FishSens Magazine

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Should I Stay or Go?🐟California steelhead don't think of the popular rock song when they choose whether or not to migrat...
06/09/2026

Should I Stay or Go?

🐟California steelhead don't think of the popular rock song when they choose whether or not to migrate to the ocean. In fact, they don't choose at all.

Research shows that, to a large extent, their genes determine whether this popular sport fish migrates or stays in freshwater.

Emerging evidence from UC Santa Cruz suggests that populations with both genotypes are likely to be more resilient to ecosystem change, with implications for steelhead conservation.

Learn more about this research ➡️ https://www.fishsens.com/should-i-stay-or-go-genetics-explain-why-some-california-steelhead-avoid-the-ocean/

Photo Credit: Georgia Third, Eric Palkovacs & Lobsang Wangdu



UC Santa Cruz Science
NOAA Fisheries West Coast
The Nature Conservancy in California

🐋New Zealand experiences the highest rate of marine mammal strandings in the world, but it also has the highest rescue s...
06/08/2026

🐋New Zealand experiences the highest rate of marine mammal strandings in the world, but it also has the highest rescue success rate. Unfortunately, whale strandings are a common occurrence.

However, advances in technology are offering new insights into whale vocalizations and the search for what could be signature whistles. Deep learning, coupled with AI analysis, means detection can happen faster and more reliably than otherwise.

In December 2025, a local team deployed a NexSens CB-450 buoy in Golden Bay, New Zealand, to listen for whale signals and improve rescue efforts.

Learn more about the system working to save stranded whales ➡️ https://www.fondriest.com/news/ai-buoys-could-help-predict-whale-strandings-in-new-zealand.htm

Photo Credit: Adapted from Project Jonah.

Lake heatwaves are becoming more frequent, longer-lasting, and potentially more damaging than atmospheric heatwaves. 🌍🌡️...
05/20/2026

Lake heatwaves are becoming more frequent, longer-lasting, and potentially more damaging than atmospheric heatwaves. 🌍🌡️

A 2025 study found that lakes worldwide are retaining heat longer due to water’s high specific heat capacity, creating prolonged thermal stress for aquatic organisms. Researchers analyzed 265 lakes worldwide and found that 71% showed rising heatwave frequency, while recurrence intervals dropped dramatically.

As global temperatures continue rising, high-latitude and shallow lakes may face some of the greatest risks in the decades ahead.

Learn more ➡️ https://chatgpt.com/c/6a034e59-d00c-83ea-b5da-31e9bf7fcffb

Photo Credit: Adapted from Courtney RA via Pexels

When the water rose on the new Paintsville Lake reservoir in Eastern Kentucky, swaths of forest were submerged. The wood...
05/19/2026

When the water rose on the new Paintsville Lake reservoir in Eastern Kentucky, swaths of forest were submerged.

The woody structures provided an ideal habitat for what soon became prized trophy fish. But in the decades since dam construction, this habitat has deteriorated.

The Kentucky Department of Fish and Wildlife knew it had to step in and devised a collaborative plan to improve Paintsville Lake.

Learn more about the project ➡️ https://www.fishsens.com/paintsville-lake-habitat-improvement-initiative/

Photo Credit: Adapted from Jason Russell / Kentucky Fish and Wildlife.



Kentucky Department of Fish and Wildlife Resources; National Fish Habitat Partnership; Bass Pro Shops; U.S. Army Corps of Engineers Great Lakes and Ohio River Division; Eternal Reefs

Zebra mussels are a widespread invasive species in the Midwest and Mississippi River Basin, but struggled for decades t...
05/13/2026

Zebra mussels are a widespread invasive species in the Midwest and Mississippi River Basin, but struggled for decades to spread past the Great Plains.

However, they have slowly infiltrated Texas, so predicting where and how they will spread is important for natural resource management.

A 2025 study in Biological Conservation used a habitat suitability index and network analysis to estimate zebra mussel spread in Texas.

