Sharks
Whale Shark
Rhincodon typus · Cartilaginous fish — family Rhincodontidae
Nothing else in diving prepares you for the first sight of a whale shark: a checkerboard of pale spots on slate-blue flanks resolving out of the haze, a meter-wide mouth pushed along at strolling pace. The largest fish on Earth is a plankton eater that behaves, around people, with almost complete indifference. Encounters are mostly surface snorkels above feeding animals, so the classic view is down the length of a huge, gently sculling body silhouetted against sunlight. Every individual carries a unique spot pattern, which is why photo-ID libraries built from tourist pictures underpin much of what science knows about their movements.
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 |
|---|---|---|---|
| Ari AtollMaldives | Resident — seen on most dives | Year-round | |
| Galápagos IslandsEcuador | Seasonal — reliable in season | Jun–Nov | |
| Isla Mujeres & CancúnMexico | Seasonal — reliable in season | Jun–Sep | |
| Ningaloo ReefAustralia | Seasonal — reliable in season | Mar–Jul | |
| Mafia IslandTanzania | Seasonal — reliable in season | Oct–Feb | |
| Tofo BeachMozambique | Seasonal — reliable in season | Oct–Mar | |
| Similan Islands & Richelieu RockThailand | Occasional | Feb–Apr |
ベストな月、一目でわかる
| 月 | 安定して出会える目的地 |
|---|---|
| January | Ari Atoll · Mafia Island · Tofo Beach |
| February | Ari Atoll · Mafia Island · Tofo Beach · Similan Islands & Richelieu Rock |
| March | Ari Atoll · Ningaloo Reef · Tofo Beach · Similan Islands & Richelieu Rock |
| April | Ari Atoll · Ningaloo Reef · Similan Islands & Richelieu Rock |
| May | Ari Atoll · Ningaloo Reef |
| June | Ari Atoll · Galápagos Islands · Isla Mujeres & Cancún · Ningaloo Reef |
| July | Ari Atoll · Galápagos Islands · Isla Mujeres & Cancún · Ningaloo Reef |
| August | Ari Atoll · Galápagos Islands · Isla Mujeres & Cancún |
| September | Ari Atoll · Galápagos Islands · Isla Mujeres & Cancún |
| October | Ari Atoll · Galápagos Islands · Mafia Island · Tofo Beach |
| November | Ari Atoll · Galápagos Islands · Mafia Island · Tofo Beach |
| December | Ari Atoll · Mafia Island · Tofo Beach |
理解を深める
ハビタット: Open ocean and productive coastal waters; feeds at the surface over plankton blooms and spawning events, though tagged animals dive far below 1,000 m
分布域: Circumtropical in warm seas, roughly between 30°N and 35°S, with predictable coastal feeding aggregations off Australia, Mexico, the Maldives, Tanzania, Mozambique, and the Philippines
生態・行動: A slow, steady swimmer that tolerates snorkelers well when not crowded. Feeding animals track plankton at the surface, sometimes bobbing vertically to gulp concentrated prey. Most aggregation sites are dominated by juvenile males; where the giant pregnant females go remains only partly understood.
食性: Filter feeder — plankton, krill, fish eggs, and small baitfish strained through gill rakers while ram-feeding or vertical suction-feeding
サイズ: 目安は 9.0 m; 確認済みの最大記録 18.0 m (total length; most encountered animals are 4–10 m juveniles and subadults, with reliable records approaching 18 m).
出会ったときの正しいふるまい方
Snorkel-only at most managed sites. Keep roughly 3 m from the body and 4 m from the tail, never touch or ride, no flash close to the eye, stay out of its path, and let the operator control entries. Touching bans and distance rules are written into regulations at Ningaloo, Isla Mujeres, and Hanifaru.
保全
Listed Endangered in 2016 after steep Indo-Pacific declines driven by fisheries and ship strikes. Well-run tourism now gives living whale sharks measurable economic value, but crowding and propeller injuries at hotspots are real concerns.
目撃情報で知られるダイブサイト
動画を見る
公式チャンネルより
Best Places to Dive with Whale Sharks
Outrageously Tiny Fish
Sink or Swim? with Monét X Change | Monterey Bay Aquarium
動画はクリエイター自身のチャンネルへの埋め込みリンクです。当サイトはコンテンツをホストせず、すべての出典を明示しています。