Adult Jumping Spider Diet: Feeding Frequency, Variety, and Portions

Adult jumping spiders are active daytime hunters that eat insects and other small arthropods. In captivity, most adults do well with live prey that matches their hunting style, including house flies, bottle flies, small crickets, and small roach nymphs. Mealworms can be offered, but they are usually better as part of a rotation instead of the only food source.

A good adult diet focuses on three things: correct prey size, reasonable feeding frequency, and variety over time. Many care guides use a simple rule that prey should be smaller than or about equal to the spider's body length. That helps lower the risk of prey fighting back and makes hunting more successful.

Variety is helpful because different feeder insects have different moisture, fat, and nutrient profiles. Flies often encourage natural hunting behavior. Crickets and roach nymphs can work well as staples when they are appropriately sized and well fed before use. Waxworms are usually best treated as occasional treats because they are richer and can make the diet less balanced if used too often.

Hydration is part of nutrition too. Jumping spiders usually drink water droplets from enclosure surfaces, so light misting on one side of the habitat is often more useful than a bowl. If your spider is eating poorly, looks wrinkled, or stays tucked away longer than expected, review both feeding and hydration before assuming it is only a food problem.

For many adult jumping spiders, one feeding every 5-7 days is a reasonable starting point. Some adults, especially smaller males or less active spiders, may eat less often. Others may need food a little sooner after a smaller meal. Instead of following the calendar alone, watch the abdomen. A gently rounded abdomen is usually a better sign than a strict schedule.

Portion size depends on the prey item. For an adult, that may mean one appropriately sized fly, one small cricket, one small roach nymph, or occasionally one to a few smaller prey items if each insect is tiny. If you are using mealworms, offer them sparingly and supervise closely because some feeders can bite or burrow if left unattended.

Avoid offering prey that is much larger than the spider's body. Even though jumping spiders can sometimes overpower larger prey, that does not make it the safest routine choice in captivity. Oversized prey can cause stress, failed hunts, or injury.

If your spider ignores food, do not keep adding more insects. Remove uneaten prey and try again later. Adults also stop molting after maturity, so a long fast in an adult is less likely to be a pre-molt issue than it would be in a juvenile. If appetite drops along with weight loss, dehydration, poor movement, or a shrunken abdomen, it is time to contact your vet.

A feeding problem may show up as a noticeably shrunken or wrinkled abdomen, repeated refusal of prey that used to be accepted, weak jumping, poor grip on surfaces, or spending unusual amounts of time low in the enclosure. Dehydration can look similar, so it helps to review both food intake and access to water droplets.

Watch for prey-related problems too. If a cricket, roach, or mealworm is left with the spider for too long, the feeder can stress or injure your pet. A spider that appears interested but backs away repeatedly may be telling you the prey is too large, too active, or not a preferred type.

Adult females may naturally look fuller than males, so body shape should be judged in context. A very swollen abdomen after repeated large meals can suggest overfeeding, while a flat or raisin-like abdomen is more concerning for underfeeding or dehydration.

See your vet immediately if your jumping spider is unable to climb, curls its legs under the body, becomes unresponsive, or has sudden collapse. Those signs can point to severe dehydration, injury, toxin exposure, or another urgent problem. For milder appetite changes that last more than a week or two, your vet can help you review husbandry, prey choice, and hydration.

If your adult jumping spider does not do well with one feeder type, safer alternatives often include house flies, bottle flies, or other captive-raised flying feeders that encourage natural hunting. Many adults respond better to flying prey than to worms left in a dish.

Small roach nymphs and small crickets can also work well when they are no larger than the spider's body and are removed if not eaten. If you use mealworms, offer them occasionally rather than as the only staple, and supervise because they can bite. Waxworms are best saved for rare treats.

For pet parents who want a simpler routine, rotating between two staple feeders is often enough. For example, you might use flies for one feeding and a small cricket or roach nymph for the next. Gut-loading feeder insects before use can improve the overall nutritional value of the meal.

If your spider refuses all common feeders, avoid wild-caught insects. They may carry pesticides, parasites, or pathogens. Instead, ask your vet or an experienced exotic animal professional which captive-raised feeder options are most appropriate for your spider's species, size, and condition.