IEP Newsletter

The IEP Newsletter is a triannual publication that provides IEP program and science highlights as well as in-depth articles on scientific topics for resource managers, scientists, and the public.

IEP Newsletters are usually shorter articles intended for rapid communication. Articles in the IEP newsletter do not undergo external peer review. All primary research results should be interpreted with caution.

Upcoming Issues

Volume 44, Issue 2 (2025):

Call for Articles is open! Submission deadline is June 15, 2025.
Send article submissions to iep@wildlife.ca.gov.

Volume 44, Issue 1 (2025):

Currently in production.

Most Recent Publications

Volume 42, Issue 3, 2023 (PDF)

IEP Newsletter Archive

Volumes prior to 2021 are not available on the website. Visit the IEP Publication Library for a list of prior IEP Newsletters.

Request a Prior Newsletter Article

2021 IEP Newsletters

The Winter Volume 40, Issue 1 Supplemental, 2021 (PDF) includes the following articles:

Zooplankton Trends in the Upper SFE, 1974-2018
Mysid and Amphipod Length-Weight Relationships in the San Francisco Estuary
2018 Delta Juvenile Fish Monitoring Program Resident Fishes Status and Trends
An Online Seasonal Monitoring Report for Major Interagency Ecological Program Surveys
2020 Spring Kodiak Trawl Summary
2020 Smelt Larva Survey Summary
Discrete Water Quality Monitoring, 2018
Benthic Monitoring, 2019
2018 and 2019 20-mm Survey

The Spring Volume 40, Issue 2, 2021 (PDF) includes the following articles:

IEP in 2021: Implementing Change
Dr. Larry Brown: A Remembrance
The Pilot Long-Term Monitoring Review
Nearshore Fishes Annual Report
Salmonid Annual Report
Yolo Bypass Fisheries Annual Report
2019 Phytoplankton Annual Report
A Note From the Editor

The Summer/Fall Volume 40, Issue 3, 2021 (PDF) contains the following articles:

2021 20-mm Survey Summary
2021 Smelt Larva Survey Summary
2021 Spring Kodiak Trawl Summary
Fish Salvage at the State Water Project's and Central Valley Project's Fish Facilities during the 2019 Water Year
Fish Salvage at the State Water Project's and Central Valley Project's Fish Facilities during the 2020 Water Year
Liberty Island Beach Seine Sampling, 2002-2004 & 2009-2019
2017-2018 Yolo Bypass Fisheries Monitoring Status and Trends Report
2020 Status and Trends Report for Pelagic Fishes in the San Francisco Estuary

2022 IEP Newsletters

The Winter Volume 41, Issue 1, 2022 was not produced. No submissions were received.

The Spring Volume 41, Issue 2, 2022 (PDF) includes the following articles:

Of Interest to Managers
Feasibility of formalin-fixed Delta Smelt for genetic identification test
2021 Delta Juvenile Fish Monitoring Program Nearshore Fishes Annual Report
2020 and 2021 Delta Juvenile Fish Monitoring Program Salmonid Annual Report
2019-2020 Yolo Bypass Fisheries Monitoring Status and Trends Report
Fish Salvage at the State Water Project's and Central Valley Project's Fish Facilities during the 2021 Water Year
2021 Status and Trends Report for Pelagic Index Fishes in the San Francisco Estuary

The Summer/Fall Volume 41, Issue 3, 2022 (PDF) includes the following articles:

Of Interest to Managers
Research Article: From Spawning Grounds to the Sea: Development of a California Central Valley Fish Tracking System
Data Report: 2022 Spring Kodiak Trawl Summary
Data Report 2022 20-mm Survey Summary
Data Report: 2022 Smelt Larva Survey Summary

2023 IEP Newsletters

Volume 42, Issue 1 (Winter), 2023, is currently in production.

Volume 42, Issue 2 (Spring), 2023 was not produced. Spring Status and Trends articles are included in issue 3.

Volume 42, Issue 3 (Summer/Fall) 2023 (PDF), includes the following articles:

Of Interest to Managers
Data Report: 2022 Status and Trends Report for Pelagic Fishes in the Upper San Francisco Estuary
Data Article: 2023 Smelt Larva Survey Summary

2024 IEP Newsletters

Volume 43, Issue 1 (Winter), 2024 is in production.

Volume 43, Issue 2 (Spring), 2024 is in production.

Volume 43, Issue 3 (Summer/Fall), 2024 was not produced.