scholarly journals Embryonic development of the Baltic sea-trout Salmo trutta L. in buffer solutions

1972 ◽  
Vol 02 (2) ◽  
pp. 3-13 ◽  
Author(s):  
Cecylia Cykowska
Keyword(s):  
Embryonic Development ◽  
Baltic Sea ◽  
Salmo Trutta ◽  
The Baltic Sea ◽  
Sea Trout ◽  
Buffer Solutions ◽  
The Baltic

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.

Survival of reared Atlantic salmon and sea trout in relation to marine conditions of smolt year in the Baltic Sea

2006 ◽  
Vol 80 (2-3) ◽  
pp. 295-304 ◽  
Author(s):  
Irma Kallio-Nyberg ◽  
Eero Jutila ◽  
Erkki Jokikokko ◽  
Irma Saloniemi
Keyword(s):  
Atlantic Salmon ◽  
Baltic Sea ◽  
The Baltic Sea ◽  
Sea Trout ◽  
The Baltic

The Status and Exploitation of Sea Trout on the Finnish Coast of the Gulf of Bothnia in the Baltic Sea

2007 ◽  
pp. 128-138
Author(s):  
E. Jutila ◽  
A. Saura ◽  
I. Kallio-Nyberg ◽  
A. Huhmarniemi ◽  
A. Romakkaniemi
Keyword(s):  
Baltic Sea ◽  
The Baltic Sea ◽  
Sea Trout ◽  
Gulf Of Bothnia ◽  
The Status ◽  
The Baltic

Cormorant impact on trout (Salmo trutta) and salmon (Salmo salar) migrating from the river Dalälven emerging in the Baltic Sea

2009 ◽  
Vol 98 (1-3) ◽  
pp. 16-21 ◽  
Author(s):  
Maria Kristina Boström ◽  
Sven-Gunnar Lunneryd ◽  
Lars Karlsson ◽  
Bjarne Ragnarsson
Keyword(s):  
Baltic Sea ◽  
Salmo Salar ◽  
Salmo Trutta ◽  
The Baltic Sea ◽  
The Baltic

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.

Effects of muscle lipid concentration on wild and hatchery brown trout (Salmo trutta) smolt migration

2012 ◽  
Vol 69 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Stefan Larsson ◽  
Ignacio Serrano ◽  
Lars-Ove Eriksson
Keyword(s):  
Baltic Sea ◽  
Salmo Trutta ◽  
Lipid Concentration ◽  
The Baltic Sea ◽  
Muscle Lipid ◽  
Brown Trout Salmo Trutta ◽  
Migratory Pattern ◽  
Wild Trout ◽  
The Baltic ◽  
Sea Survival

Annually, hatchery programs are releasing millions of salmonid smolts into the Baltic Sea. Recent estimations indicate a decline in smolt sea survival, questioning the ecological and socioeconomic values of these programs. Concurrently, hatchery smolts have increased in lipid concentration. Salmonids display partial migration, and it is suggested that the ratio of migrants/residents is affected by individual smolt energetic status. To test whether the increased energetic status of hatchery smolts could explain the noted decrease in survival, we released wild trout smolts, conventional hatchery smolts, and hatchery smolts of low energetic status into a Baltic Sea river. Using telemetry, we obtained data on the number of successful migrants, their swimming speed, and diel migratory behaviour. A much lower proportion of conventional smolts (30%) successfully migrated to the coast. No difference was found between wild (74%) and hatchery smolts of low energetic status (64%). Furthermore, conventional smolts migrated slower and showed no diel migratory pattern. The results are of high relevance for hatchery programs producing partially migrating fish.

Temporal and spatial sedimentation rate variabilities in the eastern Gotland Basin, the Baltic Sea

Boreas ◽  
2002 ◽  
Vol 31 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Christian Christiansen ◽  
Helmar Kunzendorf ◽  
Kay-Christian Emeis ◽  
Rudolf Endler ◽  
Ulrich Struck ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Sedimentation Rate ◽  
The Baltic Sea ◽  
Gotland Basin ◽  
Temporal And Spatial ◽  
The Baltic

Russian Oil: Production and Exports

2003 ◽  
pp. 136-146
Author(s):  
K. Liuhto
Keyword(s):  
Baltic Sea ◽  
Statistical Data ◽  
Oil Production ◽  
The Baltic Sea ◽  
North West ◽  
The North ◽  
Oil Transportation ◽  
Sea Ports ◽  
The Baltic

Statistical data on reserves, production and exports of Russian oil are provided in the article. The author pays special attention to the expansion of opportunities of sea oil transportation by construction of new oil terminals in the North-West of the country and first of all the largest terminal in Murmansk. In his opinion, one of the main problems in this sphere is prevention of ecological accidents in the process of oil transportation through the Baltic sea ports.

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