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What is the best way to keep herons from eating my fish? | Ponds & Lakes Q&A

Q: What is the best way to keep herons from eating my fish?

Q: What is the best way to keep herons from eating my fish?

Jim – Milford, MI

A: Herons are beautiful birds – but they see your fish as their own personal sushi bar. Because they’re intelligent creatures, you’ll need to get creative when it comes to keeping them at bay. Before we dive into scare-away strategies, let’s learn more about them.

IDing a Great Blue Heron

Great Blue Herons’ range covers the entire North American continent. They’re partial migrants; they summer in the upper Midwest and Canada, winter in Mexico and hang out all over the rest of the United States all year long.

Sporting blue-gray plumage with a black stripe over their eyes and a thick dagger-like beak – not to mention a 6-foot wing span and 4-foot-long body – these guys are easy to spot. They stand like statues or walk slowly on long legs as they stalk fish and other prey in freshwater ponds, saltwater wetlands, estuaries, grasslands and fields.

In the air, these big birds fly with slow wing beats, reaching 30 miles per hour and at an altitude of 80 to 90 feet as they scan the land below for reflections in fish ponds. When they find one that looks appetizing, they’ll quietly cruise in and wade like feathered ninjas, waiting for their next meal to hop, walk or swim by. They’ll eat anything within striking distance, from fish and amphibians to reptiles, small mammals, insects and even other birds.

Herons prefer hunting, foraging and dining alone. In fact, they’ll fiercely defend their territory, putting on dramatic displays of dominance should a competitor fly in. They’ll throw their heads back, point their bill skyward and outstretch their wings, chasing the other bird (or human!) away.

Protecting Your Fish

Because of the herons ninja-like skills, you might not know right away if one has been nabbing your fish – especially if you have a larger pond. If your fish were used to being fed in particular spot and tended to hang out around the edge but suddenly stay away or loiter at the bottom, that’s a sign that something’s amiss.

So how can you discourage the birds from seeing your pond as their dinner table? Here are some tricks to try:

  • Use a heron decoy. A decoy like the Pond Logic® Blue Heron Decoy, in your pond. Herons are territorial, and so if they see that another heron has claimed the pond, they’ll keep flying by. Pro tip: Avoid using heron decoys during mating season, which is generally April and May but may vary depending on your location. The decoy may actually attract birds looking for a mate …
  • Create obstacles around the pond. Herons land around the perimeter of a pond and walk up to the water. Obstacles, like clear fishing line strung around the pond perimeter make access difficult by creating an impassable barrier that they would need to step over. Don’t worry: It won’t obscure your view of the pond.
  • Startle them with water. For ponds smaller than 1200 sq. ft. a motion-activated sprayer, like the Contech ScareCrow®, detects movement up to 40 feet away and spritzes the predator with water. It’s designed to startle them and scare them away.
  • Provide hiding places for your fish. Just in case a heron does find its way into your pond, give your fish a place to hide. Portions of submerged large-diameter pipe or beds of weeds work well, as does the addition or other fish habitat.

Experts recommend using a variety of methods to chase away these hungry birds because they will eventually figure out the decoy, obstacles and sprays of water are harmless. But be vigilant! Your fish will appreciate the effort!

Pond Talk: How do you scare away heron from your pond or lake?

Protect Your Fish From Predators - Pond Logic® Blue Heron Decoy

How Do I Deter Herons From My Water Feature? – Water Feature Q & A

Picture of a heron catching a koi

Water Feature Q & A

Q: I have a hungry heron visiting my pond. What can I do besides a net? P.S. Is it legal to shoot a heron in the state of Virginia? – Earl of Virginia

A: A fish lovers nightmare…the heron! Ever wake up in the morning, walk out to your water feature with a cup of coffee (or orange juice for you non-coffee drinkers) and discover a heron eating one of your precious koi (see left)? Your heart begins to race and your not sure what to do, you grab the nearest broom and charge out to the heron like there’s no tomorrow! Are you tired of this? Well here are a couple of options for deterring and protecting your fish.

The Motion Activated Scarecrow: This motion-sensored sprinkler is a great way to deter not only herons but other predators as well. The sprinkler simply hooks up to a garden hose and is triggered by motion. There is a dial on the sprinkler that adjusts the sensitivity. When a heron/predator approaches sensor, it shoots a 3-second burst of water up to 180 degrees.

Pros: Extremely effective throughout the season. Can be easy blended into your water feature.

Cons: The Scarecrow doesn’t know the difference between a heron and a person so be prepared to dodge the spray!

Great Blue Heron Decoy:
Herons are very territory birds. When flying over head, if a heron sees another heron they will deter and go elsewhere. This life-like decoy, when placed next to your water feature, will do just that. We highly recommend to move them every couple of days. This will help prevent the heron from figuring out the decoy.

Pros: Effective when moved around. Adds a nice touch of nature to any water feature.

Cons: Cannot be placed outside during mating season (March-May) for obvious reasons. Once a heron has already established your water feature as its territory it becomes harder for the decoy to be effective.

Can you shoot a heron?:
Although they can be a pest, Great Blue Herons are protected under federal law. It is illegal to shoot them in the US.

Protecting Your Fish From Predators – Water Garden Q & A

Picture of Great Blue Heron

Q: Last year something caused over 20 of my fish to disappear overnight. How can I protect my fish?
-Katherine of Nanty Glo, PA

A: More often than not, what took your fish was a blue heron. We hear this quite a bit throughout the year. Here are a couple suggestions:

Blue Heron Decoy: These decoys, when used correctly, will deter blue herons away from your water garden. Here’s why: Blue herons are very territorial birds. If a heron sees another heron by a prospecting water garden, it will rather fly to another destination than challenge the heron thats there. By using a Blue Heron Decoy, you can accomplish just that. It is recommended to move the heron decoy every other day. Caution: DO NOT use heron decoys during mating season as they will become a heron magnet instead.

Motion Activated Scarecrow Sprinkler: This motion activated sprinkler works extremely well to deter any predator (including kids =) ). Simply hook to your garden hose, set the sensitivity level and any predator that comes within a 20 foot range will get hit with a 3 second burst of water. It works great and it is guaranteed effective.

Aquatic Plants: Having a 50-60% coverage in plants will help create a hiding spot for fish when predators are around.

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