Eurasian Otters: Freshwater or Seaside Hunters?

The Eurasian otter (a protected species in Bulgaria) is navigating a complex landscape of pollution and human activity. Recent research reveals that these adaptable creatures thrive in both rivers and along the Black Sea coast, consuming fish from either environment. This dual‑diet flexibility is pivotal for crafting effective conservation strategies.

Key Findings

• Mixed Diet: Otters feed on freshwater fish and marine species, switching habitats based on food availability.
• Habitat Interdependence: Protecting only rivers or only the sea is insufficient; both ecosystems must be safeguarded.
• Human Impact: Coastal development—ports, tourism—and rising sea levels threaten otter food sources by altering fish populations.

Conservation Recommendations

1. River Clean‑up: Reduce pollution to maintain healthy freshwater fish stocks.
2. Coastal Regulation: Control development and monitor marine habitats to preserve marine prey.
3. Integrated Management: Implement a dual‑focus approach that simultaneously addresses river and sea health.

Broader Implications

Studying the otter’s diet provides a window into ecosystem vitality. Declines in otter food availability may signal larger environmental problems requiring urgent action.