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Hikari Medaka
Oryzias latipes
Animalia›Chordata›Actinopterygii
Variety of Medaka · hikari
📍 Japan
The Hikari Medaka is a double-fin mutation where both the dorsal and anal fins take on the shape of the other fin, creating a symmetrical fish. A popular fancy variety in Japanese medaka breeding.
Care Guide
Diet
Hikari Medaka are omnivorous and accept high-quality flake foods, micro pellets, and small frozen foods like brine shrimp and daphnia. Feed small amounts once daily, only what they can consume in 2-3 minutes. Supplement occasionally with blanched vegetables like spinach for optimal nutrition.
Behavior
Hikari Medaka are peaceful, schooling fish that prefer to swim in groups of at least 6 individuals. They are active during daylight hours and exhibit graceful, deliberate movements due to their distinctive double-fin morphology. They are non-aggressive and spend time exploring plants and open water areas.
Breeding
Breeding Hikari Medaka in captivity is moderately difficult and requires stable conditions with temperatures around 24-26°C and plenty of fine-leaved plants for egg attachment. Females are prolific egg-layers, producing small clutches regularly when well-fed and conditioned. Fry are tiny and require infusoria or liquid fry food initially before graduating to micro foods.
Tank Mates
Closely related species with identical care requirements and peaceful temperament
Similar size, temperament, and water requirements; both prefer cooler temperatures
Peaceful invertebrates that share similar water conditions; provide hiding spots for shrimp
Small, peaceful algae-eaters that occupy different tank zones and prefer similar temperatures
Peaceful scavengers that help maintain tank cleanliness without competing for food
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, flashing against surfaces, lethargy
Gradually raise temperature to 28-29°C, perform daily 25% water changes, use aquarium salt (1 teaspoon per 5 gallons) or commercial ich treatment; maintain for 10-14 days
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, fin loss
Improve water quality with frequent partial water changes, remove uneaten food, treat with antibacterial medication if severe; ensure good filtration and stable parameters
Columnaris (Flexibacter columnaris)
Whitish film on body, mouth rot, lethargy, loss of appetite, rapid gill movement
Increase aeration, perform 50% water change, treat with antibacterial medication; maintain temperature at 24-25°C and ensure excellent water quality
Dropsy
Swollen abdomen, scales standing out (pine-cone appearance), lethargy, loss of appetite
Isolate affected fish, perform frequent water changes, feed high-quality foods; treatment is difficult; may indicate organ failure or bacterial infection requiring antibiotics
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