Science activity
Science activity #49868, updated 29 April 2022

An Evaluation of Sublethal and Latent Pyrethroid Toxicity Across a Salinity Gradient in Two Delta Fish Species

Description / purpose

Pyrethroids are a type of insecticide frequently detected in the San Francisco Bay and Delta (SFBD). They are highly toxic to fishes and may contribute to their decline. The Central Valley Water Resources Control Board has adopted regulations for many pyrethroids. These concentration goals for Delta surface waters are quite stringent. However, they do not take into account non-lethal effects in fishes, particularly during the early life stages and at the salinity conditions we see in the SFBD. Understanding non-lethal effects in fish is vital to influencing population health. This study investigates pyrethroid toxicity on Delta smelt and Inland Silverside embryos, while accounting for changing SFBD salinity and other factors such as sediment. Results will inform the development of pesticide regulation criteria and control efforts, furthering the protection of SFBD fishes.

Linked science activities

None specified


Susanne Brander, Principal investigator - Oregon State University

Activity status

  • Awarded / Initiating (2019)
  • In progress / Ongoing (2019 - 2021)
  • Complete

Funding summary

Total allocated funding: $494,663

Label Value
Contract # or labor code 18206
Implementing organization Oregon State University
Funding organization Delta Stewardship Council
Funding Source Not provided
Date of award 2019-08-01
Date of fiscal year-end Not provided
Total award amount $494,663
State type of obligation Not provided
Federal type of obligation Not provided
Reimbursability Not provided
Procurement mechanism Contracted competitive or direct award
Annual Expenditures

2019 - $289594.00 ()

2020 - $205068.00 ()


Delta regions

Geographic tags

None specified

Products and outputs

Type Title Description Views
Link An Evaluation of Sublethal and Latent Pyrethroid Toxicity Across a Salinity Gradient in Two Delta Fish Species screenshot of a web-based summary of the project 0

Type and context

Science action area
Management themes
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Management actions
None specified
Science Topics
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Lead implementing organization
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None specified