Wimmera River Fish Report Vital Stats and Surprising Finds
Native Fish Report Card 2023: Wimmera River
Download: Native Fish Report Card- Wimmera River 2023 PDF 7.0MB DOCX 7.0MB
Overview
The 2023 Native Fish Report Card for the Wimmera River provides an insightful look into the health and diversity of fish populations within this vital waterway. This report highlights the findings from surveys conducted by Arthur Rylah Institute (ARI) and outlines the current status of both native and exotic fish species in the river.
Key Findings
- Target Species: The primary focus of the surveys was on Golden Perch (Macquaria ambigua) and Freshwater Catfish (Tandanus tandanus), both of which are translocated populations in the Wimmera River.
- Electrofishing Sites: Surveys were conducted at eight sites along the river, from Gross Bridge at Drung Drung to just upstream of Lake Hindmarsh, Jeparit.
Fish Species Recorded
– Large-bodied Native Species
- Golden Perch: Recent recruitment, multiple size classes, and mature fish were present.
- Freshwater Catfish: Low abundances made it difficult to determine key health indicators.
– Small-bodied Native Species
- Australian Smelt
- Common Galaxias
- Carp Gudgeon
- Flatheaded Gudgeon
– Exotic Species
- Common Carp
- Eastern Gambusia
- Goldfish
- Redfin
- Roach
Environmental and Management Context
The Wimmera River has experienced low flow conditions over the past seven sampling seasons. Rehabilitation efforts are ongoing to improve the river’s health and fish community, guided by the 2022 Wimmera Native Fish Management Plan. This plan aims to enhance the environmental, cultural, and socio-economic values of the region’s waterways.
Rehabilitation Actions
- Water Quality Improvement: Efforts to manage erosion, sedimentation, and water quality.
- Habitat Enhancement: Riparian habitat improvements through revegetation, weed control, and fencing.
- Fish Habitat Installation: Creating better environments for fish to thrive.
- Fish Stocking: Regular stocking of species like Golden Perch and Silver Perch to boost populations.
Monitoring and Results
- Golden Perch: The highest abundances were recorded in 2023, with a significant increase in stocking numbers over recent years.
- Freshwater Catfish: Despite low numbers, a mix of recruits, juveniles, and adults were recorded, providing essential data for management.
Conclusion
The Native Fish Report Card 2023 for the Wimmera River underscores the importance of ongoing monitoring and rehabilitation efforts. By understanding the dynamics of fish populations and implementing strategic management plans, the health of the Wimmera River and its native fish communities can be preserved and enhanced for future generations.
