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Electric Blue Crayfish (Procambarus alleni), also called blue crawfish or electric blue lobster, are one of the most eye-catching invertebrates you can keep in a freshwater aquarium. They are hardy and full of personality, but they are also territorial, skilled escape artists, and will eat slow tank mates. This care guide covers everything you need before you bring one home: tank size, water parameters, tank mates, diet, molting, breeding, lifespan, and legal considerations.
Electric Blue Crayfish Quick Facts
- Scientific name: Procambarus alleni (also sold as blue crawfish, blue crayfish, electric blue lobster, or Florida crayfish)
- Adult size: about 4–5 inches (10–13 cm); large males can approach 6 inches
- Lifespan: typically 2–3 years; up to 4–5 years with excellent care
- Minimum tank size: 20-gallon long for one adult, with a tight-fitting lid
- Temperature: 65–75°F (18–24°C)
- pH / hardness: pH 6.5–8.0 (about 7.0–8.0 is ideal); moderate to hard water
- Diet: omnivore — sinking pellets, blanched vegetables, occasional protein, plus calcium
- Temperament: territorial; best kept one per tank unless the tank is large
- Legality: restricted or prohibited in some U.S. states — check your state rules first
Where to Buy Electric Blue Crayfish
Ready to add one to your tank? You can buy Electric Blue Crayfish online here, or browse all of our freshwater crayfish for sale to compare species. Looking for a smaller blue crayfish for a nano tank? See the Blue Dwarf Crayfish (Cambarellus texanus) and our dwarf freshwater lobster collection. Every crayfish is quarantined before listing, packed carefully, and shipped live within the USA from our Virginia-based fish store, backed by our live-arrival guarantee.
Characteristics and Unique Features of Electric Blue Crayfish
The Electric Blue Crayfish, Procambarus alleni, is a freshwater crayfish known for its brilliant cobalt-to-electric-blue color. It is not a true lobster — "electric blue lobster" and "freshwater lobster" are trade names for aquarium crayfish.
Like all crayfish, they have a tough exoskeleton that they shed as they grow. Wild Procambarus alleni are usually brown or tan; the vivid blue seen in aquariums comes from selectively bred blue lines. Their claws, body, and tail are all blue, and the color can look paler for a while after a molt or shift to more subdued tones depending on diet and water conditions. Adults typically reach about 4–5 inches, and males grow larger claws than females.
The Natural Habitat of Electric Blue Crayfish
Procambarus alleni is native to Florida, where it lives in marshes, swamps, ditches, ponds, and slow-moving streams — habitats that can shift with the seasons. These freshwater crustaceans shelter under rocks, logs, roots, and plant cover and are most active around dusk and at night. Recreating plenty of hiding places in your aquarium is essential for their well-being.
While they are hardy creatures, Electric Blue Crayfish thrive best in a stable and well-maintained aquatic environment that mimics their native habitat.
Setting Up the Perfect Tank for Your Electric Blue Crayfish
Creating the right environment for your Electric Blue Crayfish is essential for their long-term health. For a step-by-step walkthrough, see our guide on how to set up a freshwater crayfish tank.
Tank Size
Plan on at least a 20-gallon long tank for one adult Electric Blue Crayfish; a 30-gallon or larger tank gives more room for caves and tank mates. Floor space matters more than height. If you plan to keep more than one crayfish, go considerably larger and provide a separate cave for each one to reduce fighting.
A Secure Lid Is a Must
Crayfish are expert escape artists and will climb filter intakes, tubing, and décor to get out. Use a tight-fitting lid, cover any gaps around cords and hoses, and keep the water line a little below the rim.
Water Parameters
Electric Blue Crayfish do best in neutral to slightly alkaline water with a pH of about 6.5–8.0 (7.0–8.0 is ideal) and moderate to hard water, which supplies the minerals they need to build a new shell after each molt. Keep ammonia and nitrite at zero and nitrate low. Avoid copper-based medications and plant fertilizers containing copper, which are toxic to invertebrates.
