Selecting the right bait is crucial in fishing, and casters are a top choice for their effectiveness in attracting diverse fish species. These small but mighty baits, however, have a short shelf life, presenting a challenge for anglers with leftovers. Instead of discarding them, freezing casters is a practical solution that conserves their freshness for future outings.

This guide outlines a simple five-step process on how to freeze casters, ensuring they remain enticing to fish after thawing. By mastering this technique, anglers can save money, reduce waste, and maintain a ready supply of quality bait. Whether you’re a beginner or a seasoned fisher, learning to freeze casters is an essential skill that enhances your fishing experience.

What is a Caster?

A caster is not just any bait; it is the chrysalis stage of a bluebottle fly, a critical phase where the maggot transforms into a pupa before emerging as a fully-fledged fly. This transformation begins when the maggot, having gorged itself for weeks, encases itself in a thin, protective shell to facilitate its metamorphosis. Anglers treasure casters for their effectiveness in luring a variety of fish, particularly because they mimic a natural food source found in aquatic environments.

For the fisherman, the caster is a bait of convenience and potency. It’s small enough to be used on a hook but substantial enough to attract large fish. However, the caster’s window of use is narrow; once it transitions to a fly, it’s no longer useful as bait. Hence, the ability to freeze and store casters at this stage is a valuable skill, allowing anglers to extend the usability of their bait and ensure they have a ready supply whenever they head to the waterside.

Is Freezing Casters a Good Idea?

Freezing casters is a good idea because:

It Preserves Freshness

Casters, while effective, are perishable. They quickly lose their vitality and appeal to fish if not kept fresh. Freezing casters is the most efficient method to preserve their freshness, extending their life beyond the natural few days they would last at room temperature.

It’s Economically Efficient

Anglers who invest in casters are well-advised to freeze any unused bait. By doing so, they avoid the wasteful and costly practice of discarding bait after a single use. Freezing casters is a testament to resourcefulness, ensuring that every penny spent on these baits yields its maximum potential.

How Long Can You Keep Casters in the Freezer?

While freezing extends the life of casters, it’s not an indefinite solution. Typically, a month is the maximum recommended time to keep casters frozen. Beyond this period, they may suffer freezer burn or lose their texture, diminishing their effectiveness as bait.

Freeze your casters for up to 1 month

By understanding the need to freeze casters, anglers can make informed decisions about bait management. This practice not only saves money but also ensures that the bait’s quality is preserved, making every fishing trip as productive as possible.

How to Freeze Casters?

1- Sorting and Cleaning

  • Selection: Begin by separating the good casters from the bad. Discard any that float to the surface, as they are likely spoiled.
  • Rinsing: Thoroughly rinse the remaining casters in clean water to remove any impurities that could affect their quality during freezing.

2- Drying Process

  • Draining: Allow the casters to drain in a sieve or riddle to remove excess water, which can cause ice crystals to form during freezing.
  • Dabbing: Gently pat the casters dry with kitchen paper, taking care not to apply too much pressure and damage them.

3- Packaging

  • Bag Selection: Opt for sandwich bags, which are inexpensive and readily available, to store the casters.
  • Filling Bags: Portion the casters into bags, using about half a pint per bag, which is a suitable amount for an average fishing session.

4- Sealing and Storing

  • Air Removal: Squeeze out as much air as possible before sealing the bags to prevent freezer burn.
  • Freezing: Place the bags in the freezer, ensuring they lie flat and nothing heavy is placed on top to avoid squashing.

5- Thawing for Use

  • Preparation: Remove the casters from the freezer the night before fishing, or let them thaw naturally on your way to the fishing site.
  • Water Bath: If they’re not fully thawed upon arrival, a quick soak in a bait tub of water can expedite the process.

By following these steps, anglers can efficiently freeze casters, maintaining their quality and ensuring a successful bait for future fishing trips.

What is Better? Fresh or Frozen Casters

Texture and Quality

Fresh casters are the gold standard, prized for their firmness and resilience on the hook. They possess a robust texture that resists damage when pierced, making them ideal for anglers who need their bait to stay intact through multiple casts or in strong currents.

