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Assessment Of Hardhead Population In Lower Willow Creek: A Study For The Crane Valley Hydroelectric Project.pdf

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Summary

# Assessment of Hardhead Population in Lower Willow Creek - Executive Summary

## Background
This study was conducted at the request of Pacific Gas and Electric Company (PG&E) for the Crane Valley Hydroelectric Project's FERC relicensing process. It aimed to evaluate the hardhead (Mylopharodon conocephalus) population in lower Willow Creek, a sensitive species protected by both state and federal agencies.

## Objectives
The primary goals were:
1. To analyze biological and physical habitat conditions affecting native fish in lower Willow Creek.
2. To assess the current status of hardhead populations.
3. To provide initial data for management plans to enhance hardhead numbers.

## Methodology
Field sampling was performed on October 3-4, 2000, at four sites along lower Willow Creek. Various fish species were collected and analyzed.

## Key Findings:
- Hardhead Absence: Hardhead were not found at any of the sampled sites, confirming their rarity in this tributary of the San Joaquin River.
- Sacramento Pikeminnow Dominance: Sacramento pikeminnow (Pimephales promelas) comprised 92.1% of the total fish collected from lower Willow Creek stations, indicating its importance as a spawning and rearing habitat.
- Green Sunfish Predation: An initial minimum flow of 0.5 cubic feet per second (cfs) is recommended to prevent green sunfish (Lepomis calcarifer) from preying on juvenile hardhead during low flow seasons. This strategy leverages the sunfish's predatory nature to control their population.

## Conclusion and Recommendations:
The study reveals a healthy Sacramento pikeminnow population in lower Willow Creek, suggesting that even without hardhead, the habitat is viable. Management recommendations focus on maintaining minimum flows to manage introduced species and support native fish communities.

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Assessment of hardhead fish population in lower Willow Creek, requested by Pacific Gas and Electric Company for FERC relicensing of the Crane Valley Project, focusing on current status and sensitivity of this USFS-listed and state-concerned species.

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File Format: PDF
File Size: 1.96 MB
Pages: 39
Language: EN
Total Downloads: 63
Last Updated: 3 days ago

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