Reef Fish
Titan Triggerfish
Balistoides viridescens · Bony fish — family Balistidae (triggerfishes); the largest triggerfish on Indo-Pacific reefs
Outside nesting periods a titan triggerfish is simply an impressive reef resident — a heavy, mottled excavator that flips rubble and bites through urchins and branching coral while smaller fish shadow it for scraps. During nesting everything changes. The female guards a shallow pit of eggs at the center of a territory shaped like an inverted cone widening toward the surface, so ascending feels like escape but actually keeps a diver inside the claim. The response drill is unglamorous and effective: level off, turn, and swim horizontally away low over the reef, keeping fins or a camera housing between you and the fish. Bites are not venomous but can pierce a wetsuit and break skin. Give any guarded patch of rubble a wide, flat detour and the drama never starts.
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 |
|---|---|---|---|
| Sharm El Sheikh & Ras MohammedEgypt | Resident — seen on most dives | 年間を通じて | |
| Sipadan & MabulMalaysia | Resident — seen on most dives | 年間を通じて | |
| North & South Malé AtollsMaldives | Resident — seen on most dives | 年間を通じて | |
| KomodoIndonesia | Resident — seen on most dives | 年間を通じて | |
| Cairns & the Ribbon ReefsAustralia | Resident — seen on most dives | 年間を通じて | |
| Similan Islands & Richelieu RockThailand | Resident — seen on most dives | 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: Lagoon and seaward reefs with rubble and sand patches for nest pits; often seen excavating or trailing an entourage of scavenging fish.
分布域: Tropical Indo-Pacific from the Red Sea and East Africa to French Polynesia and southern Japan.
生態・行動: Territorial year-round, dramatically so when nesting; the guarded territory extends upward like an inverted cone above the nest pit, so climbing feels like escape but is not.
食性: Sea urchins, crabs, mollusks, tube worms, and branching coral, flipped and crunched with heavy protruding teeth.
サイズ: 目安は 0.5 m; 確認済みの最大記録 0.75 m (total length).
出会ったときの正しいふるまい方
If charged, level off and swim horizontally away low over the reef, keeping fins or a camera housing between you and the fish; never ascend directly and never corner the animal.
保全
No major targeted fishery; large adults can carry ciguatera and are best left off menus.
目撃情報で知られるダイブサイト
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