ジャワメダカ (Oryzias javanicus)

科: Adrianichthyidae

ジャワメダカは東南アジア（インドネシア、マレーシア、シンガポール）に原生する温和な雑食性の淡水魚（アドリアニクチス科）。飼育難度は初心者向き程度です。

飼育条件

水温: 22–25 °C
pH: 7.5–8.5
GH硬度: 5–15 dGH
成魚の体長: 3.1–4.5 cm
最小水槽: 45 L
泳ぐ水層: Upper; surface-oriented; keep 6+
飼育難度: 簡単
性格: Peaceful
原産地: 东南亚（印度尼西亚、马来西亚、新加坡）

種の概要

Oryzias javanicus of the family Adrianichthyidae is an aquarium-kept Adrianichthyidae. Peaceful and omnivore; quality prepared foods with variety, it grows to 3.1–4.5 cm and prefers 22–25 °C water. Other Oryzias species in our database include Oryzias curvinotus, Oryzias latipes, Oryzias sinensis.

原生環境

生息地: Clear streams, rivers and still waters
水流: Still to very gentle water
溶存酸素: Average oxygen needs

レイアウトと設備

底床: Dark fine gravel or sand
流木・石組: Driftwood, water-worn stones and shelters that mimic the native biotope
水草: Dense floating plants for cover and security

性格・餌・混泳

群泳性: Keep 6+; larger groups settle better
餌: Omnivore; quality prepared foods with variety
おすすめの混泳相手: Amur False Gudgeon — Similar size and water needs
Striped Bitterling — Similar size and water needs
Acheilognathus gracilis — Similar size and water needs
混泳しないほうがいい相手: Large aggressive cichlids — Bullying and injury risk
Known fin nippers — Constant stress and fin damage

繁殖と注意点

雌雄の違い: Males are typically slimmer and more intensely colored; females fuller-bodied
繁殖方法: Egg-scatterer over fine plants; condition with rich foods and simulate seasonal changes

よくある質問

ジャワメダカは飼育しやすい？

難易度：簡単。Peaceful。

ジャワメダカの適水温と水質は？

22–25 °C を安定して維持。pH 7.5–8.5、GH 5–15 dGH。

ジャワメダカの大きさと水槽サイズは？

成魚は約 3.1–4.5 cm。Upper; surface-oriented; keep 6+。最小 45 L の水槽。

ジャワメダカの餌は？

Omnivore; quality prepared foods with variety。Dark fine gravel or sand上で採餌する性質を活かし、沈む餌も与える。

ジャワメダカは混泳できる？

Peaceful。混泳の相手：Amur False Gudgeon — Similar size and water needs, Striped Bitterling — Similar size and water needs, Acheilognathus gracilis — Similar size and water needs。Large aggressive cichlids — Bullying and injury risk, Known fin nippers — Constant stress and fin damageは避ける。

ジャワメダカの原産地は？

东南亚（印度尼西亚、马来西亚、新加坡）のClear streams, rivers and still watersが生息地。

ジャワメダカは飛び出す？

リスクは低いが、ふたがあると安心。

ジャワメダカの繁殖は？

繁殖：Egg-scatterer over fine plants; condition with rich foods and simulate seasonal changes。Males are typically slimmer and more intensely colored; females fuller-bodied。