Hikari (Light Body)
Hikari is a medaka body type defined by dorsal and anal fins that mirror each other in shape. The scales along the back take on a metallic sheen from iridophores, so the fish flashes and sparkles as it swims under sunlight or aquarium lighting. Many lines come from crosses with Miyuki medaka, and the intensity and extent of the shine vary from fish to fish, giving each line its own character. Hikari medaka are calm-tempered, hardy, and strong swimmers, making a shoal especially lively to watch. With a beginner-friendly difficulty rating, they're an approachable choice for first-time keepers too.
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Hikari (Light Body) key facts
- Care level
- Beginner-friendly
- Lifespan
- 2-3 years
- Size
- 3-4cm
- Diet
- Medaka pellets
- Container & Tank
- Best viewed from above; a black, shallow container makes the light on the back stand out.
- Lighting
- Under sunlight or LED lighting the light on the back shines especially well, so place it where light falls and view from above.
- Water Temperature & Quality
- Hardy, keepable at 5-30°C in neutral to slightly alkaline water. Avoid sudden water changes.
- Breeding & Egg-laying
- Easy to breed; pairing hikari types yields fry with a high rate of light expression. Select and fix by the extent of the body-line lustre.
- Health & Cautions
- The hikari body type has symmetrical dorsal and anal fins and a tail spreading both ways. Quality is judged by the extent of the lustre.
About Hikari (Light Body)
Hikari medaka have matching dorsal and anal fins and a silvery-white to bluish sheen on the scales of the back. Many lines come from Miyuki crosses, and they're hardy, best enjoyed from above, and approachable for beginners.
7 things to know before welcoming a Hikari (Light Body)
1Where the Shine Appears
Hikari medaka are known for reflective scales along the back, and quality is judged by how far the shine extends beyond the body. The shine is hard to judge in fry, so watching it develop as the fish matures is part of the enjoyment.
2Matching Dorsal and Anal Fins
The dorsal and anal fins grow to mirror each other in shape, and the tail fin spreads to both sides, which is the defining trait of the type. This symmetry becomes clearer as the fish grows, so it's worth watching the body develop over time.
3Strong, Active Swimmers
Partly due to their fin shape, Hikari medaka tend to swim more actively than typical medaka. A shoal in motion is especially striking, so a roomier tank or water lily pot lets this trait shine.
4Gets Along Well With Others
Hikari medaka are calm-tempered and mix well with other medaka varieties. If you want to preserve the body type or shine line through breeding, separating tanks during spawning season helps.
5Watch for Sudden Water Changes
While rated beginner-friendly, they're sensitive to abrupt shifts in temperature or water quality. Regular water changes and temperature checks keep conditions stable.
6A Lifespan of About 2-3 Years
Hikari medaka typically live around two to three years. Consistent water quality care and season-appropriate feeding help them stay healthy over that span.
7Prepare the Tank Beforehand
Adults grow to roughly 3-4cm, so set up a tank or biotope sized for the number of fish beforehand. Acclimating them slowly to new water reduces stress after arrival.
Frequently asked questions about Hikari (Light Body)
- Q.How is Hikari different from a regular medaka?
- A.The dorsal and anal fins mirror each other in shape and the tail fin spreads to both sides. The scales along the back also take on a metallic sheen from iridophores and shine under sunlight or aquarium lighting. They are best enjoyed when viewed from above.
- Q.Is Hikari medaka suitable for beginners?
- A.Yes, it's rated as beginner-friendly. With basic water changes and temperature management, it's an accessible variety to start with even without special equipment.
- Q.Can Hikari medaka be kept with other varieties?
- A.They're calm-tempered, so mixing with other medaka varieties is generally fine. If you want to preserve a bloodline or body type, separate tanks during breeding season are recommended.
- Q.How large do they grow?
- A.Adults reach roughly 3-4cm in length. It's a good idea to size your tank or biotope with this adult size in mind.
- Q.What is the typical lifespan?
- A.They typically live around two to three years. Careful attention to water quality and temperature helps them stay healthy over that time.
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