How to keep maggots alive

A live maggot moves, and movement is most of what it offers. A dead maggot is a small pale object of the right size and none of the behaviour, and fish that are feeding confidently often ignore it. Keeping maggots alive is also keeping them at the right STAGE: a maggot's job is to be a maggot, and once it starts turning into a caster it is a different bait with different uses.

A ventilated bait box with a lid that breathes. Maggots produce heat and ammonia in bulk, and a sealed container concentrates both — a tub of maggots left shut in a warm car does not suffocate so much as cook and poison itself. Shallow and wide beats deep and narrow, because depth is what causes a mass to overheat in the middle.

Cool, and steady. Cold slows the maggot's development towards pupation, which is why bait fridges exist and why a bait box on a warm windowsill produces casters within a day or two. The principle is more useful than a number: the colder it is kept, the slower it turns, and the more consistent the temperature the more predictable the bait. Freezing kills them.

No aeration is needed, but air exchange is. Maggots breathe through spiracles and a mass of them consumes oxygen and produces carbon dioxide and ammonia steadily, so the container needs ventilation rather than an air pump. A lid clamped tight on a full box is the commonest way anglers kill maggots without noticing.

Dry maize meal, sawdust or a proprietary bait maize, in enough quantity to separate the maggots and absorb moisture. The medium is not food — it keeps them clean, dry and apart. Damp bedding is the problem: maggots in wet medium sweat, the mass heats, and the whole box turns. Riddling the bait through a maggot riddle to replace fouled maize is the standard maintenance action.

Days rather than weeks, and how many depends almost entirely on how cool they are kept and how recently they were riddled. Rather than a figure: expect them to turn faster than you want if they are warm, and to stay usable considerably longer if they are cold and clean. Judge by the bait, not by the calendar.

In a cool box or insulated bag rather than loose in a warm vehicle, with the lid ventilated. The journey is often the warmest part of a maggot's life and does most of the damage. Keep the box out of direct sun on the bank, and out of the footwell of a car standing in it.

Maggots are the larvae of flies and are not aquatic, so the direct disease risk to fish is lower than for aquatic live baits. The real biosecurity issue is what leaves the bank with them and what is left behind. Unused maggots tipped into a water introduce a large pulse of protein that a small still water may not absorb, and maggots escaping into the wider environment become flies. Keep them contained, take the container home, and never move bait medium or water between fisheries.

Maggots are invertebrates and welfare obligations are proportionate rather than absent. The practical version is the same as the practical version of keeping them useful: do not let a mass overheat and suffocate slowly, do not hold far more than the session needs, and do not keep bait indefinitely in deteriorating conditions because throwing it away feels wasteful. Buying what a session actually requires is the single most effective measure.

Take unused maggots home and keep them for the next session if they are still clean, or dispose of them in household waste in a sealed bag if they are not. Do not empty them into the water, do not leave them on the bank, and do not tip them into a hedge — in every case they either become a nutrient pulse in the fishery or hatch into flies where somebody has to deal with them.

Collecting, transporting, keeping and using live bait are regulated differently almost everywhere, and some of these baits may not be used at all in some waters. Restrictions commonly cover where and how much may be collected, whether live bait may be moved between waters, whether a species may be used as bait at all, and whether a licence or permit is required. FishingHQ does not state what any rule is or where it applies — check with the authority responsible for the water and the shore you intend to use before collecting or using live bait.