The Purple Pincher Crab
Land-dwelling hermit crabs live in many parts of the world where climates are tropical. These tropical regions have, for the most part, warm temperatures year around and plentiful rainfall. Of the many kinds of land-dwelling hermit crabs, only purple pinchers live in the United States. They are found in southern Florida.
Purple pinchers also live on Caribbean islands and in other tropical habitats as far south as Venezuela. In fact, purple pinchers are often called Caribbeans.
Purple pinchers sometimes live a distance away from the water. No matter where they live in the wild, however, purple pinchers always migrate back to the seashore so that their eggs can be hatched in the ocean.
Purple pinchers begin life as the tiniest of creatures that float on the surface of the sea. It is a good thing that a female hermit crab lays a lot of eggs, because whales and other big sea creatures gobble up most of the young crabs.
The purple pinchers that manage to survive soon grow much bigger. A smallish purple pincher bought for a pet might be less than 1 inch (2.5 centimeters) long. A large purple pincher could be more than 3 inches (7.6 centimeters) long.
Hermits are people who live by themselves. They often stay indoors, and they usually avoid others. A hermit crab lives all its life inside a shell. It never leaves its shell except when it moves into another shell.Purple pinchers are a kind of hermit crab. But unlike people who are hermits, purple pinchers like company. In the wild, they live in groups and are fairly social.
Most purple pinchers are friendly. But, just like people, each purple pincher is unique. Some purple pinchers are shy, while others are bold. There are purple pinchers that like to play a lot, while others are less active. Some purple pinchers enjoy being handled, others may want to be left alone.
Most purple pinchers get along well with other purple pinchers. Sometimes they fight over shells, but it is rare for purple pinchers to be aggressive with another hermit crab.
Purple pinchers are inexpensive and cute, and they like to play. These crabs are fun to watch and easy to care for. When you buy a purple pincher, it is important to make sure you get a healthy animal. Go to a pet shop where the staff have a lot of experience in caring for hermit crabs. Look for an active hermit crab that you find interesting.
Purple pinchers are relatively safe pets. Some types of pets—certain turtles or aquarium fish, for instance—can carry diseases that may be caught by humans and that can make humans very ill. Hermit crabs do not usually carry any such diseases.
Purple pinchers are omnivores—meaning they eat everything—fruit, plants, fish, and even red meat. It is best to feed crabs hermit-crab food and a variety of human foods. Crabs especially like fruit and cuttlefish. To keep life interesting for your pets, offer them a balanced diet, but vary that diet.
Purple pinchers are very sensitive to pesticides (bug-killing chemicals). Make sure you feed your purple pincher food grown without pesticides or else rinse the food very well.
Purple pinchers drink mostly fresh water. But sometimes they like to drink salt water, so offer both kinds of water.
Do not make salt water for your pet from ordinary table salt, which contains a chemical called iodine. Iodine is harmful to hermit crabs. Use salt from a pet store that is made for fish aquariums.
Finally, chlorine—a chemical put in tap water to kill germs—can also kill hermit crabs. Give your crab purified, bottled water instead of tap water.
Purple pinchers are not demanding creatures, but they need a particular kind of warm, humid habitat, or living place, or they cannot survive.
To give your purple pincher a good habitat, purchase a glass or plastic aquarium tank. Make sure the tank has a secure lid so your hermit crab does not climb out. Also, make sure the lid can be opened to allow air to flow into the tank when needed.
Keep a thermometer in the tank. Knowing the temperature allows you to make adjustments to keep the inside of the tank between 75 and 85 °F (24 and 29 °C). Use a low-wattage, incandescent light bulb to keep the tank warm, or buy an under-tank heater to warm the tank from below.
It is a good idea to keep a hygrometer in the tank to measure humidity, that is, the amount of water vapor in the air. Hermit crabs need an environment of around 70 percent humidity. You can use sea sponges soaked in water to maintain the humidity in a tank.
With attention to a few details, you can turn a good habitat, or living place, into a great crabitat. Purple pinchers like to dig and to bury themselves, so they need bedding twice as deep as they are tall. Finely crushed coral from a pet store is ideal. Play sand or beach sand also makes good bedding, and sand is easy to replace when you clean the tank each month. For variety, you can put coconut fiber or fine gravel in part of the tank.
Put two shallow bowls in the tank: one for fresh water and one for food. Do not use metal bowls, because metal can be harmful to hermit crabs. If your crabs are small, put a sponge in the water bowl so the crabs will not get trapped in the water and drown. Some crabs need a third bowl for saltwater.
Add cork bark or driftwood to the tank so your crabs can exercise and play. Add hollow logs, dig your crab some small caves, and put in some plants so your hermit crab can hide when it wants to be alone. And don’t forget shells. Supply a variety of shells for your purple pinchers to grow into.
Purple pinchers have things they need done to their crabitat on a daily, weekly, and monthly basis.Daily—Take uneaten food out of the tank and add new food. Change the water. Also, check the temperature and humidity of the tank. If the humidity is too high, open the top of the tank a bit. If the humidity is too low, add an extra sponge to the water bowl.
Weekly—Replace the dry food and water and scoop out the crab’s droppings. Don’t forget to clean or replace the sponge. To clean a sponge for reuse, first rinse it, let it dry completely, then microwave it for about 2 minutes.
Monthly—Wipe the tank and wash everything in it, but never use soap or cleaning chemicals. You can also microwave the pieces of driftwood and cork in the tank for about 2 minutes to clean them. (Ask a grown-up for help with the microwave.) Replace the tank’s bedding each month.
Purple pinchers keep themselves clean. Although they do not need to be bathed, purple pinchers can benefit from a bath every week or two. This helps the animals flush out their shells and wet their gills.