Temperature Requirements
Electric Blue Crayfish thrive in temperatures ranging from 65°F to 75°F (18°C to 24°C). Keeping the water within this range and avoiding sudden swings will help maintain their metabolism and overall health. In a cold room, use an aquarium heater with a thermometer to keep the temperature steady.
Maintaining Water Quality and Filtration
Crayfish are messy eaters, so a reliable filtration system is essential. A good filter will keep the water clear and prevent the buildup of waste. Regular partial water changes (around 20% every 1–2 weeks) will help keep the water fresh and oxygenated.
What Do Electric Blue Crayfish Eat?
Electric Blue Crayfish are omnivores and opportunistic scavengers. In the wild, they eat plant matter, insects, small animals, and detritus. In the aquarium, their diet should include a mix of:
Sinking pellets or wafers formulated for crayfish or shrimp as a staple.
Blanched vegetables such as zucchini, spinach, or peas.
Occasional protein such as bloodworms, brine shrimp, or small pieces of plain fish or shrimp.
Provide calcium sources such as cuttlebone to support healthy molts. Feed a small amount once a day and remove uneaten food after a few hours so it doesn't foul the water.
Electric Blue Crayfish Molting
Crayfish grow by molting — shedding their old exoskeleton and hardening a new, larger one. Juveniles molt every few weeks, while adults molt less often, roughly every few months. In the days before a molt, your crayfish may stop eating and hide more than usual. After molting, it is soft and vulnerable for several days, so make sure it has a secure cave and that tank mates can't harass it.
Leave the shed shell in the tank: crayfish often eat it to reclaim calcium. Stable water, adequate hardness, and a calcium-rich diet help prevent failed molts. A temporarily paler color right after a molt is normal and usually returns as the new shell hardens.
Electric Blue Crayfish Tank Mates
Tank mates are the most common question about Electric Blue Crayfish. The rule of thumb: choose fish that are fast, stay in the middle or upper water column, and are too large or too quick to be grabbed — and avoid anything big enough to eat the crayfish. For more ideas, see our list of the best tank mates for crayfish tanks.
Ideal Tank Mates for Electric Blue Crayfish
Barbs
Species like the Tiger Barb, Rosy Barb, and Cherry Barb are active, fast swimmers that tend to stay out of the crayfish's reach. Barbs also tolerate the cooler end of tropical temperatures, which overlaps well with the crayfish's range.
Rainbowfish
Known for their peaceful nature and striking coloration, Rainbowfish make excellent tank mates for Electric Blue Crayfish. Their active swimming habits and relatively large size make them a good fit for a crayfish community tank.
Gouramis
Larger species of Gouramis, such as the Pearl Gourami, spend most of their time near the surface and can live alongside Electric Blue Crayfish in a roomy tank with plenty of aquatic plants and hiding spots.
Plecos (with caution)
Larger, armored Plecos such as the Bristlenose Pleco can share a larger tank with a crayfish, but both are nocturnal bottom-dwellers that compete for caves and food. Give each its own hiding places, and avoid small or sick plecos that could be pinched while resting. You can also read about other algae-eating fish.
Cichlids (with caution)
Some robust, medium-sized cichlids can coexist with crayfish in a large tank, but this pairing is risky both ways: small cichlids may be caught, and large predatory cichlids such as Oscars will readily eat a crayfish, especially right after it molts. If you try it, choose a large tank with plenty of rockwork and watch closely.
Fish to Avoid as Tank Mates for Electric Blue Crayfish
Some animals should not be kept with Electric Blue Crayfish because they are small, slow, bottom-dwelling, or likely to be caught and eaten:
Small, Slow, or Long-Finned Fish
Species like Guppies, Cardinal Tetras, or Betta fish are poor choices. Small fish that rest near the bottom at night and slow fish with long fins are easy targets for a crayfish's claws.
