- ID: 16783
- State: Finalized
- Owner: Charles Lee
- Spatial Design Category: Census: Full
- Sites in Design: 2
- Has Location Privacy: No
- Data Repository: PTAGIS Website (See Sample Design Overview for full list)
A multiple pass mark-recapture study is conducted to estimate abundance of Redband Trout in an index area of the Spokane River. Redband Trout are captured by electrofishing using a drift boat mounted with a Smith-Root 2.5 GPP electrofishing unit. A crew of 2-3 individuals, one rower and 1-2 netters, conduct the electrofishing surveys. A total of three sampling passes are conducted during the survey. A sampling pass, or capture-recapture occasion, consists of sampling each shoreline of the sampling area. Electrofishing transects were established prior to the initial capture effort using a recreational grade handheld GPS. Two float trips are required to sample both shorelines during each pass. The initial sampling float starts on either the north or south shoreline and alternates to the opposite shoreline at intervals of approximately 600 seconds (500 m). The subsequent float begins on the opposite shoreline and alternates to the shoreline segments that were not sample on the previous float, ensuring that the entire shoreline iss sampled. This strategy is employed to avoid electrofishing over recently released Redband Trout. All float trips commence at least 0.5 hours after sunset and continue until all transects for that float are complete.
Area of Inference
Map of Sites
WorkStatementElements Referencing This Design
- 1997-004-00, 84042 REL 27, Work Element B: 157 - Conduct abundance estimate of Redband Trout in the Spokane River.