Occurrence of wild chum salmon fry in the surf zone, and spawning and emergence timing in the adjacent nonstocked river in Niigata Prefecture, Japan

In an experiment in incubation channels at Robertson Creek, B.C., survival of chum salmon from planting of eggs to emergence of fry was higher in large gravel (2–4 inches, 5.1–10.2 cm) than in small gravel (0.4–1.5 inches, 1.0–3.8 cm). Neither condition coefficient nor timing of emergence was affected by gravel size. There were no significant effects of egg burial depth (8 and 12 inches, 20.3 and 30.5 cm) or density (50 and 100 per treatment) on condition coefficient, or timing of emergence.

Download Full-text

Localization of Cortisol Receptor in Branchial Chloride Cells in Chum Salmon Fry

General and Comparative Endocrinology ◽

10.1006/gcen.1997.7019 ◽

1998 ◽

Vol 109 (2) ◽

pp. 175-185 ◽

Cited By ~ 53

Author(s):

Katsuhisa Uchida ◽

Toyoji Kaneko ◽

Masatomo Tagawa ◽

Tetsuya Hirano

Keyword(s):

Chum Salmon ◽

Chloride Cells ◽

Salmon Fry

Download Full-text

Behavioral Ecology of Chum Salmon Fry (Oncorhynchus keta) in a Small Estuary

Journal of the Fisheries Research Board of Canada ◽

10.1139/f74-012 ◽

1974 ◽

Vol 31 (1) ◽

pp. 83-92 ◽

Cited By ~ 15

Author(s):

J. C. Mason

Keyword(s):

Fresh Water ◽

Behavioral Ecology ◽

Chum Salmon ◽

Oncorhynchus Keta ◽

Natural Systems ◽

Active Selection ◽

Resource Managers ◽

Salmon Fry ◽

Seaward Migration ◽

And Behavior

Chum salmon fry (Oncorhynchus keta) in the estuary of a small coastal stream exploited fresh water, estuarine, and marine food chains and, by so doing, were exposed to marked, daily fluctuations in salinity that demanded active selection of fresh water on ebbing tides day and night. The resulting delay in seaward migration and associated behavioral observations are inadequately reflected in published accounts of the life history and behavior of chum fry in natural systems and laboratory situations, and the downstream displacement theory. The biological basis for delayed seaward migration of chum fry merits the attention of fishery researchers and resource managers alike.

Download Full-text

Reactions of Juvenile Pacific Salmon to Light

Journal of the Fisheries Research Board of Canada ◽

10.1139/f57-036 ◽

1957 ◽

Vol 14 (6) ◽

pp. 815-830 ◽

Cited By ~ 25

Author(s):

W. S. Hoar ◽

M. H. A. Keenleyside ◽

R. G. Goodall

Keyword(s):

Chum Salmon ◽

Pacific Salmon ◽

Pink Salmon ◽

Low Light ◽

Salmon Fry ◽

Experimental Apparatus ◽

Schooling Behaviour ◽

Marked Preference ◽

Juvenile Pacific Salmon ◽

Changing Light

When given a choice between light and dark areas, schools of chum or pink salmon fry remain in the light, sockeye fry prefer the dark and coho fry show no marked preference for either. Newly emerged sockeye fry are the most strongly photonegative, remaining mostly under stones. Older sockeye fry move more into the light. Sockeye and coho smolts stay in the dark more than sockeye and coho underyearlings. Territorial and "escape" behaviour by fish in the experimental apparatus may obscure these reactions to light. Soon after emerging from the gravel, pink fry swim near the surface under low light intensity and retreat to deeper water in brighter light. Older pink fry seem indifferent to changing light. Recently emerged chum salmon fry do not respond in this way to changing illumination, although older fry tend to swim closer to the surface. This difference between pink and chum salmon fry may be related to differences in schooling behaviour and alarm responses of the two species.

Download Full-text