If you're trying to figure out how to catch alewife, you're likely after some of the best live bait available for big-game freshwater and saltwater species. These silvery little fish are the primary fuel for massive lake trout, king salmon, and striped bass. If you've ever spent a morning watching your sonar screen fill up with bait clouds but couldn't get a single one into your bucket, you know it's not always as easy as it looks.
Alewives are high-energy, schooling fish that move in massive numbers, but they're also incredibly delicate. Catching them requires a mix of the right timing, the right gear, and a bit of patience. Whether you're standing on a pier at midnight or hovering over a deep-water school in a boat, here is the lowdown on how to get the job done without losing your mind.
Understanding the Alewife Run
Timing is arguably the most important factor when you're learning how to catch alewife. For most of the year, these fish stay out in deep, cold water where they're hard to reach without a massive commercial rig. However, during the spring and early summer, they move into the shallows and river mouths to spawn.
This move usually starts when water temperatures hit that sweet spot in the low 50s. You'll start seeing them school up near marinas, piers, and rocky shorelines. If you're fishing the Great Lakes, this usually happens between May and July. On the coast, the timing varies, but the behavior is the same. They want warmer water to drop their eggs, and that brings them right to your feet.
If you aren't fishing during a run, look for them at night. Alewives are notoriously light-sensitive. During the day, they might dive deep to avoid predators and bright sun, but as soon as the sun goes down, they rise to the surface to feed on plankton. This is when they become sitting ducks for a well-placed net.
The Most Effective Gear for the Job
You can't just throw a worm on a hook and expect to fill a bait well with alewives. They are filter feeders for the most part, so you have to use methods that play into their schooling nature or their curiosity.
Using a Cast Net
The cast net is the gold standard for anyone serious about how to catch alewife in large quantities. If you find a thick school, one good throw can land you fifty fish in a single go.
However, you need the right net. A standard bait net with 1/4-inch mesh is usually too small; it creates too much drag and sinks slowly, allowing the fast-moving alewives to swim right out from under it. On the flip side, if the mesh is too large, the fish will get "gilled," meaning they get stuck in the holes. This usually kills the fish or damages them so badly they won't last long in your tank. Aim for a 3/8-inch or 1/2-inch mesh net.
A 6-foot or 8-foot radius net is usually plenty. Just remember that throwing a heavy net for two hours is a workout, so don't go bigger than you can comfortably handle.
Sabiki Rigs for Deeper Water
If the alewives are holding in deeper water or in areas where you can't throw a net—like around thick dock pilings or from a high pier—a Sabiki rig is your best friend. These are pre-made rigs with a string of tiny, flashy hooks that look like microscopic shrimp or plankton.
When using a Sabiki, you don't need bait. You just drop the rig down into the school and give the rod tip small, rhythmic twitches. The alewives see the flash and strike out of instinct. It's common to pull up three or four at a time. It's a bit slower than a cast net, but it keeps the fish in better physical shape because they aren't being crushed under the weight of a net full of other fish.
Where to Target Them
You can have the best gear in the world, but if you're in the wrong spot, you're just practicing your casting. Alewives love structure and current, but they also love safety.
Marinas and Harbor Walls
Marinas are magnetizing for alewives. The concrete walls hold heat, and the docks provide a bit of cover from the wind. If you can find a marina with public access and plenty of lighting, you've hit the jackpot. Alewives are drawn to artificial light at night because it attracts the bugs and plankton they eat.
Spillways and Dams
During the spring spawn, alewives are driven to move upstream. They'll follow the current until they hit a barrier they can't cross, like a dam or a steep spillway. You'll often find them stacked up in the "wash" below these structures. If you can get a cast net into those eddies where the water slows down just a bit, you'll likely pull up a heavy load.
River Mouths
The transition zone where a river meets a lake or the ocean is prime real estate. Alewives will hover in these areas waiting for the right temperature spike before heading up-river. Look for "breaks" in the water color or temperature where the river water mixes with the main body of water.
Keeping Alewives Alive
Getting them into the boat is only half the battle. If you want to know how to catch alewife for bait, you have to know how to keep them from dying the second you touch them. These fish are incredibly fragile. They have very loose scales, and they are highly susceptible to "red nose," which is basically a stress-induced bruising that happens when they run into the walls of a tank.
First, use a circular bait tank. If you put alewives in a square cooler, they will swim into the corners, get stuck, and die. In a round tank, they can swim in a continuous circle, which keeps water flowing over their gills and prevents them from bumping into things.
Second, you need serious aeration. A simple "bubbler" usually won't cut it if you have more than a dozen fish. You need an oxygen infusion system or a high-volume recirculating pump. They also don't handle heat well, so if you're fishing in the summer, keep the water cool with a few frozen water bottles—just don't use loose ice, as the chlorine in city water can kill them.
Legal Considerations and Ethics
Before you head out, check your local regulations. In some states or provinces, catching alewife is strictly regulated. There might be limits on how many you can keep, or specific rules about which tributaries allow netting.
Also, be aware of invasive species laws. Alewives themselves are often considered invasive in certain Great Lakes regions, and moving them from one body of water to another is usually a massive legal "no-no." Always use the bait in the same water where you caught it to avoid spreading diseases or disrupting the local ecosystem.
Wrapping It Up
Learning how to catch alewife is one of those skills that takes a day to learn but a lifetime to master. It's messy, it's often done in the dark, and you'll probably end up covered in silver scales by the end of the night. But when you hook into a 30-pound king salmon that couldn't resist that fresh, flickering bait you caught yourself, all that effort pays off.
Just remember: watch the water temp, find the lights at night, and for heaven's sake, use a round tank. If you can get those three things right, you'll never have to rely on frozen bait again. Happy hunting, and hopefully, your next cast is a "pancake" that comes up heavy.