Siberian dace

Where they come from

Siberian dace are coldwater cyprinids from northern Asia. You see them in the Lake Baikal basin and a bunch of Siberian river systems where the water is clear, fast, and icy for a big chunk of the year. They cruise in loose shoals, picking at drifting bugs and tiny crustaceans, then run up into shallows with gravel to spawn as the ice goes out.

Setting up their tank

Give them length, current, and clean, cool water. They are busy swimmers and do poorly in warm, still setups.

• Size - aim for a 6 ft tank for adults. 75 gallons works for a small group of juveniles; 120+ gallons is much better long term.
• Group - 6 or more. Lone fish get jumpy and go off food.
• Temperature - 6-18 C most of the year. Short peaks to 20 C are tolerable. Avoid sustained heat.
• pH and hardness - mid to slightly alkaline works fine (roughly pH 6.8-8.0, 4-15 dGH). Stability beats chasing numbers.
• Flow and oxygen - strong, laminar flow with heavy aeration. They are different fish once the water is moving.

Filtration-wise, think big canister plus added flow. I like a river-manifold style setup or at least dual spray bars pointing the same direction. Add airstones or a powerhead with a venturi. Cold water holds more oxygen, but they still use a lot of it.

Substrate can be rounded gravel with some cobbles. Leave open lanes along the front and back for swimming. Plants are optional. If you want green, go with hardy cool-water choices like hornwort, elodea, or vallis, and anchor them well. Keep a tight lid; they jump like torpedoes.

What to feed them

Omnivores with a big insect habit. They are not picky if the food moves with the flow. Mix it up and keep portions modest.

• Staple - quality coldwater or insect-based pellets 1-3 mm. I scatter them into the current so everyone gets a shot.
• Frozen - bloodworms, daphnia, mysis, krill chunks, chopped prawn. Rotate to avoid boredom.
• Live - blackworms, daphnia, mosquito larvae in season. Great for conditioning.
• Greens - blanched spinach or peas now and then, plus the odd algae wafer.

How they behave and who they get along with

Fast, social, and easily startled. In a group they settle down and spend most of the day cruising the current. During feeding they can get boisterous, but I have not seen deliberate aggression in a roomy tank.

• Good tank mates - other coolwater cyprinids of similar size (other dace, ide), hillstream loaches, stone loaches, weather loaches, larger white cloud types or bitterling. All of these like current and cooler temps.
• Avoid - tropical community fish, fancy goldfish, long-finned fish, or tiny nano species that could be viewed as snacks or get outcompeted.

Break up sight lines with rocks so subdominant fish can duck out. Spread food along the current so the bold ones do not hog it. Tight lid again, because they will jump if startled by a shadow or a knock on the glass.

Breeding tips

They are seasonal spawners. It can be done in captivity, but you need a cool winter and a spring ramp-up. Males develop tiny spawning tubercles on the head and fins; females look rounder with eggs.

• Conditioning - several weeks on live and frozen foods while keeping temps low.
• Winter rest - hold them 2-6 C for 6-8 weeks with a short photoperiod.
• Spring trigger - raise to 10-14 C over a week or two, extend day length, and increase flow.
• Spawning site - shallow, fast area over rounded gravel or marbles with a mesh grate to catch eggs.
• Adults do not guard - they will eat eggs. Move adults out once you see active spawning or move the grate with eggs to a hatching tank.

Eggs hatch in roughly 3-10 days depending on temperature. Start fry on infusoria or rotifers, then move to newly hatched brine shrimp and microworms. Keep flow gentle but well aerated, and cap filter intakes with fine sponge.

Common problems to watch for

• Heat stress - the big one. Above 20 C for long stretches and they go off food, breathe fast, and get spotty. Plan cooling before summer.
• Low oxygen - even in cool water, heavy fish load plus high flow can outpace aeration. Add air and surface agitation.
• Ich and flukes - show up after import or heat swings. Ich runs slower in cold tanks, so treatments take longer. Dose by water volume and keep oxygen maxed.
• Parasites from wild-caught fish - do a proper quarantine. I use observation first, then targeted meds if I see wasting or flashing.
• Nose rub and jumping injuries - reduce reflections, keep the lid tight, and avoid sudden light changes.
• Water quality creep - they eat well and produce a lot. Stick to big, regular water changes and keep the filter spotless so flow stays strong.