Polka Dotted Loach (Schistura corica)

Polka Dotted Loach overview

Polka Dotted Loach (Schistura corica) is a small Asian brook loach for aquarists who enjoy active bottom-dwelling fish and natural river-style aquariums. Petra lists this stock as Schistura / corica, supplied around 3-4 cm, so this page has been corrected around that identity.

This listing is currently out of stock. The care notes below are kept here so you can plan the right aquarium before new stock becomes available.

Quick facts

Natural habitat and behaviour

Schistura corica is associated with South Asian river and stream habitats, including India, Pakistan, Nepal and Bangladesh in published references. FishBase describes adults from clear hill streams with sandy bottoms and also from larger river habitat with mixed sand, mud, gravel, pebble, cobble and boulder substrate. That natural history is the clue for aquarium care: clean water, high oxygen, smooth stones, sand and sheltered crevices matter more than bright decoration.

Like many nemacheilid loaches, it spends most of its time close to the substrate, inspecting gaps between stones and resting in cover. The spotted and broken-band pattern gives the fish camouflage over gravel and cobbles. Its value is as a specialist small loach for a mature freshwater aquarium with stable conditions and enough structure at the bottom.

Aquarium setup

Build the aquarium around flow, oxygen and secure bottom cover. Use fine sand or smooth rounded gravel, then add rounded stones, small caves, driftwood roots and shaded gaps. A mature filter with good biological capacity is important, and a powerhead or carefully directed filter return can help create steady movement without blasting the fish around the tank.

For a single specimen, we recommend at least 60 litres with a strong footprint and mature filtration. If you keep more than one, use a larger aquarium with several separate rock piles and visual breaks. Loaches Online notes that this species can be territorial with other Schistura corica, so cramped groups can lead to chasing and fin damage. A group is only sensible when the tank is large enough for each fish to claim cover.

• Use a mature, fully cycled aquarium.
• Provide oxygen-rich water and regular partial water changes.
• Use smooth substrate to protect the belly and barbels.
• Add several caves, stones and shaded resting points.
• Avoid sharp decor, stagnant water and sudden temperature changes.

Feeding

Feed this loach as a small omnivorous micropredator. Offer quality sinking micro-pellets or wafers as a base, then vary the diet with frozen bloodworm, brine shrimp, daphnia, mosquito larvae and other small foods that reach the bottom. Feed modest portions and watch that faster midwater fish do not intercept everything before it reaches the loach.

Because this is a small bottom fish from flowing water, uneaten food should not be allowed to collect in the substrate. Strong oxygenation and clean water are part of feeding success, especially with richer frozen foods.

Tank mates

Choose peaceful, stream-suitable companions that enjoy clean, well-oxygenated water and will not bully a small loach. Small danios, peaceful barbs, rasboras and other active but non-aggressive fish can work when their temperature needs match. Avoid large cichlids, predatory fish, fin nippers, slow delicate bottom dwellers and any fish likely to occupy the same shelter aggressively.

If you want to compare similar bottom-dwelling choices, see Mahnert's Loach, Vinciguerra's Stone Loach, Sumo Loach, Hillstream Loach and Zebra Loach. These are related-style aquarium choices, not direct substitutes, so check each species' temperature, adult size and temperament before mixing.

Breeding and long-term care

Aquarium breeding is not commonly documented for this species. References for related nemacheilid loaches suggest seasonal cues and clean gravel spaces may matter, but this should be treated as an advanced project rather than an expected outcome. For normal keeping, focus on stability: avoid sudden changes, keep oxygen high, and maintain a clean substrate.

New loaches should be acclimated slowly, then allowed to settle with lights subdued and cover available. Watch feeding response, breathing rate and interactions with tank mates during the first week. A healthy Polka Dotted Loach should rest in cover, forage actively and hold position comfortably in gentle current.

Availability note

This SKU is unavailable at the moment. We keep the corrected care guide live so the page reflects the real Petra identity and so customers can prepare properly before restock. When suitable stock returns, the product page will show live availability and checkout options.