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.

Influence of Sea Temperature upon the Numbers of Grilse and Multi-Sea-Winter Atlantic Salmon (Salmo salar) Caught in the Vicinity of the River Dee (Aberdeenshire)

1985 ◽  
Vol 42 (9) ◽  
pp. 1513-1521 ◽  
Author(s):  
J. H. A. Martin ◽  
K. A. Mitchell
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
The Arctic ◽  
Average Weight ◽  
Regression Equations ◽  
Catch Per Unit Effort ◽  
Data Set ◽  
Sea Temperature ◽  
Atlantic Salmon Salmo Salar ◽  
High Seas

The possible influence of sea temperature upon the age of return of Atlantic salmon (Salmo salar) was examined using the catch and weight data of grilse and multi-sea-winter (MSW) salmon of the Aberdeen Harbour Board caught either within or adjacent to the River Dee (Aberdeenshire). This data set, apart from a 10-yr period of commercial confidentiality, is very suitable because uniformity of effort allowed catch per unit effort to be calculated. Only in the last few years was external pressure (high seas fishing) applied to the system. Various temperature series were examined but the known loci of high seas fishing and the temperature ranges involved suggested that the most relevant series is from the subarctic. Increase in temperature is shown to be associated with larger numbers of fish returning as MSW salmon and fewer as grilse. The average weight of grilse increases with grilse catch numbers. Regression equations for grilse and MSW salmon catch numbers are produced for the period 1877–1972. There is a marked 4-yr periodicity in the grilse catch data. A hypothesis is proposed that the temperature of the subarctic influences the migratory pattern, that fish travel further north into the Arctic/subarctic only during those years when the minimum temperature remains above 2 °C.

Fyke Net Catches as Indices of the Abundance of Brook Trout, Salvelinus fontinalis, and Atlantic Salmon, Salmo salar

1984 ◽  
Vol 41 (2) ◽  
pp. 377-380 ◽  
Author(s):  
P. M. Ryan
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Relative Abundance ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Catch Per Unit Effort ◽  
Small Lakes ◽  
Population Densities ◽  
Atlantic Salmon Salmo Salar ◽  
Fyke Nets

The catch per unit effort (CPUE) data of brook trout (Salvelinus fontinalis) and Atlantic salmon (Salmo salar) in fyke nets set in two small lakes in central Newfoundland were compared with population densities estimated with Schnabel multiple mark–recapture experiments each spring and fall from 1978 to 1982. The catchability of brook trout did not differ significantly between lakes or seasons, and CPUE was an index of the relative abundance of trout within and between lakes. In contrast, the catchability of Atlantic salmon differed greatly between lakes and varied seasonally, being greater in the spring but less in the fall than the catchability of brook trout. Comparisons of relative salmon abundance between lakes or of the relative abundance of brook trout to Atlantic salmon within or between lakes require a correction for seasonal differences in the catchability of salmon.

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.

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

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.

Changes in Mean Weight, Sea-Age Composition, and Catch-per-Unit-Effort of Atlantic Salmon (Salmo salar) Angled in the Godbout River, Quebec, 1859–1983

1986 ◽  
Vol 43 (2) ◽  
pp. 281-287 ◽  
Author(s):  
Alex T. Bielak ◽  
Geoffrey Power
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Age Groups ◽  
Fishing Effort ◽  
Commercial Fisheries ◽  
Catch Per Unit Effort ◽  
Age Composition ◽  
Atlantic Salmon Salmo Salar ◽  
The Mean ◽  
Selective Effects

A weight-age classification, based on recent catches, was retroactively applied to angled Atlantic salmon (Salmo salar) catches recorded in the log of the Godbout salmon club between 1859 and 1983. Over this period, numbers of salmon caught have fluctuated with a periodicity of 20–30 yr but catches have been maintained. There has been a big increase in fishing effort, and the proportion of two-sea-year to previously spawned fish has increased. The mean weight of these age groups has declined 0.005–0.009 kg∙yr−1. These changes are attributed to the selective effects of commercial fisheries on the stock.

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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