Sveriges lantbruksuniversitet
Swedish University of Agricultural Sciences

Knowledge bank: Water, aquaculture and fish

Fungi and mussels acceptable in fish feed

Farmed predatory fish (salmon, cod, etc.) need large quantities of food, which at present consists of wild-caught marine fish species that are endangered to varying degrees. (2012-04-25)

Spotlight on photosynthesis in marine plankton

Marine phytoplankton account for half of all carbon fixed during photosynthesis. This means that these microorganisms have a major impact on the earth’s carbon flows. (2012-04-20)

Clever fishing part of the solution

Eutrophication of the Baltic Sea is a growing problem. The emission of nutrients to the sea has to be reduced, but better management of fisheries is also required. To implement ecosystem-based management in the future, researchers at SLU are trying to understand the role of fish in the food chain. (2012-03-07)

Robust computer model for load calculations

The "Fyris" model is a calculation model capable of mapping transport and source distribution of nitrogen and phosphorus from a catchment to the sea. (2011-08-19)

Genetic identification to protect fish

SLU researchers have been counting young salmon and brown trout on their way to the sea in a forest river called Sävarån. (2011-08-18)

What natural environment do we want?

SLU researchers have played an important role in Sweden’s 150 year long history of environmental acidification, for instance the acidification process was first shown by soil researcher Svante Odén in the 1960s. Reduced sulphur emissions and thereby less acid deposition, makes land and water areas in Sweden now recovering from the acidification that started already during the 19th century. But towards... (2011-07-11)

Diatoms indicate water quality

SLU in Uppsala now has an accredited laboratory capable of analysing diatoms from watercourses. (2011-07-06)

Later coastal fishing favours wild salmon

Robust salmon stocks in the Baltic Sea are possible with the right knowledge and fishing methods, as suggested by Professor Hans Lundqvist and Associate Professor Kjell Leonardsson at the Department of Wildlife, Fish and Environment at the Swedish University of Agricultural Sciences (SLU). (2011-06-23)

Surveying the occurrence of hermaphrodite roach (Rutilis rutilis)

British studies have revealed that a large proportion of roach found in waters close to municipal sewage works are hermaphrodite. (2011-05-11)

Forest Harvesting Resulted in Unexpectedly Low Mercury Export

Professor Kevin Bishop and Ph D student Karin Eklöf at the Swedish University of Agricultural Sciences (SLU) participate in a project on the effects on nearby watercourses after a complete felling in a catchment area. (2011-03-21)

Air Samples Capture More Pesticides

The environmental monitoring of pesticides in Sweden now includes air samples, beside water samples. (2010-12-01)

Medications Leak from Manure to the Environment

What are the environmental effects of veterinary medications on wildlife? (2010-11-30)

Working towards a Non-Toxic World

Leif Norrgren is Professor at SLU with a strong international commitment to environmental issues. He collaborates with people all over the world in projects concerning toxic substances and pathogens connected to water. (2010-11-26)

Emissions trading around Baltic basins

Toxic algal blooms, dead sea bottoms and declining fish stocks have become a daily reality for people living along the shores of the Baltic Sea. Agreements reached thirty years ago to reduce emissions of nutrients, particularly those of phosphorus and nitrogen, have not yielded the desired results. (2010-05-07)

Diatoms reflect lake quality

Stationary diatoms reveal whether a river or stream is eutrophied, acidified or affected by organic pollutants. Researchers at SLU in Uppsala are now determining whether the method using diatoms as an indicator in watercourses also works in lakes. (2009-11-30)

New growth model for perch farms

Farmed perch are highly sensitive to shade and other stress factors. (2009-10-23)

Browner water with less acidification

As sulphur deposition decreases, our lakes and watercourses are becoming ever browner, an effect caused by humus from surrounding land. (2007-12-10)

Sesamine improves farmed fish

Farmed rainbow trout ( Oncorhynchus mykiss ) and salmon ( Salmo salar ) grow just as well when fed with food whose fat content comprises 75 per cent rape oil and only 25 per cent fish oil. Levels of the healthy marine omega-3 fatty acids DHA and EPA decrease in these fish, however. SLU researchers have now tested various bioactive substances from the plant kingdom and their ability to influence fish... (2007-11-06)

Lack of nitrate in blooming lakes

Massive algal blooms occur in eutrophic lakes and the Baltic Sea during warm summers. The algae are often cyanobacteria, also known as blue-green algae. (2007-09-25)