scholarly journals How pathogens affect the marine habitat use and migration of sea trout ( Salmo trutta ) in two Norwegian fjord systems

2020 ◽  
Vol 43 (7) ◽  
pp. 729-746 ◽  
Author(s):  
Robert J. Lennox ◽  
Sindre H. Eldøy ◽  
Knut W. Vollset ◽  
Kristi M. Miller ◽  
Shaorong Li ◽  
...  
Keyword(s):  
Habitat Use ◽  
Salmo Trutta ◽  
Marine Habitat ◽  
Sea Trout ◽  
Norwegian Fjord ◽  
And Migration

scholarly journals Lice pressure from salmon farms on wild sea trout (Salmo trutta) in a Norwegian fjord

2015 ◽  
Vol 2 ◽  
Author(s):  
Arechavala-Lopez Pablo ◽  
Berg Marius ◽  
Uglem Ingebrigt ◽  
Bjorn Pal Arne ◽  
Finstad Bengt
Keyword(s):  
Salmo Trutta ◽  
Sea Trout ◽  
Norwegian Fjord

2. On the Growth and Migration of the Sea-Trout (Salmo Trutta)

1845 ◽  
Vol 1 ◽  
pp. 416-417
Author(s):  
John Shaw
Keyword(s):  
Salmo Trutta ◽  
Sea Trout ◽  
And Migration ◽  
Experimental Ponds

The author has here pursued the same course of experimental enquiry regarding the sea-trout, as that formerly followed in relation to the salmon. Having obtained impregnated ova, from a pair of spawning fish, he conveyed these ova to his experimental ponds. This was on 1st November 1839, and the young were excluded from the egg in 75 days. They resembled salmon of the same age, but were somewhat smaller and paler. They took two years to grow about seven inches, and the majority were then converted into smolts. But about one-fourth did not assume the silvery lustre; and this peculiarity, Mr Shaw thinks, distinguishes a like proportion even in the rivers.

scholarly journals Nutritional correlates of spatiotemporal variations in the marine habitat use of brown trout (Salmo trutta) veteran migrants

2018 ◽  
Vol 75 (10) ◽  
pp. 1744-1754 ◽  
Author(s):  
Xavier Bordeleau ◽  
Jan G. Davidsen ◽  
Sindre H. Eldøy ◽  
Aslak D. Sjursen ◽  
Fred G. Whoriskey ◽  
...  
Keyword(s):  
Habitat Use ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Life Stage ◽  
Nutritional State ◽  
Long Distance ◽  
Marine Habitat ◽  
Species Population ◽  
Brown Trout Salmo Trutta ◽  
Feeding Migration

The brown trout (Salmo trutta) is an iteroparous, anadromous salmonid that exhibits a complex continuum of feeding migration tactics, ranging from freshwater residency, to potamodromy, to estuarine migration, as well as short- to long-distance coastal migrations. While anadromous migrants are believed to play an important role in the species’ population dynamics, little is known about the factors driving differences in the extent of individual marine habitat use. In this study, 32 brown trout veteran migrants were acoustically tagged prior to their seaward migration and sampled for indices of their nutritional state. Our findings suggest that (i) body condition factor differed among fish adopting different migratory tactics, with outer fjord migrant being in poorer condition; and (ii) within migratory groups, plasma triglyceride concentration was negatively correlated with the duration of marine residency. Results support the idea of condition-dependent migration in veteran migrants, with individual variation in nutritional state influencing the spatiotemporal aspects of marine habitat use. Furthermore, overall marine minimum survival during the summer feeding migration was 86%, the highest reported estimate for this life stage.

scholarly journals Short‐term homeostatic regulation of blood/interstitial fluid Ca 2+ concentration by the scales of anadromous sea trout Salmo trutta L. during smoltification and migration

2020 ◽  
Author(s):  
Leanna Jamieson ◽  
Angel Waters ◽  
Kaitlyn E. Ho ◽  
Harvey Y. S. Chan ◽  
Jacky T. Hung ◽  
...  
Keyword(s):  
Salmo Trutta ◽  
Interstitial Fluid ◽  
Homeostatic Regulation ◽  
Short Term ◽  
Sea Trout ◽  
And Migration

scholarly journals Salmon louse infestation in wild brown trout populations generates multi-modal mixture distributions

2020 ◽  
Vol 12 ◽  
pp. 447-456
Author(s):  
OH Diserud ◽  
R Hedger ◽  
B Finstad ◽  
D Hendrichsen ◽  
AJ Jensen ◽  
...  
Keyword(s):  
Habitat Use ◽  
Brown Trout ◽  
Negative Binomial ◽  
Louse Infestation ◽  
Marine Habitat ◽  
Salmon Louse ◽  
Sea Trout ◽  
Salmon Lice ◽  
Temporal Variance ◽  
Spatio Temporal

