Thracian shemaya
Alburnus istanbulensis
The Thracian shemaya features a streamlined body with a silvery sheen and a distinctive blue-green lateral line.
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About the Thracian shemaya
Endemic to Turkey, occurring in coastal streams of Thrace (Marmara to SW Black Sea drainages) and Lake Sapanca; a small, silvery pelagic cyprinid (bleak/shemaya type).
Also known as
Quick Facts
Size
18 cm SL
Temperament
Peaceful
Difficulty
Advanced
Min Tank Size
30 gallons
Lifespan
3-6 years
Origin
Turkey (coastal streams of Thrace from Karasu (Marmara drainage) to Papuç (Black Sea drainage), and Lake Sapanca)
Diet
Omnivore - small insects/zooplankton, fine frozen foods, small pellets/flakes
Water Parameters
14-24°C
6.5-8
3-15 dGH
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Calculate heater sizeCare Notes
- Give them a long, open tank with serious flow and high oxygen - think river setup with powerheads and a spray bar, not a still planted cube.
- Keep the water cool to mild (about 60-72F / 16-22C) and clean; they crash fast in warm, low-oxygen water or when nitrates creep up.
- Use smooth sand or small rounded gravel and leave lots of swimming room; they spook easily, so add a few rock piles or wood tangles as break lines rather than dense plants.
- Feed like a picky, fast midwater hunter: small floating and midwater foods (daphnia, cyclops, mosquito larvae, finely chopped krill) plus a quality small pellet, in small portions 2-3 times a day.
- Keep them in a group (8-12+ if you can) or they get jumpy and beat up the weakest fish; a tight shoal also spreads aggression and looks way better.
- Tankmates need to like current and cooler water - other river minnows/barbs and small, tough bottom fish work; skip slow fancy fish, long fins, and warmwater species.
- Put a lid on the tank with zero gaps - they launch when startled, especially right after lights flip on or during chasing.
- If you try breeding, mimic spring: big cool water changes, strong flow, and fine gravel or a spawning mop; adults will eat eggs, so pull the parents or give the eggs a safe area.
Compatibility
Good Tankmates
- Temperate, current-tolerant schooling fishes of similar size (species-dependent); choose tankmates based on matching temperature and high-oxygen flow requirements.
- Small, peaceful rheophilic cyprinids like Odessa barbs or cherry barbs (again, in groups) - the key is active but not nasty fish, with enough room to swim.
Avoid
- Big aggressive cichlids (oscars, convicts, etc.) - they'll either bully them nonstop or eventually treat them like expensive live food. Shemaya is peaceful and not built for that kind of pressure.
- Fin-nippers and mean barbs (tiger barbs, some larger barbs if understocked) - shemaya is quick, but constant chasing turns it into a stress festival.
- Slow, fancy-finned fish like bettas, guppies with big tails, long-fin angels - the shemaya's zippy schooling vibe can freak slow fish out, and the slow fish can't compete at feeding time.
- Large predatory fish (pike cichlids, snakeheads, big catfish) - anything with a mouth sized for a slim, silver minnow is a bad mix, even if it seems 'calm' at first.
Where they come from
Thracian shemaya (Alburnus istanbulensis) is a wild cyprinid from the Thrace region around Istanbul. Think cool, fast, well-oxygenated river and stream habitats with current, clean gravel, and lots of open water. They are built for cruising all day, not hovering around decor like a tetra.
Most of the ones you see in the hobby are wild-caught or very close to wild stock. Plan on a fish that reacts like a river fish: quick, easily spooked at first, and picky about water quality.
Setting up their tank
Give them length and flow. Height is nice, but these fish use horizontal swimming space more than anything. If you cram them into a short tank, they get flighty and you will see more bumps, split fins, and stress.
