Happy Monday Spacefish!

I wish I were bringing you more joyful news, but…Florida has found itself in the throes of a true winter gut punch. A prolonged polar vortex has pushed cold air deep into the peninsula, dropping water temperatures across rivers, lagoons, canals, and backwaters. For Florida’s tropical and subtropical fish species, especially snook, this kind of cold can be devastating.

Anglers around the state have already begun reporting dead and cold-stunned fish, with videos and photos circulating online showing snook, tarpon, jacks, and other species floating or pinned against shorelines. While the full scope of the damage is still unfolding, early signs suggest this cold event could rival some of the most impactful freezes Florida has seen since 2010.

Why cold kills snook (and other tropical fish)

Snook are particularly vulnerable to cold. As a subtropical species, they begin experiencing stress when water temperatures drop below about 50°F. Prolonged exposure can lead to cold shock, disrupting normal behavior and bodily functions.

According to FWRI biologist and snook expert Alexis Trotter, the effects of cold aren’t always immediate.

“The first sign of distress for snook is usually a disruption of feeding behavior—they stop eating,” Trotter explained. “If conditions don’t improve, equilibrium issues follow.”

In other words, fish may look alive and recoverable at first, only to succumb days, or even weeks later. Cold can also damage the protective slime coating on fish, leaving them vulnerable to infection and disease long after temperatures rebound.

This freeze is especially concerning because of its scope. Unlike typical cold snaps that mainly impact northern range-edge areas, this event has blanketed nearly the entire state, limiting the availability of warm-water refuge even in places fish usually escape to.

What has been seen on the water

As of early reports, fish kills have been scattered but widespread. Initial hotline reports included tarpon on Florida’s east coast, while southwest Florida beaches have seen concentrations of dead crevalle jacks. Snook, tarpon, jacks, and goliath grouper are all species FWRI biologists are watching closely, especially those trapped in canals and backwater systems.

Fish are often found stacked in corners, near structure, or drifting along shorelines, tell-tale signs of a cold-weather fish kill.

It’s also important to remember that not all affected fish float immediately. Many will die after the cold passes, meaning reports could increase over the coming days and weeks.

How severe is this event?

At this time, the Florida Fish and Wildlife Conservation Commission (FWC) has not released official mortality estimates. However, past freezes—most notably in 2010—caused major population declines and resulted in multi-year harvest closures for snook.

Loss of adult snook is especially troubling. Larger fish are critical spawners, and their absence can slow population recovery for years.

What anglers can do right now

Recreational anglers play a crucial role in helping fisheries managers understand and respond to cold-kill events. Here’s how you can help:

1. Be thoughtful about what you target
Avoid targeting cold-stressed snook and other vulnerable species. Even if you find fish stacked in warm pockets, remember they may still be fighting off cold stress.

2. Handle fish with extra care
If you do hook a stressed fish:
– Keep it in the water whenever possible
– Wet your hands, gloves, or towel before touching it
– Minimize air exposure to protect the slime coat

3. Report fish kills—accurately
The FWC operates a fish kill hotline and reporting system at 1-800-636-0511. When reporting, try to standardize your observations:
Instead of estimating thousands of fish, count what you see in roughly a 50-foot stretch, broken down by species. Then report that number along with the estimated total affected area.

For example:

“Observed 4 snook, 17 crevalle jacks, and 1 goliath grouper in a 50-foot section of a roughly 300-yard stretch.”

Clear, consistent reports help biologists far more than emotional estimates—and anglers truly become the eyes on the water.

4. Leave dead fish in the water
Despite rumors that sometimes circulate during freezes, it is still illegal to possess snook outside of regulations. Any change to that would require an executive order, which has not occurred. Count and report fish, but don’t remove them.

What comes next

Cold weather remains one of the greatest natural threats to Florida’s snook fishery. History shows that snook can rebound—but recovery takes time, favorable conditions, closed harvest, and responsible fishing pressure. As assessments continue, anglers across Florida will be watching closely.

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