Common Name: Cockroach Crab
Scientific Name: Aegla sp.
Other Names: Cockroach Crayfish, Freshwater Crab, Freshwater Squat Lobster, Aeglidae Crab
Aegla is a genus of freshwater crustaceans that are often referred to as freshwater crabs or aeglids. These small, crab-like creatures are unique to freshwater environments and have a distinctive appearance with a flattened, segmented body and large pincers. Their coloration can vary depending on the specific species and habitat, ranging from shades of brown and green to more vibrant hues.
Habitat and Distribution: Aegla species are native to freshwater habitats in South America, particularly in the regions of Argentina, Chile, Brazil, and Uruguay. They are commonly found in rivers, streams, and lakes, often inhabiting areas with rocky or sandy substrates and plenty of hiding spots.
Size and Lifespan: Aegla species are generally small, with body sizes typically ranging from 1 to 2 inches in length. Their lifespan can vary but is generally around 2-3 years in captivity, depending on the specific species and care provided.
Diet and Behavior: Aegla are omnivorous scavengers, feeding on a variety of plant matter, detritus, and small invertebrates. In captivity, they can be fed a diet that includes sinking pellets, algae wafers, and fresh vegetables such as spinach or zucchini. They may also consume frozen or live foods like bloodworms and brine shrimp. Aegla are generally peaceful but can be territorial, especially if space is limited.
Breeding and Reproduction: Breeding Aegla in captivity can be challenging. In the wild, they reproduce by laying eggs, which are carried by the female until they hatch. The young crabs go through several molts before reaching adulthood. Providing optimal water conditions and adequate hiding spots can increase the chances of successful breeding.
Aquarium Care and Tank Requirements: A minimum tank size of 10-20 gallons is recommended for a small group of Aegla. The aquarium should mimic their natural habitat with plenty of rocks, driftwood, and plants to provide hiding places. A soft substrate is preferable to avoid damaging their delicate underbellies. Good filtration and regular water changes are essential to maintain water quality.
Ideal Tank Mates: Aegla can be kept with small, peaceful fish that are not aggressive or overly territorial. Suitable tank mates include small tetras, rasboras, and other non-aggressive species. Avoid keeping them with large or predatory fish that might view them as food.
Difficulty Level: Intermediate. While not overly demanding, Aegla require stable water conditions and a suitable diet, making them best suited for aquarists with some experience.
Water Parameters:
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Temperature: 65-75°F (18-24°C)
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pH: 6.5-7.5
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General Hardness (GH): 5-15 dGH
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Carbonate Hardness (KH): 3-8 dKH
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Ammonia: 0 ppm
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Nitrite: 0 ppm
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Nitrate: <20 ppm
Additional Information:
- Aegla are fascinating additions to freshwater aquariums due to their unique appearance and behaviors.
- They play an important role as scavengers, helping to keep the tank clean by consuming leftover food and detritus.
- Observing their natural behaviors, such as foraging and molting, can be very rewarding for aquarists.
