Egg Binding (Retained Eggs)
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关于这种疾病
A condition in which a female medaka is unable to release mature eggs normally, causing them to be retained in the abdomen. Contributing factors may include lack of spawning substrate, unsuitable water temperature or quality, and aging.
主要症状
- Noticeably swollen abdomen, sometimes asymmetrical
- Female approaches spawning substrate but fails to deposit eggs over multiple days
- Reduced appetite; fish remains stationary near the surface or bottom
- Abdominal pressure may cause impaired swimming balance
主要原因
- Insufficient or improperly placed spawning substrate (plants, wool mop, etc.)
- Water temperature outside the optimal spawning range (approx. 20–26 °C)
- Decline in reproductive function due to aging or individual constitution
- Suppression of spawning behaviour caused by overcrowding or predation stress
预防（饲养环境与日常护理）
During the breeding season, provide ample spawning substrate such as aquatic plants or spawning mops and keep water temperature within the appropriate range. Maintaining a balanced male-to-female ratio and avoiding overcrowding or sudden water quality fluctuations helps prevent this condition.
相关品种图鉴
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建议几天内咨询专卖店专卖店能做哪些处理？
Specialist aquarium retailers can advise on environmental adjustments to encourage spawning. Aquatic-animal-capable practices, where available, may examine the abdomen and suggest management approaches based on the underlying cause.
相关专栏
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- Recommended Aquatic Plants for Medaka | Choosing for Biotopes and Indoor Aquariums
- Aurora Medaka Care Guide | Tank Setup to Bring Out Rainbow Coloration and Breeding/Selection Tips
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