The short answer: they're not. If you weigh an isopod and compare it gram-for-gram with, say, a horse, then sure - but that's not a sensible way to think about it. Unlike horses, dogs, cats, parrots or even fish, isopods are essentially a one-time purchase. There are barely any ongoing food costs, the enclosure needn't be expensive, they don't need fancy lighting, there are no vet bills, and if you get things right they breed - so your colony grows itself. A few rare or in-demand species do command higher prices, but even those are excellent value compared with most other pets. Here's why.
Why Are Some Isopods Pricey?
A handful of species genuinely cost more, and it comes down to rarity, breeding speed and demand. Take something like Lemon Blue isopods - one of the pricier species we keep. They're relatively rare, need more specialist care, and like many species newly arrived in the hobby they've taken a great deal of work to dial in so they'll breed reliably in captivity. They're also slow breeders, so even after all that effort they produce far fewer young than a fast species would. Low supply, high demand and slow breeding all push the price up.
But that's the exception, not the rule, and it's no guide to what isopods cost in general. A hardy, prolific species like Dairy Cows (a Porcellio laevis morph) breeds readily, is just as much fun to keep, and costs very little - you can buy a large starter group for the price of a takeaway, all from quality captive-bred stock. The rare species are a treat to splash out on; they're not what isopod-keeping costs.
Isopods vs Other Pets: The Real Cost
The purchase price of any animal is usually the least of the costs - it's the ongoing upkeep that adds up. That's where isopods win.
Compare them to fish. Guppies are among the cheapest fish to keep, and a starter group is inexpensive - but cheaply mass-bred fish often carry a parasite or disease burden that can spread to the rest of your tank, and from poor-quality, hormone-treated parents the fry tend to decline in quality. On top of that you need a tank, food, filtration, a heater, dechlorinator and regular water changes - ongoing cost, electricity and effort, indefinitely. At the luxury end, rare fish like discus, arowana and freshwater stingrays run into thousands; a single show fish can cost as much as a small car. Is a £20,000 fish expensive? Of course. But it shows how wide the "pet pricing" spectrum really is.
With isopods - especially hardy species that live happily on leaf litter in an unheated enclosure - the purchase can be 90% of the total lifetime cost. That makes them one of the cheapest pets to keep over their whole life. There's huge diversity to choose from too, from temperate species that need no heating to tropical ones, so you can pick to suit your budget and setup.
What Do You Actually Need to Keep Isopods?
Starting from scratch, the kit is minimal and much of it can be cheap or free:
- An enclosure. Anything from a smart glass terrarium to a small fish tank, a vivarium, or simply a plastic tub. A secondhand find from a car boot sale or marketplace works perfectly.
- No heating or lighting, if you choose a room-temperature species like Porcellionides or Porcellio. That's a big ongoing saving compared with tropical pets.
- A moisture-retaining substrate and a layer of leaf litter - which you can collect for free from clean, unsprayed areas (just check the leaves and wood are safe and pesticide-free).
- A bit of wood for them to climb on, hide under and eventually eat, plus the occasional supplement depending on species. Their appetites are tiny, so feeding costs are negligible.
In short, after the initial purchase and a modest setup, the running costs are about as low as any pet gets - they largely feed themselves on cheap or free leaf litter, and a healthy colony quietly replaces itself.
So, Are Isopods Really That Expensive?
No. They can be one of the cheapest pets to keep over a lifetime - so it's worth splashing out a little on a more exciting species if you fancy one. Hardy, beginner-friendly options like Porcellio or Trachelipus let you do exactly that while still keeping a pet that won't cost you a fortune, has a wonderfully low carbon footprint, and never needs walking on a cold morning.
Frequently Asked Questions
Why do some isopods cost so much?
Price comes down to rarity, demand and breeding speed. Rare species that are new to the hobby, need specialist care and breed slowly produce few young, so they're scarce and command higher prices. Hardy, fast-breeding species are cheap by comparison.
Are isopods expensive to keep?
No - they're one of the cheapest pets over their lifetime. Most of the cost is the initial purchase; after that, hardy species need no heating or lighting, eat cheap or free leaf litter, never see a vet, and breed to replace themselves.
What's the cheapest way to start keeping isopods?
Pick a hardy room-temperature species, house them in a simple plastic tub or secondhand terrarium, use a moisture-retaining substrate topped with free, pesticide-free leaf litter, and add a bit of wood. That's genuinely all you need to begin.
Do isopods save money over time?
Yes. With no heating (for hardy species), no filtration, no vet bills and a nearly free diet, ongoing costs are minimal - and because they breed, a single starter group can become a self-sustaining colony rather than a repeat purchase.
Are cheap isopods lower quality?
Not necessarily - many of the best beginner species are inexpensive simply because they breed quickly and are abundant. What matters more is buying healthy, captive-bred stock from a reputable source than paying a high price.
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