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Sample Design: Harmful Algal Blooms in the Snake River
Basics

The details of this Sample Design, including all the parameters used to generate it, are included below. Sample designs must belong to a Study Plan.

Description

Primarily juvenile fall Chinook salmon mortalities will be collected at the Lower Granite Dam juvenile fish facility although some fish may be sacrificed to meet target sample sizes. Five fish will be collected each week from mid-August through the end of October for a total of 12 sampling weeks and a grand total of 60 (12 weeks x 5 fish/week) fish sampled. Fish will be weighed, measured, and have their livers removed. Livers will be frozen for later analysis of cyanotoxin presence and amount.

A total of 40 SPATT sampler will be deployed in Lower Granite Reservoir. Ten samplers will be deployed on each of 4 occasions: once each in August, September, October, and November. During each month, a sampling string of 5 SPATTs, spaced at various depth intervals, will be deployed in the forebay of Lower Granite Dam. The remaining 5 samplers samplers will be deployed near the water surface at Wawawai, Blyton, Nisqually, Silcott, and Lewiston within the reservoir.

A total of 3 mobile surveys will be conducted in the lower thrid of Lower Granite Reservoir during August, September, and October to map water quality parameters and algae distribution.

Start Year

2023

End Year

2024

Study Plan

Snake River Harmful Algal Blooms v2.0

Data Repositories

Photos

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Documents

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Area of Inference

Chinook Fall Interior Columbia Pop. Name: Snake River Lower Mainstem

AOI Notes

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Sample Sites
These are the unique sites that are participating in this sample design over the time period covered by the design.

Map of Sites

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Sampling Schedule
This section describes which sites are scheduled to be sampled in any given year, and (if applicable) the panel and stratum that the sample site belongs to.

Plan Description

Fish sampling will occur weekly (5 fish/week) from mid-August through the end of October at the Lower Granite Dam juvenile fish facility.

Cyanotoxin sampling using SPATT samplers will occur monthly from August through November at various locations in Lower Granite Reservoir.

Water quality and algae mapping will occur monthly from August through October in the lower third of Lower Granite Reservoir.


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