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Categories
Pets and Animals
Crustaceans
Crabs
How to Feed Sand Crabs Download Article Co-authored by Marshall Stephens
Last Updated: February 24, 2025 References
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Studying Wild Sand Crabs
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Keeping Sand Crabs in a Tank
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Things You'll Need
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This article was co-authored by Marshall Stephens. Marshall Stephens is an Aquarium Expert at Private Oceans Aquariums in West Palm Beach, Florida. Marshall has over 20 years of experience in the aquarium industry and focuses on captive-bred animals. They specialize in tropical and marine aquariums and are a contributor to the Loggerhead Marine life center in Jupiter Florida. This article has been viewed 177,806 times.
In the wild, sand crabs burrow into the sand where the water meets the shore. Larger sand crabs feed on baby turtles and seagull carcasses; smaller crabs root for mollusks, worms, plankton, and algae. Sand crabs are saltwater creatures that need high temperatures to survive. Thus, they are very difficult to keep in aquariums. If you must keep a sand crab in an aquarium, your best bet may be to frequently replenish its tank with fresh, plankton-rich beach sand.
Steps
Method 1 Method 1 of 2:
Studying Wild Sand Crabs
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1 Understand how sand crabs behave in the wild. They burrow into the littoral sand where the tide meets the shore, and they scavenge most of their food from what they find buried in the sand. The term "sand crab" describes a variety of large (often predatory) and small (often scavenging) species, and you must suit any feeding regimen to your particular crab. Consider the differences between large and small sand crabs:
Larger sand crabs tend to feed on live or decaying prey that they find while burrowing. This prey may include smaller crabs, baby turtles, and the carcasses of dead shorebirds. As larger crabs burrow, they aerate the sand. This helps to keep air and water circulating in their habitats.[1]XResearch source
Smaller sand crabs feed on mollusks, worms, plankton, and algae. They are mostly scavengers: they keep their ecosystem clear of decomposing organic matter, which could host harmful bacteria.
2 Observe how sand crabs naturally feed. The crabs bury themselves in the sand, facing the ocean, with only their eyes and front antennae exposed. When the tide recedes and washes over them, they unfurl a second set of antennae that filter tiny plankton from the water. The movement happens very quickly. Thus, a sand crab can gather several morsels from each receding wave.[2]XResearch source
Most crabs can move in any direction—forward, backward and sideways—but a sand crab moves only backward. Thus, it must position itself carefully to reap its meals from the waves.
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3 Know the mating habits of sand crabs. In the wild, mating occurs mostly in spring and summer. A female may produce as many as 45,000 eggs. She carries them on her abdomen until the eggs hatch – about 30 days later. For two to four months, the larvae drift as plankton, and currents can carry them far across the sea.[3]XResearch source
Sand crabs can reproduce during their first year of life if the water is warm enough. They don't usually live longer than two to three years.
Advertisement Method 2 Method 2 of 2:
Keeping Sand Crabs in a Tank
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1 Consider the challenges of removing sand crabs from the wild. They are saltwater shore-dwellers, and they need high temperatures to survive. Sand crabs live in rhythm with the tides, and it can be difficult to replicate the delicate littoral ecosystem in which they thrive. Furthermore, sand crabs feed on such a diverse diet that you may have a hard time giving them the variety they're used to.
2 Set up a tank with fresh beach sand and seawater. In the wild, sand crabs bury themselves deep in wet sand and catch plankton with their antennae. Replicate this process by filling your crab's habitat with beach sand, then pouring seawater over the sand a few times each day.[4]X Expert Source Marshall StephensAquarium SpecialistExpert Interview Use any glass aquarium. Bear in mind that sand crabs cannot dig in sand that is too dry or densely-packed.[5]XResearch source
Try to bring the beach sand directly from the ecosystem where you got the crab. Local beach sand is more likely to contain the insects and microorganisms that your crab needs.[6]X Expert Source Marshall StephensAquarium SpecialistExpert Interview
Sand crabs naturally gather in shoals, so it should be okay to put several sand crabs in the same tank. Remember, however, that large crabs like to eat smaller crabs.
3 Regularly refill the tank with seawater. Homemade saltwater will not do; it needs to contain algae and plankton. You can buy plankton, algae, and aquarium-grade seawater at some aquarium-supply and exotic pet stores. Be warned that these supplies can be expensive.[7]XResearch source
Understand that this tactic is a short-term experiment to study the behavior of a sand crab. It is not necessarily a sustainable, long-term way to keep a sand crab as a pet. If you only need to study the sand crab for a short time, consider returning it to the wild when you're done.
4 Consider getting a hermit crab instead. Sand crabs are difficult—sometimes nearly impossible—to keep as pets. If you are looking for a crab that's easy to raise and feed, consider getting a hermit crab. Do your research, create a habitat, and learn to care for hermit crabs.[8]X Expert Source Marshall StephensAquarium SpecialistExpert Interview [9]XResearch source
Aquarium hermit crabs thrive on practically any food, from algae and leftover fish food to beef, eggs, and vegetables. In the wild, hermit crabs have been known to eat leaves, fruit, and even wood. You can also buy commercial hermit crab food that mimics the crab's natural diet.
