Ultrastructure of olfactory mucosa in the homing baltic sea trout Salmo trutta trutta

1973 ◽  
Vol 19 (1) ◽  
pp. 74-88 ◽  
Author(s):  
G. Bertmar
Keyword(s):  
Baltic Sea ◽  
Salmo Trutta ◽  
Olfactory Mucosa ◽  
Sea Trout

Genotyping of two populations of Southern Baltic Sea trout Salmo trutta m. trutta using an Atlantic salmon derived SNP-array

2013 ◽  
Vol 9 ◽  
pp. 25-32 ◽  
Author(s):  
Agata Drywa ◽  
Anita Poćwierz-Kotus ◽  
Anna Wąs ◽  
Stefan Dobosz ◽  
Matthew P. Kent ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Baltic Sea ◽  
Salmo Trutta ◽  
Snp Array ◽  
Southern Baltic Sea ◽  
Sea Trout ◽  
Southern Baltic ◽  
Two Populations

Mortality of Baltic sea trout (Salmo trutta) after release from gillnets

2017 ◽  
Vol 34 (1) ◽  
pp. 49-57 ◽  
Author(s):  
L. Veneranta ◽  
T. Pakarinen ◽  
E. Jokikokko ◽  
I. Kallio-Nyberg ◽  
H. Harjunpää
Keyword(s):  
Baltic Sea ◽  
Salmo Trutta ◽  
Sea Trout

Effects of marine conditions, fishing, and smolt traits on the survival of tagged, hatchery-reared sea trout (Salmo trutta trutta) in the Baltic Sea

2007 ◽  
Vol 64 (9) ◽  
pp. 1183-1198 ◽  
Author(s):  
Irma Kallio-Nyberg ◽  
Irma Saloniemi ◽  
Eero Jutila ◽  
Ari Saura
Keyword(s):  
Survival Rate ◽  
Baltic Sea ◽  
Salmo Trutta ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Survival Rates ◽  
Clupea Harengus ◽  
The Baltic Sea ◽  
Sea Trout ◽  
The Baltic

The marine survival of tagged sea trout (Salmo trutta trutta) smolt groups (n  =  236) stocked from 1970 to 2001 in the Baltic Sea was analysed using a linear mixed model. The response variable, survival rate, was associated with smolt size, release date, sea surface temperature in May, and prey fish abundance, and interactions among these factors. The effect of smolt size was in interaction with Baltic herring (Clupea harengus membras) abundance; smolt size had an optimum of about 22 cm in years when herring were abundant, but when herring were less abundant, the survival of larger smolts was higher. Early stocking in warm springs or late stocking in cold springs gave the best survival rates for trout. Changes in return activity or fishing methods have made tag returns a less reliable way of estimating survival during the last 30 years. The actual return rate of undersized fish (<40 cm) compared with their estimated proportion among captured fish decreased over time, which suggests that the survival rate for the later years was probably underestimated. It is likely that we were unable to include all the relevant explanatory variables in the model, as year effects remained significant, suggesting unknown annual variation affecting survival.

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.

scholarly journals Coastal migrations, temporary use of neighbouring rivers, and growth of sea trout (Salmo trutta) from nine northern Baltic Sea rivers

2012 ◽  
Vol 69 (6) ◽  
pp. 971-980 ◽  
Author(s):  
Erik Degerman ◽  
Kjell Leonardsson ◽  
Hans Lundqvist
Keyword(s):  
Baltic Sea ◽  
Salmo Trutta ◽  
Population Decline ◽  
Movement Pattern ◽  
Large Rivers ◽  
Small Rivers ◽  
Sea Trout ◽  
Management Plans ◽  
Length Increment ◽  
The Baltic

Abstract Degerman, E., Leonardsson, K., and Lundqvist, H. 2012. Coastal migrations, temporary use of neighbouring rivers, and growth of Sea trout (Salmo trutta) from nine northern Baltic Sea rivers – ICES Journal of Marine Science, 69: 971–980. The wild migratory trout (Salmo trutta) stocks in the northern Baltic Sea are threatened, and the fishery is thought to play a significant role in the population decline. Therefore, knowledge about the migration patterns of these stocks is needed to develop appropriate management plans. For this reason, we analysed the movement pattern from recaptures of mandatory releases of tagged hatchery-reared trout smolt from nine rivers in the region (1998–2007). The median time from release until recapture was 366 days, and the median migration distance at recapture was 27 km, with a dominating southward direction for northern stocks. Most of the recaptured fish were immature (65%), and recaptures in rivers (55%) dominated over recaptures along the coast (44%). Riverine recaptures were most frequent during autumn–spring. A total of 16% of all recaptures in rivers occurred in non-natal rivers. Straying was about twice as frequent among fish from small rivers as from large rivers. The results from the river Gideälven indicate that using broodstock from other rivers in stocking programmes may lead to a high proportion of strayers. In addition, temporary use of neighbouring rivers was more frequent in large rivers during winter. Growth, in terms of length increment, was high, especially in fish from southern parts of the Baltic, and higher than in neighbouring warmer and more saline sea areas.

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.

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