Learn more about the study ➡️ https://www.lakescientist.com/research-brief-identifying-texas-lakes-critical-to-zebra-mussel-spread/

Photo Credit: Adapted from D. Jude, Univ. of Michigan via Flickr.

In 1854, the government sent surveyors to the wild border between the Washington and Oregon territories. They came acros...
05/11/2026

In 1854, the government sent surveyors to the wild border between the Washington and Oregon territories. They came across the East Fork Lewis River, a lush, green forested wetland with a calm river that braided widely across the landscape.

However, decades of development and gravel mining on its shores straightened the river, causing bank erosion and cutting off access to salmon habitat.

Now, nearly 200 years after the river was first mapped, a $23.5 million project aims to reconnect and restore a stretch of the East Fork Lewis River to its former self.

Learn more about the restoration work ➡️ https://www.fondriest.com/news/reconnecting-a-columbia-river-tributary-is-restoring-salmon-and-water-quality.htm

Photo Credit: Adapted from the Lower Columbia Estuary Partnership.

Reefs are a crucial habitat for aquatic life worldwide. But they're not always made of coral. 🪸Freshwater organisms may ...
05/05/2026

Reefs are a crucial habitat for aquatic life worldwide. But they're not always made of coral. 🪸

Freshwater organisms may use rocky reefs to lay eggs and hide from predators. Decades ago, in Saginaw Bay, on Lake Huron, this natural habitat was smothered in sediment from human industry.

Now, a collaborative effort is restoring rocky reefs to the crucial fishery, in hopes of boosting walleye and whitefish populations that were once pushed to the brink. 🐟🪨

Learn more about the restoration work ➡️ https://www.fishsens.com/rocky-reefs-to-the-rescue-creating-new-walleye-habitat-in-saginaw-bay/

Photo Credit: Adapted from Zak Allan and Inspired Planet



Michigan Department of Natural Resources; NOAA Fisheries Service; Great Lakes Fishery Commission ; Michigan Department of Environment, Great Lakes, and Energy ; Environmental Consulting & Technology, Inc.; Michigan Sea Grant

Meandering between California's towering coastal redwoods are streams crucial for salmon spawning.However, human pressur...
05/04/2026

Meandering between California's towering coastal redwoods are streams crucial for salmon spawning.

However, human pressures often hinder upstream migrations. Such is the case in Cooper Mill Creek, a small but important spawning ground that was impeded by human infrastructure for decades.

However, a recent fish passage and habitat improvement project has changed Cooper Mill. These projects aren’t guaranteed success, so scientists are monitoring to ensure it remains suitable for these keystone species.

Learn more about salmon restoration in California ➡️ https://www.fondriest.com/news/restoring-a-california-creek-enhances-salmonid-habitat-in-redwood-forests.htm

Photo Credit: Adapted from Pacific Watershed Associates, Inc.

In 2018, Hurricane Michael decimated the Chipola River–the only river in Florida with a reproducing population of shoal ...
04/28/2026

In 2018, Hurricane Michael decimated the Chipola River–the only river in Florida with a reproducing population of shoal bass.

The Florida Fish and Wildlife Conservation Commission raced to save this unique species and preserve “potentially the genetically purest, intact population of the species."

Learn how, even seven years later, biologists are helping shoal bass ➡️ https://www.fishsens.com/bringing-floridas-shoal-bass-back-from-the-brink/



MyFWC Florida Fish and Wildlife

One of the most biodiverse rivers in the entire Midwest flows through central Ohio. Surrounded by suburban sprawl and ag...
04/27/2026

One of the most biodiverse rivers in the entire Midwest flows through central Ohio.

Surrounded by suburban sprawl and agriculture, conservation groups like The Nature Conservancy have long focused on the Big Darby Creek.

TNC recently finished a multi-year restoration project at the Darby's headwaters, aiming to improve water quality throughout the entire waterway.

Learn more about this project and what the future holds for Big Darby Creek ➡️ https://news.fondriest.com/restoring-the-headwaters-of-ohios-most-biodiverse-river-the-big-darby-creek.htm

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