Silverfish, Slaters and Occasional Invader Pests

Silverfish and slaters are occasional invader pests that wander into food premises from damp, dark or poorly sealed storage areas rather than breeding in your food. On their own they rarely contaminate food directly, but their presence signals excess moisture, clutter or gaps in the building fabric — the same conditions that invite cockroaches and rodents. Under the Food Standards Code, businesses must keep premises free of pests and control the environment they thrive in. Key takeaways: Silverfish and slaters are occasional invaders that come in from damp, dark and outdoor areas rather than establishing large populations in food.. Their direct food-safety risk is low, but their presence is an early warning of moisture, clutter or building gaps that attract worse pests.. The Food Standards Code requires premises to be kept free of pests and designed to exclude them — there is no acceptable number of visible pests in a food area.. The most durable control is environmental: reduce moisture, remove harbourage and seal entry points, not just spray.. Persistent or rising numbers, or the arrival of cockroaches or rodents, mean it is time to bring in a licensed pest technician.. What silverfish and slaters actually are Silverfish are small, wingless insects with a silvery, teardrop or carrot-shaped body and a darting, fish-like movement. They feed on starches and sugars — flour and cereal residues, paper, cardboard, glue and book bindings — and they thrive in warm, humid, undisturbed places such as store-room corners, behind skirting and inside stacked packaging. Slaters, also called woodlice or pill bugs, are not insects at all but land-living crustaceans. They are grey and segmented, some rolling into a ball when disturbed, and they need constant dampness to survive. They normally live outdoors in soil, leaf litter and under objects, feeding on decaying plant matter, and only wander indoors when conditions outside push them in. Both are classed as occasional invader pests. Unlike cockroaches or rodents, they do not usually build large breeding populations feeding on your stock. They drift in from damp voids or the outdoors, which is why finding them is more useful as a signal than alarming as an infestation. Springtails, millipedes and earwigs behave the same way. Why they turn up and what it signals Moisture is the common thread. Both silverfish and slaters need humidity to survive, so a consistent presence almost always points to a damp problem: a slow leak, condensation, poor ventilation, standing water, damp cardboard on the floor, or mould in a neglected corner. Slaters in particular signal dampness or decaying matter close to the building. This makes them useful indicator species. A few silverfish behind a dry-store skirting are not a plague — they are a prompt to find the moisture or clutter that is sustaining them. Read their presence diagnostically and you fix the real problem rather than chasing the symptom. Entry points matter just as much. These pests get in through gaps around pipes and doors, unsealed skirting, and dense vegetation or debris pressed against external walls. Where you find them often tells you where your building fabric is failing. The real food-safety risk The direct risk from silverfish and slaters is low, but it is not zero. Silverfish can get into poorly sealed dry goods such as flour and cereal, and both can leave faeces, shed skins and scales, or damage packaging in ways that let more serious pests reach the contents. Any visible pest in a food-handling or storage area is also a hygiene and regulatory failure, regardless of the species. The bigger risk is what their presence predicts. The damp, cluttered, poorly sealed conditions that suit silverfish and slaters are the same conditions that attract cockroaches and rodents. Treat minor invaders as an early warning system: acting on them now can head off a far harder infestation later. From a customer and inspection point of view, perception counts too. Finding silverfish in a store room during an inspection raises reasonable questions about cleaning, moisture control and stock rotation across the whole operation. What the Food Standards Code requires Australian food businesses operate under the Australia New Zealand Food Standards Code. Standard 3.2.2 (Food Safety Practices and General Requirements) requires businesses to take all practicable measures to prevent pests entering the premises and to eradicate and prevent the harbourage of pests on the premises and connected areas. Standard 3.2.3 (Food Premises and Equipment) supports this by requiring premises to be designed, constructed and maintained to exclude pests and dirt, and to be easy to clean — with sealed gaps, sound floors and walls, and adequate drainage. Together these standards focus on excluding pests