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Question How do I get plankton? Community Answer You may buy it, or use natural beach water. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 11 Helpful 52
Question What can I keep a sand crab in? Community Answer Keep your sand crab in a tank with beach sand. The tank should be big enough for your sand crab to be able to walk around without feeling cramped. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 11 Helpful 44
Question Will sand crabs multiply in the tank? Community Answer Yes. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 10 Helpful 52
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Things You'll Need
Sand crab
Suitable habitat - this means a breathable container of some sort, like a miniature empty fish tank or bowl.
Beach sand
Seawater
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Co-authored by: Marshall Stephens Aquarium Specialist This article was co-authored by Marshall Stephens. Marshall Stephens is an Aquarium Expert at Private Oceans Aquariums in West Palm Beach, Florida. Marshall has over 20 years of experience in the aquarium industry and focuses on captive-bred animals. They specialize in tropical and marine aquariums and are a contributor to the Loggerhead Marine life center in Jupiter Florida. This article has been viewed 177,806 times. How helpful is this? Co-authors: 13Updated: February 24, 2025 Views: 177,806 Categories: CrabsArticle SummaryX
To feed sand crabs, fill their tank with beach sand, which contains insects and microorganisms that crabs like to eat. Then, pour seawater over the sand a few times a day to provide your crabs with algae and plankton. If you can, try to get the sand and water from the beach the crabs came from, since it's likely to have everything the crabs need. Alternatively, buy sand and aquarium-grade seawater, which contain algae and plankton, at an aquarium-supply or exotic pet store. For information on how to study sand crabs in the wild, keep reading!Did this summary help you?YesNo
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Reader Success Stories
Aleris D.
Apr 5, 2018
"The article told me about the difficulties of having sand fleas/sand crabs/mole crabs as a pet. It let me know what they need in a simple yet descriptive way. Also, gave a bit of info on the crab itself. "..." more Rated this article:
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Marshall Stephens Aquarium Specialist Click a star to vote Co-authors: 13Updated: February 24, 2025 Views: 177,806
Aleris D.
Apr 5, 2018
"The article told me about the difficulties of having sand fleas/sand crabs/mole crabs as a pet. It let me know what they need in a simple yet descriptive way. Also, gave a bit of info on the crab itself. "..." more Rated this article:
K. W.
Jul 22, 2017
"It helped me to know some more about sand crabs and how they need ocean water for the plankton. I am going to let them go as I now know that they can't be kept long as pets. "..." more Rated this article: Share yours! More success stories Hide success stories
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Download Article Co-authored by Marshall Stephens 
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Co-authored by: Marshall Stephens Aquarium Specialist This article was co-authored by Marshall Stephens. Marshall Stephens is an Aquarium Expert at Private Oceans Aquariums in West Palm Beach, Florida. Marshall has over 20 years of experience in the aquarium industry and focuses on captive-bred animals. They specialize in tropical and marine aquariums and are a contributor to the Loggerhead Marine life center in Jupiter Florida. This article has been viewed 177,806 times. How helpful is this? Co-authors: 13 Updated: February 24, 2025 Views: 177,806 Categories: Crabs Article SummaryX
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1 Understand how sand crabs behave in the wild. They burrow into the littoral sand where the tide meets the shore, and they scavenge most of their food from what they find buried in the sand. The term "sand crab" describes a variety of large (often predatory) and small (often scavenging) species, and you must suit any feeding regimen to your particular crab. Consider the differences between large and small sand crabs: 
2 Observe how sand crabs naturally feed. The crabs bury themselves in the sand, facing the ocean, with only their eyes and front antennae exposed. When the tide recedes and washes over them, they unfurl a second set of antennae that filter tiny plankton from the water. The movement happens very quickly. Thus, a sand crab can gather several morsels from each receding wave.[2] 
3 Know the mating habits of sand crabs. In the wild, mating occurs mostly in spring and summer. A female may produce as many as 45,000 eggs. She carries them on her abdomen until the eggs hatch – about 30 days later. For two to four months, the larvae drift as plankton, and currents can carry them far across the sea.[3] 
1 Consider the challenges of removing sand crabs from the wild. They are saltwater shore-dwellers, and they need high temperatures to survive. Sand crabs live in rhythm with the tides, and it can be difficult to replicate the delicate littoral ecosystem in which they thrive. Furthermore, sand crabs feed on such a diverse diet that you may have a hard time giving them the variety they're used to. 
2 Set up a tank with fresh beach sand and seawater. In the wild, sand crabs bury themselves deep in wet sand and catch plankton with their antennae. Replicate this process by filling your crab's habitat with beach sand, then pouring seawater over the sand a few times each day.[4] Use any glass aquarium. Bear in mind that sand crabs cannot dig in sand that is too dry or densely-packed.[5] 
3 Regularly refill the tank with seawater. Homemade saltwater will not do; it needs to contain algae and plankton. You can buy plankton, algae, and aquarium-grade seawater at some aquarium-supply and exotic pet stores. Be warned that these supplies can be expensive.[7] 
4 Consider getting a hermit crab instead. Sand crabs are difficult—sometimes nearly impossible—to keep as pets. If you are looking for a crab that's easy to raise and feed, consider getting a hermit crab. Do your research, create a habitat, and learn to care for hermit crabs.[8] [9] 
Community Answer You may buy it, or use natural beach water. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 11 Helpful 52 
Community Answer Keep your sand crab in a tank with beach sand. The tank should be big enough for your sand crab to be able to walk around without feeling cramped. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 11 Helpful 44 
Community Answer Yes. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 10 Helpful 52 