Atlantic salmon living on the edge: Smolt behaviour and survival during seaward migration in River Minho

2020 ◽  
Vol 30 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Hugo Flávio ◽  
Pablo Caballero ◽  
Niels Jepsen ◽  
Kim Aarestrup
Keyword(s):  
Atlantic Salmon ◽  
Seaward Migration

Imprinting and Homing of Atlantic Salmon (Salmo salar) Kelts

1989 ◽  
Vol 46 (4) ◽  
pp. 714-719 ◽  
Author(s):  
J. R. Foster ◽  
C. B. Schom
Keyword(s):  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
Release Site ◽  
Behavioral Changes ◽  
Salmon River ◽  
Delayed Release ◽  
Atlantic Salmon Salmo Salar ◽  
Seaward Migration ◽  
Passamaquoddy Bay

Experiments were conducted to determine if a process similar to imprinting occurs during each seaward migration of Atlantic Salmon (Salmo salar). Displaced Atlantic salmon kelts homed to the site from which they had previously emigrated to sea as smolts (Big Salmon River, New Brunswick, Canada) and did not home to their release sites, or their overwintering sites 150 km away. Delaying release of kelts past the time of normal seaward migration did not cause the behavioral changes associated with interference of the imprinting process described for smolts. Delayed release kelts did not remain near their seawater or estuarine release sites, home to their release sites, or non-selectively home to suitable spawning streams near their release sites. Delayed released kelts travelled away from the release site faster than kelts released during their normal time of seaward migration, but they did not return either to Passamaquoddy Bay or their natal stream in the calendar year of their release (the normal time for this stock) or in subsequent years.

Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon?

1993 ◽  
Vol 42 (4) ◽  
pp. 541-550 ◽  
Author(s):  
F. Okland ◽  
B. Jonsson ◽  
A. J. Jensen ◽  
L. P. Hansen
Keyword(s):  
Atlantic Salmon ◽  
Brown Trout ◽  
Threshold Size ◽  
Seaward Migration

scholarly journals Basin-scale phenology and effects of climate variability on global timing of initial seaward migration of Atlantic salmon (Salmo salar)

2013 ◽  
Vol 20 (1) ◽  
pp. 61-75 ◽  
Author(s):  
Jaime Otero ◽  
Jan Henning L'Abée-Lund ◽  
Ted Castro-Santos ◽  
Kjell Leonardsson ◽  
Geir O. Storvik ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Climate Variability ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Basin Scale ◽  
Seaward Migration

Prediction of Angler Success in an Atlantic Salmon, Salmo salar, Fishery Two Fishing Seasons in Advance

1986 ◽  
Vol 43 (12) ◽  
pp. 2531-2534 ◽  
Author(s):  
Patrick M. Ryan
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Catch Per Unit Effort ◽  
Atlantic Salmon Salmo Salar ◽  
Unit Effort ◽  
Seaward Migration

The number of young Atlantic salmon, Salmo salar, in the spring in two lakes at the headwaters of the Gander River, Newfoundland, was positively correlated (r = 0.99) with the number of smolts in the subsequent seaward migration over a 5-yr period. Angler success (catch per unit effort) in the grilse fishery on the Gander River over a 7-yr period was positively correlated (r = 0.81) with the number of young in the lakes prior to the opening of the angling season of the previous year. Measures of the abundance of young salmon in freshwaters prior to the smolt run can be used to predict the size of the smolt run and allow for compensatory modifications to the adult fishery a year in advance of acticipated low adult returns.

Downstream migration in Atlantic salmon (Salmo salar) smolt sibling groups

2004 ◽  
Vol 61 (3) ◽  
pp. 328-331 ◽  
Author(s):  
K Håkan Olsén ◽  
Erik Petersson ◽  
Bjarne Ragnarsson ◽  
Hans Lundqvist ◽  
Torbjörn Järvi
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Kin Recognition ◽  
Juvenile Fish ◽  
Downstream Migration ◽  
Migratory Behaviour ◽  
Atlantic Salmon Salmo Salar ◽  
Seaward Migration ◽  
Structured Groups ◽  
Experimental Stream

Previous studies have shown kin recognition abilities in salmonid fish. Some authors have suggested that the attraction of juvenile fish to siblings may indicate preference for shoaling with kin. The aim of the present study is to test the prerequisite for the hypothesis that siblings swim spatially closer than unrelated fish during their seaward migration as smolts. Atlantic salmon (Salmo salar) eggs from three families were each reared in two tanks to create familiar and unfamiliar sibling smolts. Before the experiment started they were tagged individually withpassive integrated transponders (PITs). Twelve individuals from each of six groups were mixed and released together at several occasions in the upper end of the 400-m-long experimental stream. An automatic PIT-monitoring system placed in the outlet recorded the time for passage of each individual leaving the stream. Eighty-five percent of the juveniles monitored by the PIT antenna showed downstream migration at night hours and they migrated significantly more often closer in time to both known and unknown siblings than to unrelated fish. The results suggest that there is a genetic component in the migratory behaviour of Atlantic salmon smolts and support the hypothesis that smolts migrate in kin-structured groups.

Influence of Parr Maturity on Emigration of Smolting Atlantic Salmon (Salmo salar)

1989 ◽  
Vol 46 (3) ◽  
pp. 410-415 ◽  
Author(s):  
L P. Hansen ◽  
B. Jonsson ◽  
R. I. G. Morgan ◽  
J. E. Thorpe
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Sexual Maturity ◽  
Release Site ◽  
Atlantic Salmon Salmo Salar ◽  
Seaward Migration

Sexual maturity of parr reduces the probability of a future seaward migration. In release experiments in two separate years with Atlantic salmon in the Imsa River, Norway, immatures migrated sooner and in significantly higher proportions (P < 0.001) than did previously mature males. Furthermore, higher proportions of 2-yr olds than of 1-yr olds migrated, and 86–92% of the descent occurred at night. Large 2-yr olds migrated before smaller ones. Among those which did not migrate, some (3.2% of those released in 1986) were recaptured in the autumn, of which 91.9% were mature males. At Lussa, Scotland, 5.6 and 5.9% of smolting fish released in two separate years remained resident at the release site throughout the summer, and 91.8 and 93.4% of these matured in the autumn of the release year.

Observations on the seaward migration of Atlantic salmon (Salmo salar L.) smolts through a large lake as determined by radiotelemetry and Carlin tagging studies

1988 ◽  
Vol 66 (3) ◽  
pp. 685-691 ◽  
Author(s):  
C. E. Bourgeois ◽  
M. F. O'Connell
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Swimming Speed ◽  
Large Lake ◽  
Atlantic Salmon Salmo Salar ◽  
Seaward Migration ◽  
The Hours

Seaward movements of Atlantic salmon (Salmo salar L.) smolts through Red Indian Lake were studied using radiotelemetry and Carlin tagging. Movements of smolts through the lake occurred between the hours of 20:00 and 04:30 as determined from radiotelemetry. Carlin tagging revealed a net swimming speed ranging from 1.8 to 15.6 km/day; radiotelemetry revealed a rate of <1.0 to 11.2 km/day. Smolt movement through Red Indian Lake and other large insular Newfoundland lakes might be achieved through active migration as opposed to passive displacement. This aspect is discussed in the context of insular Newfoundland stocks for which extensive use of lakes by juveniles for rearing has been demonstrated.

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