Description
Fiddler Crab (Uca spp.)
📌 Basic Info
Scientific Name: Uca species (multiple varieties)
Common Names: Fiddler Crab, Mini Crab
Family: Ocypodidae
Origin: Brackish coastal regions – mudflats, estuaries, and mangroves (Africa, Asia, Americas)
Size: 1 – 2 inches (2.5 – 5 cm)
Lifespan: 2 – 3 years in captivity (longer in ideal conditions)
Tank Zone: Bottom dweller (semi-terrestrial – needs land & water area)
🌊 Water Parameters
TDS: 200 – 400 ppm
pH: 7.5 – 8.5
Temperature: 24 – 28°C (75 – 82°F)
Hardness: 8 – 15 dGH
Salinity: Brackish water (SG 1.005 – 1.015)
🦀 Characteristics
Named for the male’s oversized claw, used for mating displays and territorial signals.
Females have two small claws, while males have one giant claw and one small feeding claw.
Color varies – shades of brown, gray, orange, or blue with patterned shells.
Spend time both in water and on land – must have access to a dry area.
Active burrowers; create tunnels in sand or mud substrate.
🍽️ Food
Type: Omnivorous scavengers.
Diet: Algae wafers, sinking pellets, bloodworms, brine shrimp, chopped vegetables (zucchini, spinach, cucumber), detritus.
Feeding Schedule: Once daily; feed small amounts near their burrow or on land areas.
🛠️ Tank Setup & Maintenance
Tank Size: Minimum 10 gallons for 2–3 crabs.
Habitat: Must have both water and land (at least 50% land area).
Filtration: Gentle filter to maintain brackish water.
Substrate: Sand or fine gravel – deep enough for burrowing.
Decor: Rocks, driftwood, caves for climbing and hiding.
Water Changes: 20–25% weekly; keep brackish balance stable.
👥 Social Behavior
Social but territorial males may fight over space.
Best kept in small groups (1 male with multiple females).
Can be housed with some brackish fish or mollies, but avoid aggressive species.
May pinch slow fish or shrimp if given the chance.
✅ Do’s
Provide a proper land area for climbing and breathing.
Use brackish water – they don’t survive in full freshwater.
Keep secure lids – crabs are excellent climbers and escape easily.
❌ Don’ts
Don’t house multiple males in small tanks.
Don’t keep in full freshwater – shortens lifespan drastically.
Don’t keep with delicate or slow tankmates.
⭐ Quick Tips
Fun, interactive crabs with unique claw-waving displays.
Require brackish semi-aquatic setups, not pure freshwater.
Hardy and entertaining but need the right environment to thrive.
