Olsson, Jens
- Department of Aquatic Resources (SLU Aqua), Swedish University of Agricultural Sciences
Abstract
Coastal predatory fish are of key importance for the provisioning of ecosystem services in the Baltic Sea. Worldwide, however, there has been a general and sharp decline in predatory fish populations, in turn threatening the viability and function of marine ecosystems. On the basis of the literature, the past (data until the 2000s) and current (data until early and mid 2010s) trends in abundance of coastal predatory fish in the Baltic Sea are reviewed in this paper. Potentially important impacting factors behind the temporal development of the populations and measures to strengthen and restore them are also discussed. Available data from coastal fish monitoring programs suggest a stable or increasing abundance of coastal predatory fish as a functional group and for the species perch in the majority of areas assessed in the Baltic Sea. For pike and pikeperch, data to support assessments is scarce, but suggest substantial declines in the abundance of both species in most assessed areas. The impacting factors behind these patterns vary between species and areas, but include climate, habitat exploitation, fishing, and species-interactions in the coastal food web. Measures to restore and support coastal predatory fish communities should follow an ecosystem-based approach to management and include efforts to regulate fisheries sectors in combination with habitat protection and restoration.
Keywords
status assessment; HELCOM; impacts; measures
Published in
Fishes
2019, volume: 4, number: 1, article number: 7
SLU Authors
Associated SLU-program
Coastal and sea areas
Global goals (SDG)
UKÄ Subject classification
Ecology
Publication identifier
- DOI: https://doi.org/10.3390/fishes4010007
Permanent link to this page (URI)
https://res.slu.se/id/publ/98601