Torhamnsfjarden i Blekinge skargard ar sedan 2002 ett nationellt referensomrade for Sodra Ostersjon. Har bedrivs arligen en omfattande och integrerad kustfiskovervakning i syfte att kartlagga fiskb ...

Kvadofjarden i sodra Ostergotland ar sedan slutet av 1980-talet ett nationellt referensomrade for Egentliga Ostersjon. Har bedrivs arligen en omfattande och integrerad kustfiskovervakning i syfte a ...

Kustomradet vid Holmon i Vasterbotten ar sedan slutet av 1980-talet ett nationellt referensomrade for Bottenviken. Har bedrivs arligen en omfattande och integrerad kustfiskovervakning i syfte att k ...

Torhamnsfjarden i Blekinge skargard ar sedan 2002 ett nationellt referensomrade for Sodra Ostersjon. Har bedrivs arligen en omfattande och integrerad kustfiskovervakning i syfte att kartlagga fiskb ...

Den integrerade kustfiskovervakningen i Fjallbacka har pagatt under oktobermanad sedan ar 1989 och under augusti sedan 1998 (med uppehall 1999). Overvakningen visar foljande tillstand och forandrin ...

Approximately 44 000–310 000 juveniles of the critically endangered European eel (glass eel) pass through filters annually at the cooling water intake of the Ringhals nuclear power plant in Sweden. This article attempts to quantify the mortality of glass eel during this process. Glass eel was captured before and after passage and stored in aquariums. Mortality rates were recorded and compared. Results showed that 13.4% of the glass eel passing the Ringhals plant died as a result of mechanical stress, temperature changes, or pressure changes during the passage. However, due to difficulties and shortcomings in field sampling and experimental design, these results should be treated with care and additional studies are needed.

The purpose of this report is to present a review and an evaluation of thestrategy of integrated fish monitoring included in the Swedish national marinemonitoring programme. As a background to the ...

Pregnant eelpout were collected for several years at German and Swedish Baltic coastal stations with different impact of pollutants and the prevalence of fry abnormalities compared between sites. Mortality of apparently normal developed larvae was observed with high variability in both German and Swedish sites. Malformation of larvae was a prominent disorder at all German stations with a prevalence ranging from about 50% up to a maximum of 90% in almost all analysed samples. At the Swedish stations malformation rates were significantly lower (range: 0–6%). Growth retardation of fry was clearly more prominent in eelpout from German coastal waters as well. Taken together the field data suggests that impaired larval development was associated with the state of environmental pollution at the sampling locations.

The first attempts to monitor coastal fish in Sweden were made in the 1960s and 1970s. Ecological, physiological, biochemical and environmental chemistry data were collected in separate projects. When the National Marine Monitoring Programme was revised in 1992, a new strategy was introduced for assessments of long-term trends in coastal fish communities. Annual integrated monitoring of contaminants, biomarkers and population and community indicators of ecosystem health was started in selected areas using common sentinel species. Data from one monitoring area at the coast of the Baltic proper are analyzed in this paper. The results have shown a shift in fish community structure indicating changes in ecosystem productivity. Trends have been detected in growth rate (positive) and relative gonad size (negative) in perch (Perca fluviatilis), suggesting a metabolic disturbance according to the predictive response model developed for interpretations. One factor which may have contributed to the reduced GSI was a decrease in mean age of sampled fish during the period of study. Chemical exposure was indicated by a 3-fold increase of EROD activity during the monitored 15-year period. However, concentrations of most measured contaminants in perch have decreased during the same period. The experience of the integrated approach has shown that a tentative analysis of cause and environmental significance could be made, improving the assessment, but there still remain unsolved questions to be answered in follow-up studies. The analysis has also shown the importance of long-term monitoring at several levels of biological organization to distinguish between natural variation and low-level effects on ecosystems.