In contrast, frozen casters, once thawed, often soften, which can complicate the hooking process. This softness, however, does not necessarily diminish their effectiveness as bait.

Effectiveness as Bait

While fresh casters are unmatched in quality, frozen casters still hold significant value. They may not be the first choice for hook bait due to their softer texture, but they excel in ground bait or as loose feed. The freezing process does alter their texture, but it preserves the essential oils and scents that attract fish.

Economic and Practical Considerations

Economically, frozen casters make sense. They allow anglers to buy in bulk and preserve surplus bait that would otherwise go to waste. Practically, having a stock of frozen casters means always being prepared for an impromptu fishing trip without the need for a last-minute bait shop visit.

A ball of ground bait with frozen casters in it.
Frozen casters work well in ground bait

In summary, while fresh casters are superior in texture and ease of use, frozen casters are a viable alternative that can save money and reduce waste, proving especially useful for ground baiting and casual fishing endeavors.

What Fish Like Casters?

Versatility of Casters

Casters are a versatile bait, appealing to a wide range of fish species. Their natural origin as part of the life cycle of the bluebottle fly makes them an attractive food source in many freshwater environments.

Target Species

In the UK, virtually all freshwater fish species find casters irresistible. From the mighty barbel, known for its strength and size, to the diminutive stickleback, casters can be the key to a successful catch. Their effectiveness is akin to that of maggots, another popular bait, making them a staple in the angler’s arsenal.

Adaptability in Fishing Techniques

Casters can be used in various fishing techniques, whether you’re ledgering for bottom feeders or float fishing for mid-water swimmers. Their adaptability makes them suitable for different rigs and conditions, ensuring that anglers can use them in a multitude of fishing scenarios.

A barbel fish that was caught using frozen casters.
Fish such as barbel will feed on casters

Understanding which fish are likely to bite on casters, and how to present them effectively, can greatly enhance an angler’s success rate. Whether fresh or frozen, casters remain a potent bait choice for anglers targeting a diverse array of fish in freshwater systems.

How do You Hook Frozen Casters?

Make sure you handle casters delicately to avoid bursting their soft bodies.

What You Need

Clean Sharp Size 18 or 20 hook

Step 1 –

Pierce the flatter end of the caster with the hook point.

Step 2 –

Thread the hook through the side, ensuring the shell is not completely crushed.

Step 3 –

Aim to hide most of the hook within the caster, leaving the point slightly exposed for effective hooking.

Step 4 –

Ensure the caster maintains its natural shape for an enticing presentation to the fish.


Learning how to properly freeze casters is an invaluable skill for any angler, offering a practical way to extend the life of their bait. This technique not only ensures that you have bait ready for your next trip but also promotes cost-effectiveness by reducing the need to purchase fresh bait each time. While frozen casters may not entirely match the texture of fresh ones, they remain a practical option, particularly for ground baiting or as loose feed.

To maintain their best quality, it’s advisable to use the frozen casters within a month, as prolonged freezing can lead to freezer burn and a decline in bait quality. Having a supply of frozen casters can enhance the fishing experience, allowing for spontaneous trips and the pleasure of being prepared, thus potentially increasing the chances of a successful catch.

Frequently Asked Questions

Can I freeze casters more than once?

Freezing casters more than once really isn’t advisable. They will certainly turn black, smelly, and mushy. Making them pretty unusable.

Can casters hatch in a freezer?

Casters definitely will not hatch while they are in your freezer. Do not fear you definitely will not end up with a freezer full of blue bottles.

Can pre-frozen casters be used as hookbait?

If the casters that you have frozen can be hooked without falling apart then they will be fine to use as hook bait. If they do tend to fall apart or are a bit soft then just use them as loosebait or add them to your groundbait.

Do frozen casters lose their effectiveness compared to fresh ones?

Frozen casters can be slightly less effective than fresh ones due to changes in texture. However, they are still a good bait choice, especially for ground baiting or when fresh casters are not available.

How long can I store frozen casters before they go bad?

Frozen casters are best used within a month. Beyond that, they may suffer from freezer burn or lose their appealing texture and scent to fish.

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