Climate change impacts on fish in the Baltic Sea

Area of Science:

• Marine Biology
• Ecology
• Climate Science

Background:

• The Baltic Sea features significant abiotic gradients, supporting fish from both marine and freshwater environments.
• Understanding climate change impacts on these fish populations is crucial for ecosystem management.

Purpose of the Study:

• To review empirical evidence on how climate variables affect fish and fish communities in the Baltic Sea.
• To synthesize findings on species-specific and community-level responses to climate change.

Main Methods:

• Literature review focusing on studies examining responses to temperature, salinity, and hypoxia.
• Analysis of evidence for impacts on fish reproduction, feeding, growth, and population dynamics.

Main Results:

• Negative impacts on reproduction and feeding areas are evident for demersal fish of marine origin.
• Warmer waters benefit reproduction and growth in some smaller pelagic and coastal freshwater fish species.
• Climate change impacts are often mediated by alterations in prey availability and quality.
• Evidence suggests fish are adapting to climate change, partially mitigating negative effects.

Conclusions:

• Climate change poses significant threats to Baltic Sea fish communities, with varied impacts across species.
• Adaptation potential exists, but a precautionary management approach is vital to mitigate adverse effects.
• Future climate change impacts are projected to intensify, necessitating proactive conservation strategies.