Silverfish are ancient, wingless insects that need one thing above all: humidity — sustained relative humidity around 75% and up is where they thrive and reproduce. Mobile delivers that most of the year, which is why the Gulf Coast sees silverfish pressure that homes in drier climates simply never build.

They feed on carbohydrates and protein bound up in everyday household storage: paper and the sizing in it, book bindings and wallpaper paste, cardboard, photographs, natural-fiber fabric, and pantry starches like flour and rolled oats. They’re nocturnal, fast, and secretive — by the time you’re seeing them in the tub or on the closet floor regularly, a breeding population is established somewhere humid and undisturbed.

The classic Mobile harborage map follows the moisture: bathrooms and laundry rooms (the most humid rooms in the house), closets and stored boxes (food and shelter in the same cardboard), attics and crawl spaces (humid, dark, rarely disturbed — especially over older Midtown and Spring Hill homes), and kitchens and pantries where starches sit in original packaging. Damage shows up as irregular scraped patches and notched edges on paper and fabric, yellowish stains, and pepper-like droppings in drawers and boxes.

One more Mobile-specific wrinkle: the same humid closets and attics that hold silverfish also support clothes moth activity — if you’re finding fabric damage alongside silver insects in the same storage space, mention both when you submit your ZIP so the operator scopes the inspection for both.

• Crack-and-crevice treatment in the rooms with activity — baseboard gaps, plumbing penetrations, behind trim — placed where silverfish travel, not fogged across open air.
• Dusts and baits in voids — wall voids, attic edges, under-sink cabinets, and the dead spaces behind built-ins where sprays never reach and silverfish actually live.
• Attic and crawl-space work where the population is sourced — this is where Gulf Coast jobs are won or lost, because an untreated humid attic reseeds the living space below.
• The moisture punch list — the operator flags what’s feeding the humidity: a bath fan venting into the attic instead of outside, crawl-space ventilation, a slow leak under a sink, gutters dumping at the foundation.
• Follow-up expectations — silverfish are slow breeders compared to roaches, so a properly placed treatment plus moisture correction holds; many households fold it into a quarterly service conversation with the operator.

What you can do alongside the operator’s work — and none of it requires a product: run the bath fans and a dehumidifier in problem rooms, swap cardboard for sealed plastic bins, get storage up off concrete floors, fix the drip, and thin out the stored paper they’ve been eating.

• “Silverfish or firebrat — and does it change the plan?” Firebrats run hotter spaces (water heaters, attics in summer); silverfish run cooler-humid ones. The distinction tells you whether the operator looked closely.
• “Where’s the breeding population sourced?” If the answer doesn’t name a specific humid zone — the attic, a crawl space, a chronically wet cabinet — the plan is treating symptoms.
• “What’s on my moisture punch list?” A silverfish plan with no humidity homework is incomplete on the Gulf Coast. Expect specifics: vent the bath fan outside, bins instead of boxes, dehumidifier target percentages.
• “What’s your ADAI license number?” Every legitimate Alabama operator has one, and the Alabama Department of Agriculture & Industries’ Pesticide Management Section — (334) 240-7240 in Montgomery — can confirm it. Pros answer without blinking.
• “Is this bundled into quarterly service, and what does re-service cover?” Many operators fold silverfish into a general program — get what’s included, and what triggers a no-charge return visit, in writing.