Reef Fish
Pinnate Batfish
Platax pinnatus · Bony fish — family Ephippidae (batfishes and spadefishes)
The pinnate batfish spends its celebrity early. Juveniles are jet black rimmed in vivid orange, ribbon-thin and taller than long, undulating through the shadows of ledges and silty margins in what is widely interpreted as mimicry of a toxic flatworm; they rank among the most photographed fish in the muck world. Adults trade the costume for silver — a tall, composed schooling batfish of lagoon edges and drop-offs, curious enough to escort divers along a wall. The two stages differ so completely that early naturalists could have described them as separate fish. Finding a juvenile is guide work: they hold tight to dark cover in shallow, protected water and seldom stay long at one site. Bring patience, favor ambient light, and keep the animal between you and its bolt-hole, never cut off from it.
どこで・いつ見られるか
「常駐（Resident）」とは、そのダイビングスポットでのほとんどのダイブで遭遇できることを意味します。「季節限定（Seasonal）」とは、記載された月に確実に見られることを意味します。それ以外の出会いはボーナスであり、計画の前提にはなりません。
| 目的地 | 信頼性 | 月 | メモ |
|---|---|---|---|
| Raja AmpatIndonesia | Resident — seen on most dives | 年間を通じて | |
| Bali & Nusa PenidaIndonesia | Occasional | 年間を通じて | |
| Lembeh StraitIndonesia | Occasional | 年間を通じて | |
| Banda Sea & AmbonIndonesia | Occasional | 年間を通じて | |
| Dumaguete, Dauin & Apo IslandPhilippines | Occasional | 年間を通じて |
ベストな月、一目でわかる
理解を深める
ハビタット: Juveniles hug dark cover in sheltered, often silty shallows — ledges, mangrove edges, wreck shadows; adults school along lagoon and outer-reef drop-offs.
分布域: Western Pacific from the Ryukyu Islands through the Philippines and Indonesia to northern Australia and Melanesia.
生態・行動: Juveniles undulate ribbon-like through shadows in apparent flatworm mimicry; adults are calm, tall-bodied schoolers that sometimes escort divers along a wall for minutes.
食性: Algae, small invertebrates, and jellies; adults graze as well as pick.
サイズ: 目安は 0.3 m; 確認済みの最大記録 0.45 m (total length; juveniles are taller than long, adults disc-shaped).
出会ったときの正しいふるまい方
Shoot juveniles with patience and minimal light — the orange rim overexposes easily — and let the fish keep its shadowed cover rather than herding it into the open.
保全
Not a major fishery species; juveniles are collected for aquaria despite poor survival, and mangrove loss removes nursery habitat.
目撃情報で知られるダイブサイト
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