- Tank size: bigger and longer is better - I would not do them in anything under a 4 foot tank for a group
- Group size: keep a proper shoal (at least 8-12). Singles and trios act nervous and crash into glass
- Filtration: strong biofilter plus real circulation. A canister with a spray bar, or a powerhead aimed down the length works great
- Oxygen: run surface agitation. These fish come from water that is always moving and breathing
- Substrate: sand or fine gravel with some rounded stones. Skip sharp rock that can scrape them when they bolt
- Decor: keep the middle open. Put hardscape and plants to the sides and back like a riverbank
- Lighting: moderate is fine. Too bright with no cover makes them skittish
They jump. A tight lid is not optional. Cover every gap around hoses and wires. I have lost shemaya through holes I would have bet were too small.
Temperature-wise, they do best on the cooler side for a community fish. Room temp to low 70s F is usually a happier range than warm tropical. Keep it stable, keep it clean, and do regular water changes because they are active and messy for their size.
What to feed them
They are midwater pickers and will take prepared foods once settled, but they are not slow, polite eaters. If you feed like you would for shy bottom fish, the shemaya will grab everything and the rest of the tank will starve.
- Staple: quality small pellets or micro-granules that sink slowly
- Frozen: daphnia, cyclops, brine shrimp, chopped bloodworms (use bloodworms as a treat, not every day)
- Live: small insects, daphnia, or baby brine shrimp if you want them in top shape
- Plant matter: they will nibble some, but do not count on them as algae control
Feed small amounts more than once. A quick morning feed and a second smaller feed later keeps them from going into full feeding-frenzy mode and smashing into each other.
New arrivals sometimes ignore dry food for a bit. Frozen daphnia or brine shrimp usually flips the switch. Once they associate you with food, they get bold fast.
How they behave and who they get along with
In a group, they are busy, always-moving open-water fish. They are not mean in the cichlid sense, but they are high-energy and can outcompete calmer species at feeding time. They also spook easily if the tank is too bare or you keep too few.
- Good tankmates: other cool-water, current-loving fish that can handle fast feeders (other river minnows/danios, some barbs, rainbow shiners where legal, hillstream loaches)
- Use caution: slow fancy goldfish, long-finned fish, or anything that needs warm water
- Avoid: tiny shrimp colonies (adults might survive, but babies will disappear), very timid small fish that get pushed off food
If they are glass-surfing or constantly panicking, it is usually one of three things: too small a group, not enough cover at the edges, or not enough flow/oxygen.
Breeding tips
Breeding them in a home aquarium is possible, but it is not a casual weekend project. In the wild they are seasonal spawners tied to temperature and flow. If you want to try, you are basically imitating spring: cool period, then a gradual warm-up with heavy feeding and lots of current.
- Conditioning: several weeks of varied foods (daphnia/brine shrimp, quality pellets) and big, frequent water changes
- Trigger: a slightly warmer bump after a cooler spell, plus a strong flow across a spawning area
- Spawning setup: smooth gravel, rounded pebbles, or spawning mops where eggs can fall out of reach
- Egg safety: assume they will eat eggs. Use a grate/marbles/mop so eggs drop away, or pull adults after spawning
- Fry: tiny foods first (infusoria/rotifers if needed), then baby brine shrimp
If your goal is conservation-type breeding, do your homework on local laws and sourcing. This is a regional species, and wild populations can be sensitive.
Common problems to watch for
Most issues I have seen come from treating them like generic community fish. They will live that way for a while, but they get run down: thin bodies, clamped fins, constant skittishness, then the usual opportunistic diseases show up.
- Jumping and impact injuries: caused by spooking, poor cover, or chasing in too small a tank
- Chronic stress: too few fish, too bright and bare, warm water, weak flow
- Wasting/weight loss: internal parasites are common in wild fish - watch for pinched belly and stringy feces
- Ich and other spotty outbreaks: often after shipping or big temp swings
- Fin nips: usually from overcrowding or mixing with nippy tankmates, but stressed shemaya can also start bickering
Quarantine is your friend with this species. Wild-caught fish plus a high-energy shoaling minnow equals fast-spreading problems if something comes in. A few weeks in a separate tank can save your whole setup.
If you keep the water clean, the tank long, and the group size decent, they settle into that classic river-minnow vibe: always on the move, always hungry, and honestly pretty addictive to watch.
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