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三線鼠魚© Bob Jenkins / CC BY 2.0

三線鼠魚

Corydoras trilineatus is a small catfish with a pale body dotted with black speckles, a worm-like maze pattern on its head, and a dark horizontal band running along its flank. Many of the fish sold under the name "Julii" actually belong to this species, prized among aquarists as a wild-collected favorite. Its rounded body and unhurried, foraging movements make it endearing to watch, especially in a group scouring the substrate together. Calm and sociable by nature, it gets along well with a wide range of tankmates, and its beginner-friendly reputation makes it an easy species to start with. Watching it sift through the bottom of the tank brings a quiet, grounding pleasure to any aquarium.

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關於三線鼠魚

Corydoras trilineatus, known for its speckled body and maze-like head pattern, is a calm, beginner-friendly bottom-dwelling catfish often sold as "Julii."

迎接三線鼠魚前需要了解的7件事

  1. 1Often Sold as "Julii"

    Fish sold under the trade name "Julii" are, in many cases, actually this species rather than the true Corydoras julii. Because the two look similar, it helps to check the distinctive dark flank band and the maze-like head pattern before buying.

  2. 2Thrives in Groups

    Corydoras are naturally social and tend to school together. Keeping several individuals in the same tank reduces shyness and hiding, making it easier to enjoy their active, curious behavior on the tank floor.

  3. 3Soft Substrate Matters

    This species constantly sifts through the substrate while foraging, using its sensitive barbels to search for food. Sharp or coarse gravel can irritate or wear down these barbels, so a fine, rounded sand substrate lets it forage naturally and comfortably.

  4. 4Good Community Fish

    Peaceful and non-aggressive, this fish pairs well with other small, similarly sized species. Because it spends most of its time near the substrate, it rarely competes for space with fish that occupy the mid- or upper-water levels.

  5. 5Sensitive to Sudden Changes

    Like most Corydoras species, this fish can be sensitive to abrupt shifts in water parameters or temperature. Acclimate it slowly when introducing it to a new tank, and favor small, frequent water changes over large, infrequent ones to keep it settled.

  6. 6Watch for Signs of Low Oxygen

    Corydoras can breathe air at the surface using intestinal respiration, so occasional trips to the surface are normal. If this behavior becomes unusually frequent, however, it can signal low dissolved oxygen, making it a useful cue to check aeration.

  7. 7Cycle the Tank Before Arrival

    Even though this species is considered beginner-friendly, a freshly set-up tank tends to have unstable water conditions. Letting the filter's nitrogen cycle establish itself before adding fish helps create an environment where the Corydoras is less likely to develop health issues.

三線鼠魚的常見問題

Q.How big does Corydoras trilineatus grow?
A.It typically reaches about 5.5 to 6.1 cm (2.2 to 2.4 inches) as an adult, making it a compact species that suits relatively small tanks.
Q.Is this species suitable for beginners?
A.Yes, it's generally considered beginner-friendly. That said, it's sensitive to sudden changes in water quality, so regular partial water changes and careful acclimation are recommended.
Q.Is this the same fish sold as "Julii"?
A.Many fish sold under the trade name "Julii" are actually this species. It closely resembles a related species in pattern, which is why the two are often confused in the trade.
Q.Can it be kept with other fish?
A.Yes, it's peaceful and pairs well with other small, similarly sized fish. Since it stays mainly near the bottom, it rarely conflicts over territory with mid- or upper-level swimmers.
Q.Is this species subject to CITES?
A.Corydoras trilineatus is not subject to CITES.

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