Jaguar loach
Yasuhikotakia splendida
Yellow tail polka dot loach exhibits a slender body with a distinctive pattern of yellow spots on a dark background, featuring a prominent tail fin.
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About the Jaguar loach
A compact Mekong-basin loach with a bold tail ring and yellow fins peppered with black spots, it looks like a tiny predator in camo. Kept in groups it forms pecking orders and even makes audible clicks during spats, so it is lively to watch but not a community pushover. ([fishbase.se](https://www.fishbase.se/summary/Yasuhikotakia-splendida))
Also known as
Quick Facts
Size
10 cm SL
Temperament
Semi-aggressive
Difficulty
Intermediate
Min Tank Size
53 gallons
Lifespan
5-15 years
Origin
Southeast Asia
Diet
Omnivore - sinking pellets and wafers, frozen/live invertebrates (bloodworm, mysis, chopped worms); will take snails
Water Parameters
26-30°C
6.5-7.5
Need a heater for this species?
This species needs 26-30°C in a 53 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Start with at least a 53-gallon tank and keep a group, not singles or pairs; they set a pecking order and you will hear clicking during spats.
- Stack wood, rocks, and tight caves to break sightlines and give retreats; use smooth sand or fine rounded gravel so their barbels do not get abraded.
- Hold temperature at 26-30 C and pH at 6.5-7.5, and keep conditions stable and clean.
- Feed a mix of quality sinking pellets/wafers and meaty frozen/live foods like bloodworm, mysis, and chopped worms; they also relish snails.
- Pick robust, active tankmates and skip delicate or slow long-finned fish; Jaguar loaches are semi-aggressive and not a community pushover.
- They live 5-15 years, so plan your stocking around a long-term group.
- Breeding in home aquaria is not reliably documented for this species, so do not expect fry.
Compatibility
Good Tankmates
- A same-species group of 5-7 Jaguar loaches; they spread aggression within the shoal and are calmer when kept together
- Fast, robust midwater barbs kept in large schools, e.g., tiger barbs (Puntigrus tetrazona)
- Schooling rainbowfish that like warm, well-oxygenated water, e.g., Melanotaenia spp. kept in a group
- Larger rasboras in groups, e.g., scissortail rasbora (Rasbora trilineata) or a big group of harlequin rasboras (Trigonostigma heteromorpha)
- Armored, warm-tolerant plecos that mind their own business (bristlenose Ancistrus, Hypancistrus), with plenty of caves and line-of-sight breaks
Avoid
- Shrimp and snails - they will be hunted or picked at as part of the loach diet
- Slow fish with long fins that invite harassment, e.g., angelfish, fancy bettas, long-finned gouramis
- Very small or delicate schooling fish that spook easily, e.g., neon tetras, ember tetras, microrasboras
- Territorial bottom competitors and similarly combative species, e.g., tiger loaches (Syncrossus), red-tail or rainbow sharks, aggressive cichlids
Jaguar loach (Yasuhikotakia splendida) is a compact Mekong-basin botiine with a bold dark ring at the tail and yellow fins flecked with black. It looks like a tiny ambush predator in camo. In groups it sorts out clear pecking orders and you will hear audible clicks during squabbles. Lively to watch, but not a community pushover.
Origin and natural habitat
Freshwater loach from Southeast Asia, native to the Mekong basin. That fast-growing river system spans several countries and hosts many sand- and gravel-bottom stretches, which is where this genus is typically encountered.
Aquarium setup and water conditions
Despite its small adult size (up to about 10 cm SL), this is an active, social loach that needs room and cover. Plan for at least 53 US gallons. Use plentiful hardscape and caves so subdominant fish can duck out of sight, and leave open floor space for sorties.
- Temperature: 26-30 C
- pH: 6.5-7.5
- Water type: freshwater
Keep a group rather than a single specimen so the pecking order spreads across several fish and individual aggression is diluted.
Diet and feeding
An opportunistic omnivore that forages on or near the bottom. Offer a varied mix and do not rely on one food type.
- Staples: quality sinking pellets and wafers
- Protein: frozen or live bloodworm, mysis, chopped earthworms/blackworms
- It will also take snails, including small ornamental species
Behaviour and tankmates
Semi-aggressive with its own kind and not timid. Group dynamics involve chasing, posturing, and clicking sounds, especially at feeding time. It is generally fine with robust, fast tankmates that occupy other levels, but it can hassle slow or very small fish that cannot get out of the way.
- Good fits: sturdy midwater fish of similar size that are not easily bullied
- Use caution with: shy, long-finned, or tiny species; delicate bottom dwellers that compete for the same floor space
Common pitfalls to avoid
- Cramped quarters: small tanks or few hiding spots can turn sparring into persistent bullying. Provide space and broken lines of sight.
- Keeping too few: a lone fish or a pair often focuses aggression. A proper group lets a hierarchy settle.
- Snail casualties: this species actively eats snails and will wipe out decorative or cleanup snails in the tank.
- Ignoring the heat: it is a warm-water loach; extended periods below 26 C can leave it sluggish and more prone to scuffles.
If you keep ornamental snails or rely on them for algae control, house them separately. Jaguar loaches will hunt them.
Lifespan is typically 5-15 years with stable warm water, varied diet, and low-stress social housing.
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