There are two ways to bathe a purple pincher. One way is to fill a small bowl with about 1⁄4 inch (0.64 cm) of warm, chlorine-free water. Gently place the purple pincher upside down in the small bowl. The animal will turn over and walk around, shaking out any debris within its shell. The other way is to fill a small bowl with warm, chlorine-free water and gently dunk the purple pincher in the water two or three times. Do not put the crab under the water for too long or it will drown! After the bath, let the purple pincher walk around in a clean box lined with a paper towel.
In addition to bathing, many owners also use spray bottles to mist their purple pincher. This helps the animal to stay moist. Hermit crabs usually become more active after mistings.
Purple pinchers are nocturnal creatures, which means they are more active at night than during the day. To encourage your pets to be as active as possible when they are awake, add toys to their tank. Purple pinchers love to play. In addition to providing cork and coral, you can add many other playthings. For example, hermit crabs like to run around plants and hide in caves.
Purple pinchers like to climb, too. They will climb over rocks, driftwood, and unpainted clay flowerpots. Just make sure they cannot use their toys to get high enough to climb out of their tank.
If you supervise your purple pinchers so they do not get lost, you can let them outside the tank to explore. If your house is warm, you can even put your crabs, one at a time, into a plastic “hamster ball” and let them roll around a room.
Purple pinchers vary in their reactions to being handled. While some like to be handled, others do not. When handling your purple pincher, never try to take it out of its shell. Most hermit crabs will risk injury to avoid being pulled from their shell.
When handling your purple pincher, let it get to know you. Pick it up gently by the back of its shell. Make sure you do not create any big shadows or make any sudden movements that would scare your purple pincher. Simply hold your hand out and place the crab on your flat, outstretched palm. Be patient; it may take a while for your crab to feel safe.
If your purple pincher pinches you, do not try to pull it off. It will only pinch harder. To get a hermit crab to release its hold, put the crab under warm, running water. If that doesn’t cause the crab to release its hold, dunk the animal gently in a bowl of lukewarm water.
Pet purple pinchers do not have young, because their eggs will not hatch in a tank. In the wild, however, hermit crabs spend a lot of time getting ready to have their young.
At mating time, some kinds of hermit crabs get together in large groups, called “crab conventions.” At conventions, crabs seek out new and larger shells and find mates.
After mating, a female crab carries her eggs on the left side of her abdomen until they are ready to hatch. Then she scurries to the ocean and releases the eggs.
The young of purple pinchers are extremely tiny. They spend the beginning of their lives as plankton, or small water organisms floating on the surface of the ocean. Fish and other sea creatures eat most of them.
If a purple pincher escapes being eaten, it eventually comes ashore to begin its life as a land hermit crab.
Like most hermit crabs, purple pinchers molt, or shed, their exoskeleton and grow a strong, fresh one to cover everything but their abdomen. Most hermit crabs molt at least once every 18 months. Young hermit crabs molt more often.
Molting allows purple pinchers to grow, but the process also poses problems. While they are molting, the crabs are weak. Their sensitive skin is uncovered, so the crab can dry out or be easy prey for other animals. For these reasons, crabs usually bury themselves while they are molting. Leave your purple pincher alone if you think it is molting.
You only need to investigate if you smell a strong fishy smell, which can indicate a dead crab.
In time your crab will reappear with a fresh, new exoskeleton. Be sure to have larger shells available, as your crab will most likely need a new one after molting. Most hermit crabs gain bulk as their exoskeletons swell and harden.
Hermit crabs, including purple pinchers, sometimes make a chirping sound, but no one has quite figured out how they make this sound. Scientists have suggested that a hermit crab makes these sounds by rubbing its legs against one another.
However this noise is made, a hermit crab can sometimes be heard to produce it when it is annoyed. For example, when another hermit crab is climbing on it or when it is engaged in the occasional shell fight.
Hermit crabs have other ways of making noises than chirping. Sometimes an animal may make clicking sounds by tapping on its shell with its claw. At other times, a hermit crab may bang its shell against the shell of another crab to produce a noise. Hermit crabs usually make more noise at night, when they are more active.
Purple pinchers are not the only hermit crabs with a purple pincher. Indonesian crabs have much larger pinchers that are also purple.
Some Indonesian crabs use a coconut for a home, instead of a shell. Other Indonesian crabs prefer to live in a turbo shell (a shell once belonging to a kind of snail called a turbo).
Crabs that live inland from the sea, such as the Indonesian, usually find their first shell on the shore, since they are born in the ocean. Then these crabs move inland. But, hermit crabs go to the ocean periodically to allow the female to lay her eggs in the sea. The males accompany the females on this trip. Traveling back to the ocean gives such hermit crabs as the Indonesian an opportunity to find new shells on the shore. Land hermit crabs can also sometimes find new shells inland that have been abandoned by other hermit crabs.
Purple pinchers that are ill are usually sluggish and do not move their antennae around. (Purple pinchers that are getting ready to molt may act this way, too.) Check that the crabitat has the correct temperature and humidity.The number-one killer of pet hermit crabs is the lack of a proper habitat. Hermit crabs must have a warm, moist environment. If they get too hot or dry, they will die. Be sure to keep your crabitat away from windows and other sunny spots. Never leave your hermit crab in a car where it can become overheated.
Sometimes, purple pinchers can get a fungus. To get rid of this fungus, bathe your crab in a saltwater and then a freshwater bath. Small parasites that feed on crabs can sometimes invade a tank. To get rid of them, bathe your hermit crab. Then, clean its tank with a solution of vinegar and water and rinse it with chlorine-free water. Finally, replace the tank bedding and clean everything else that was in the tank. If the parasites remain, call a veterinarian for additional advice.