For successful evaluation of the overall effects of salmon louse infestation on brown trout population dynamics, it is crucial to have a realistic understanding of how lice infestation distributions are generated and how they should be interpreted. Here, we simulated the potential effects of spatio-temporal variance in lice larvae densities, temporal variance in sea trout marine migration timing and spatial variance in marine habitat use on lice infestation distributions. We show that, when sampling populations with individual variation in marine behaviour, e.g. from post-smolts to veteran migrants, we must expect multi-modal mixture lice infestation distributions. Applying standard statistical distributions, such as the Poisson, negative binomial or zero-inflated distributions, can be too simplistic and give biased results. Temporary increases in salmon lice load in a given area may have inconsistent effects among individuals of a population and may be critical for vulnerable groups such as post-smolts, dependent on timing. For many analyses, it will be necessary to resolve the contributions from groups of fish with different lice infestation expectations due to spatio-temporal differences in habitat use within the overall mixture distribution. Another consequence is that different data sources, obtained by different methods or sampled at different locations and periods, must be expected to give different lice infestation distributions, even when sampling the same population. We also discuss additional factors that may complicate the interpretation of salmon lice infestation distributions on sea trout, such as lice-induced mortality, and behavioural changes, such as premature return to less saline water for delousing.

The first months at sea: marine migration and habitat use of sea trout Salmo trutta post-smolts

2016 ◽  
Vol 89 (3) ◽  
pp. 1624-1640 ◽  
Author(s):  
A. C. Flaten ◽  
J. G. Davidsen ◽  
E. B. Thorstad ◽  
F. Whoriskey ◽  
L. Rønning ◽  
...  
Keyword(s):  
Habitat Use ◽  
Salmo Trutta ◽  
Sea Trout ◽  
Marine Migration

Mark-recapture estimation of mortality and migration rates for sea trout (Salmo trutta) in the northern Baltic sea

2016 ◽  
Vol 74 (1) ◽  
pp. 286-300 ◽  
Author(s):  
Rebecca E. Whitlock ◽  
Juho Kopra ◽  
Tapani Pakarinen ◽  
Eero Jutila ◽  
Adrian W. Leach ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Salmo Trutta ◽  
Mortality Rates ◽  
Fish Population ◽  
Fishing Mortality ◽  
Recreational Fisheries ◽  
Sources Of Information ◽  
Mark Recapture ◽  
Sea Trout ◽  
And Migration

Knowledge of current fishing mortality rates is an important prerequisite for formulating management plans for the recovery of threatened stocks. We present a method for estimating migration and fishing mortality rates for anadromous fishes that combines tag return data from commercial and recreational fisheries with expert opinion in a Bayesian framework. By integrating diverse sources of information and allowing for missing data, this approach may be particularly applicable in data-limited situations.Wild populations of anadromous sea trout (Salmo trutta) in the northern Baltic Sea have undergone severe declines, with the loss of many populations. The contribution of fisheries to this decline has not been quantified, but is thought to be significant. We apply the Bayesian mark-recapture model to two reared sea trout stocks from the Finnish Isojoki and Lestijoki Rivers. Over the study period (1987–2012), the total harvest rate was estimated to average 0.82 y–1 for the Isojoki River stock and 0.74 y−1 for the Lestijoki River stock. Recreational gillnet fishing at sea was estimated to be the most important source of fishing mortality for both stocks, particularly during the 1980s and 1990s. Our results indicate a high probability of unsustainable levels of fishing mortality for both stocks, and illustrate the importance of considering the effect of recreational fisheries on fish population dynamics.

Stocking impact and migration pattern in an anadromous brown trout (Salmo trutta) complex: where have all the stocked spawning sea trout gone?

2004 ◽  
Vol 13 (6) ◽  
pp. 1433-1445 ◽  
Author(s):  
Daniel E. Ruzzante ◽  
Michael M. Hansen ◽  
Dorte Meldrup ◽  
Kaare M. Ebert
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Migration Pattern ◽  
Sea Trout ◽  
Brown Trout Salmo Trutta ◽  
And Migration

Present Status of the Salmonids Atlantic Salmon and Sea-Trout in the Dutch Part of the River Rhine

1994 ◽  
Vol 29 (3) ◽  
pp. 37-41 ◽  
Author(s):  
W. G. Cazemier
Keyword(s):  
Atlantic Salmon ◽  
Salmo Trutta ◽  
Natural Populations ◽  
River Rhine ◽  
Sea Trout ◽  
The Past ◽  
The North ◽  
Trout Population ◽  
The North Sea ◽  
Heavy Pollution

In the past, the anadromous salmonids, Atlantic salmon (Salmo salar) and sea-trout (Salmo trutta), have formed natural populations in the river Rhine. From the beginning of the nineteenth century onwards, the greater part of the drainage area of the river has been gradually altered from a more or less rural and agricultural area, into a highly industrialised one with subsequent industrialisation, river-engineering and heavy pollution. These developments are considered to be the major cause for the disappearance of the populations of anadromous salmonid fish in the 1950s. The water quality has recovered significantly during the past 25 years. From about 1975 onwards, this process gave rise to a recovery of the anadromous trout population. Results of recent studies of the sea-trout migration pattern are presented. They reveal that nowadays these salmonids can complete their up- and downstream migrations from the North Sea to places, situated at hundreds of kilometres upward the river and vica versa. The numbers of recorded Atlantic salmon and catch locations in inland waters are presented. They show a significant increase since 1989. These phenomena can be understood as promising signs of the recovery of the Rhine aquatic ecosystem.

Sign in / Sign up

Export Citation Format

Share Document