Snails
Electric Blue Crayfish are skilled at cracking open and eating freshwater snails, including larger species such as Mystery Snails. In most crayfish tanks, snails end up as food rather than tank mates.
Other Crayfish
Since Electric Blue Crayfish are territorial, it's best to avoid keeping multiple freshwater crayfish in a single tank unless it is large enough to provide ample space and caves for each individual. In small tanks, crayfish will often fight, and a freshly molted crayfish can be seriously injured or eaten.
Small Shrimp
Small freshwater shrimp such as Amano shrimp or Cherry shrimp are likely to be eaten by Electric Blue Crayfish. These crustaceans are best kept in a separate tank.
Live Aquatic Plants for Electric Blue Crayfish
Crayfish will uproot, cut, and nibble many soft plants, so choose hardy species — ideally ones that can be attached to rock or wood instead of planted in the substrate. Here are some of the best aquatic plant options for an Electric Blue Crayfish tank:
Java Moss
Java Moss is a hardy plant that survives in a wide range of water conditions. It provides cover for juvenile crayfish and collects bits of food for them to graze on, making it a great addition to your aquarium tank. Crayfish may pick at it, but it grows back readily.
Anubias
Anubias species such as Anubias Nana, Anubias Nana petite, and Anubias Barteri have tough leaves and slow growth, making them an excellent choice for crayfish tanks. Attach them to rocks or driftwood so they can't be dug up.
Cryptocoryne
These sturdy freshwater plants do well in low to medium light. Once well rooted they tolerate some nibbling, though a determined crayfish may still dig them up, so protect the base with stones. Popular Cryptocoryne plants include Cryptocoryne wendtii, Cryptocoryne parva, and Cryptocoryne lutea.
Hornwort
Hornwort can be left floating out of the crayfish's reach, where it grows quickly and helps absorb excess nutrients. Pieces that drift down may be eaten, which is fine as an occasional snack.
Java Fern
Java fern is another hardy plant with leathery leaves that crayfish rarely eat. Like Anubias, it can be attached to rocks or driftwood.
Breeding and Raising Electric Blue Crayfish
Electric Blue Crayfish mature quickly and breed readily in the aquarium. After mating, the female carries her eggs under her tail (she is then called "berried") for roughly 3 to 4 weeks. The eggs hatch into tiny, fully formed crayfish — there is no free-swimming larval stage — and the young cling to the mother's swimmerets for a short time before venturing out.
Adults, including the mother, may eat the young once they leave her, so move the berried female or the juveniles to a separate tank with plenty of cover such as Java Moss. Feed the juveniles small sinking foods and keep the water clean and stable; they molt frequently as they grow.
Electric Blue Crayfish Lifespan and Size
Most Electric Blue Crayfish live about 2 to 3 years, and well-kept individuals can reach 4 to 5. They typically grow to 4–5 inches, with large males approaching 6 inches. Stable water, a varied diet with calcium, secure hiding places for molting, and compatible tank mates are the biggest factors in how long and how large your crayfish grows.
Is It Legal to Own an Electric Blue Crayfish?
In much of the U.S., Electric Blue Crayfish can be kept as aquarium pets, but crayfish are regulated at the state level. Some states restrict or prohibit possessing, selling, or transporting live non-native crayfish to protect native species and waterways, and the rules change over time. Before you order, check with your state fish and wildlife agency. Never release an aquarium crayfish — or its water or plants — into ponds, streams, or storm drains.
Electric Blue Crayfish Frequently Asked Questions
How big do Electric Blue Crayfish get?
Most adult Electric Blue Crayfish reach about 4 to 5 inches (10 to 13 cm) long, and large, well-fed males can approach 6 inches including claws. Males are usually bigger than females and grow noticeably larger claws. They reach this size gradually through a series of molts over their first year or so.
How long do Electric Blue Crayfish live?
