for zero‐age parr, 10 −7 M for yearling parr, 10 −5 M for smolts in late April‐early May, and 10 −6 M for smolts in June. Threshold for the avoidance of D,L‐alanine was 10 −7 M for yearling parr, 10 −6 M for smolts in late April‐early May, and 10 −5 M for smolts in June. These data suggest that (1) heightened olfactory sensitivity may not occur during smoltification or (2) smolts may be less disposed than parr to show avoidance behavior.