Fish stocks in the Baltic Sea: Finite or infinite resource?

Citation
E. Ojaveer et H. Lehtonen, Fish stocks in the Baltic Sea: Finite or infinite resource?, AMBIO, 30(4-5), 2001, pp. 217-221
Citations number
42
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology,"Environmental Engineering & Energy
Journal title
AMBIO
ISSN journal
0044-7447 → ACNP
Volume
30
Issue
4-5
Year of publication
2001
Pages
217 - 221
Database
ISI
SICI code
0044-7447(200108)30:4-5<217:FSITBS>2.0.ZU;2-K
Abstract
Human-induced environmental changes, especially eutrophication, and fluctua tions of natural environmental conditions under the changes in climate and solar activity affect the reproduction and growth of various fish species a nd communities in the Baltic Sea. The importance of human impacts has incre ased considerably during the last decades, overshadowing in many cases natu ral factors. High exploitation rates have depressed some valuable fish spec ies and affected the species dominance hierarchy. Oxygen depletion in deepe r layers progressively deteriorates the living conditions of certain marine species. Mass immigration of nonindigenous species with ballast waters can seriously affect ecosystems and fish stocks. The summary effect of these v ariables upon marine, relict and freshwater species can yield unexpected re sults. Fish resources should be properly assessed and managed by their natu ral units (populations). Based on cyclic fluctuations of global climatic pr ocesses, composition of long-term forecasts on changes in the structure and abundance of fish fauna should be started.