Electric Blue Crayfish typically live about 2 to 3 years in an aquarium, and well-kept individuals can reach 4 to 5 years. Clean, stable water, a calcium-rich varied diet, hiding places for safe molting, and peaceful tank mates all help them live longer.
What size tank does an Electric Blue Crayfish need?
Plan on at least a 20-gallon long tank for one adult Electric Blue Crayfish, with a tight-fitting lid because they are skilled escape artists. A 30-gallon or larger tank gives more room for caves and tank mates. Keeping two or more crayfish together needs a much larger tank with multiple hiding spots, as they are territorial.
Do Electric Blue Crayfish need a heater?
Often not. Electric Blue Crayfish do best at about 65 to 75°F (18 to 24°C), so a tank kept in a room that stays in that range usually needs no heater. Use a heater in cold rooms or winter to keep the temperature stable, and avoid keeping them warmer than about 78°F for long periods.
What fish can live with Electric Blue Crayfish?
The best tank mates are fast, mid-to-upper-level swimmers that are too quick or too large to be caught, such as barbs, rainbowfish, and larger danios. Avoid small or slow fish, long-finned fish like Betta fish, bottom-dwellers that sleep on the substrate, shrimp, and snails. Also avoid large predatory fish such as Oscars, which may eat a crayfish, especially right after it molts.
What do Electric Blue Crayfish eat?
Electric Blue Crayfish are omnivores. Feed sinking pellets or wafers made for crayfish or shrimp as a staple, plus blanched vegetables such as zucchini, spinach, or peas, and occasional protein like bloodworms or brine shrimp. Add calcium sources such as cuttlebone to support healthy molts, feed small amounts once a day, and remove uneaten food.
How often do Electric Blue Crayfish molt?
Juvenile Electric Blue Crayfish molt every few weeks as they grow, while adults molt less often, roughly every few months. Before molting they may stop eating and hide. Leave the old shell in the tank, because the crayfish often eats it to reclaim calcium, and give it a secure cave while its new shell hardens over the next few days.
Are blue crawfish and electric blue lobsters the same animal?
Yes. Blue crawfish, blue crayfish, electric blue crayfish, and electric blue lobster are common names for the same freshwater crayfish, Procambarus alleni. It is not a true lobster; freshwater lobster is simply a trade name for aquarium crayfish. It is also different from the much smaller Blue Dwarf Crayfish, Cambarellus texanus.
Are Electric Blue Crayfish naturally blue?
Procambarus alleni is native to Florida, where wild crayfish are usually brown or tan and blue individuals are rare. The vivid blue color seen in the aquarium trade comes from selectively bred blue lines. Color can look paler for a while after a molt and can also be affected by diet and water conditions.
Is it legal to own an Electric Blue Crayfish?
In much of the U.S. it is legal to keep Electric Blue Crayfish as aquarium pets, but some states restrict or prohibit possessing, selling, or transporting live non-native crayfish to protect local waterways. Rules vary and change, so check with your state fish and wildlife agency before buying. Never release an aquarium crayfish into the wild.
Conclusion
Electric Blue Crayfish are an incredibly rewarding species to keep in a freshwater aquarium. Their stunning color, bold behavior, and interesting molting and breeding habits make them a favorite among aquarists. Give them a roomy, securely covered tank, stable water, plenty of caves, a calcium-rich diet, and fast tank mates, and your crayfish will thrive in its new home.
Ready to bring one home? Shop Electric Blue Crayfish for sale or browse our full selection of freshwater crayfish for sale.
At Splashy Fish tropical fish store, besides Electric Blue Crayfish for sale, we offer a wide variety of invertebrates for sale such as crayfish for sale, freshwater shrimp for sale, and freshwater snails for sale. We also carry freshwater fish for sale, live aquatic plants for sale, and aquarium supply. You can buy all of these aquarium products online or at our aquarium store in Virginia by following the map below.