and denying them the conditions they need, rather than setting a tolerable number of any species. There is no acceptable count of visible pests in a food area under the Code; the obligation is to keep premises free of them. How registration, licensing and pest-control expectations are administered varies by state and territory and by local council, so confirm the specific requirements for your business with your local council or state regulator. Fixing the conditions: moisture, clutter and exclusion Because these are environmental pests, the most effective and lasting control is environmental. Three levers do most of the work: cut the moisture, remove the harbourage, and seal the gaps. Spraying alone rarely holds if the damp store room that feeds them is left untouched. Work through the practical measures rather than reaching for chemicals first: Reduce moisture: fix leaks and dripping pipes, improve ventilation, address condensation, dry-mop and avoid standing water, and consider a dehumidifier in a persistently damp store.. Remove harbourage and clutter: keep cardboard and stock off the floor and on shelving or racking, rotate stock first-in-first-out, and clean behind and under equipment where debris and moisture collect.. Exclude entry: seal gaps around pipes, cabling, skirting and doorframes, fit door sweeps and insect screens, and keep vegetation, mulch and rubbish clear of external walls.. Deny food sources: clean up flour, sugar and crumb residues promptly and store dry goods in sealed, pest-proof containers.. Monitoring and when to call a professional Build simple monitoring into routine cleaning. Inspect the damp and dark zones — under sinks, behind store-room shelving, around floor wastes — and place discreet sticky traps in corners to gauge whether numbers are steady, rising or falling. Record sightings in a pest log with the date and location so you can see trends rather than reacting to one-off encounters. A written log also supports due diligence. If an inspector asks, being able to show that you noticed, investigated and acted on a pest signal demonstrates active control rather than neglect. Know when environmental control is not enough. Persistent or increasing numbers, sightings spreading into food-handling areas, or the appearance of cockroaches or rodents alongside the invaders are signals to engage a licensed pest management technician. Many businesses maintain an ongoing pest management program with a professional, which combines expert inspection with targeted, compliant treatment. Using chemicals safely if you need them Environmental control should always come first, but where baits or sprays are used near food, they must be handled with care. Only use products suitable for a food premises, follow the label directions exactly, and keep chemicals well away from food, packaging and food-contact surfaces during and after application. Store pest-control chemicals separately from food, in a labelled and secure location, and keep the safety data sheet (SDS) for each product accessible to staff. Safe Work Australia guidance on chemicals covers safe handling, storage and the role of the SDS in managing workplace chemical risks. Because misapplied pesticides can themselves become a contamination hazard, chemical treatment is often best left to a licensed technician who can choose and place products correctly. For occasional invaders, sound moisture control and exclusion will usually achieve more than any spray. Checklist: Damp and dark zones (under sinks, behind shelving, around drains) are inspected on a set schedule. Leaks, condensation and poor ventilation are identified and fixed rather than tolerated. Cardboard and dry stock are kept off the floor, sealed where possible and rotated first-in-first-out. Gaps around pipes, doors and skirting are sealed and insect screens are intact. External walls are kept clear of vegetation, mulch, debris and rubbish. Sightings are recorded in a pest log with date and location to track trends. A licensed pest technician is engaged when numbers persist or cockroaches or rodents appear. Any pest-control chemicals are stored away from food, with the SDS kept and label directions followed. Common mistakes: Spraying visible pests while ignoring the leak, condensation or damp cardboard that is sustaining them. Leaving stock and packaging on the floor, creating the exact dark, damp harbourage these pests seek. Treating a few silverfish as harmless and missing the moisture or clutter signal they represent. Failing to seal gaps around pipes, doors and skirting, so invaders simply walk back in. Keeping no pest log, so trends and the arrival of more serious pests go unnoticed. Storing pest-control chemicals near food or without a safety data sheet on hand. Assuming a national rulebook and not confirming local council or state regulator requirements.