scholarly journals Sea trout Salmo trutta in the subarctic: home‐bound but large variation in migratory behaviour between and within populations

2021 ◽  
Author(s):  
John Fredrik Strøm ◽  
Jenny L. A. Jensen ◽  
Anna Nikolopoulos ◽  
Eivind Nordli ◽  
Pål Arne Bjørn ◽  
...  
Keyword(s):  
Salmo Trutta ◽  
Migratory Behaviour ◽  
Sea Trout

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.

Cytological status of the gonads and the level of thyroid and sex hormones in juvenile Black Sea trout, Salmo trutta labrax, of two phenotypic forms

2014 ◽  
Vol 54 (7) ◽  
pp. 476-484 ◽  
Author(s):  
D. S. Pavlov ◽  
E. D. Pavlov ◽  
E. V. Ganzha ◽  
V. V. Kostin ◽  
V. Yu. Ponomareva
Keyword(s):  
Sex Hormones ◽  
Black Sea ◽  
Salmo Trutta ◽  
Sea Trout ◽  
Phenotypic Forms

scholarly journals Environmentally sustainable feeding system for sea trout (Salmo trutta m. trutta): Live food and insect meal-based diets in larval rearing

2021 ◽  
Vol 21 ◽  
pp. 100795
Author(s):  
Lilianna Hoffmann ◽  
Mateusz Rawski ◽  
Ewa Pruszyńska-Oszmałek ◽  
Paweł Kołodziejski ◽  
Jan Mazurkiewicz
Keyword(s):  
Salmo Trutta ◽  
Live Food ◽  
Larval Rearing ◽  
Feeding System ◽  
Environmentally Sustainable ◽  
Sea Trout

scholarly journals The importance of being familiar: individual recognition and social behavior in sea trout (Salmo trutta)

1998 ◽  
Vol 9 (5) ◽  
pp. 445-451 ◽  
Author(s):  
Johan Höjesjö ◽  
Jörgen I. Johnsson ◽  
Erik Petersson ◽  
Torbjörn Järvi
Keyword(s):  
Social Behavior ◽  
Salmo Trutta ◽  
Individual Recognition ◽  
Sea Trout

scholarly journals Documentation of multiple species of marine fish trapped in Atlantic salmon sea-cages in Norway

2018 ◽  
Vol 31 ◽  
pp. 31
Author(s):  
Per Gunnar Fjelldal ◽  
Monica F. Solberg ◽  
Kevin A. Glover ◽  
Ole Folkedal ◽  
Jonatan Nilsson ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Trutta ◽  
Gadus Morhua ◽  
Mesh Size ◽  
Anguilla Anguilla ◽  
Wild Fish ◽  
Melanogrammus Aeglefinus ◽  
European Eel ◽  
Farmed Salmon ◽  
Sea Trout

The production of salmonids in sea-cages has been developed for monoculture of the target species. However, we show here for the first time, that wild fish may enter sea-cages used for farming of Atlantic salmon (Salmo salar L.) in Norway, out-grow the mesh size, and thereafter become permanently trapped. Within seven different sea-cages located in western Norway, eight different species of wild fish were identified; European eel (Anguilla anguilla), sea trout (Salmo trutta L.), cod (Gadus morhua), haddock (Melanogrammus aeglefinus), saithe (Pollachius virens), pollack (Pollachius pollachius), hake (Merluccius merluccius) and whiting (Merlangius merlangus). In the two most extreme cases, a 5 × 5 × 7 m cage with 311 farmed salmon (903 g) also contained 542 whiting (79 g), 77 haddock (43 g), and 5 cod (26 g), and a 12 × 12 × 15 m cage with 1695 farmed salmon (559 g) also contained 1196 haddock (35 g), 1115 whiting (31 g), 46 cod (23 g), 23 saithe (48 g), 15 pollock (22 g), 5 sea trout (54 g), and 2 hake (29 g). The present study thus demonstrates that aquaculture cages designed for monoculture may attract and effectively ‘trap’ wild fish. We did not investigate the frequency of this occurrence, and the ecological significance of these observations remains unclear. However, with the ever-increasing number of sea-cages used for global aquaculture, this is clearly a topic for further research.

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