The waters off Okinawa are buzzing these days — but not with the kind of energy you'd associate with the crystal-blue Kerama Islands. We're talking about five or six tour boats surrounding a single humpback whale (written「座頭鯨／ザトウクジラ」in Japanese; the Taiwan Cetacean Society prefers "大翅鯨," literally "large-finned whale") and blasting away with cameras. On 6 May 2026, Japan's TV Asahi morning programme Good Morning! ran a hard-hitting feature on how Okinawa's whale-watching operators had ballooned from 4 to 51 in just ten years, visitor numbers tripling from 10,000 to 30,000, and mother-calf pairs being driven into deep dives to escape flotillas of boats. Watching the report, the Editor couldn't help thinking: this is the perfect negative case study in sustainable diving. This piece starts with the incident and then lays out three concrete red lines for ocean-friendly travel — distance, group size, and behaviour. Read to the end, and ask yourself whether, on your next swim-with encounter, whale-watching trip, or sea-turtle dive, you'll be standing on the right side of those lines.
A humpback whale drifts slowly through the water — a familiar sight off Okinawa in the transition from winter to spring. Photo by Oliver Tsappis on Unsplash
What's Clogging the Waters Off Okinawa? Operators Jump from 4 to 51, and the Whales Are Scared
This all unfolded during the winter-to-spring transition of 2026. TV Asahi trained its cameras on Naha Harbour — queues of tourists boarding boats, then a cut to five or six sightseeing vessels encircling a humpback whale at sea. The whale surfaced to breathe, was startled within seconds, and plunged back down. What the cameras captured wasn't nature — it was gridlock.
The Numbers Don't Lie: 4 Operators to 51, Visitors from 10,000 to 30,000
The figures in the report are sobering. Ten years ago Okinawa had just 4 whale-watching operators; today there are 51. Visitor numbers have climbed from around 10,000 to roughly 30,000. Boats have multiplied twelvefold, visitors threefold — but the number of whales has not kept pace. On days when sightings are scarce, 5 to 6 boats converge on the same animal. The image that sprang to the Editor's mind: a limited-edition concert ticket scramble, whale edition.
Okinawa currently has four whale-watching associations that have drawn up voluntary codes of conduct. Tour boats are in principle required to maintain a distance of at least 100 metres from whales; observations of mother-calf pairs are capped at one hour; and some operators in the north have even suspended "swim-with-whale" programmes of their own accord. That sounds responsible enough — but how many of those 51 operators are actually complying? Who is enforcing the rules? Does having 5 or 6 boats squeezed in just outside 100 metres really count as compliance? The Editor's one burning question after watching the report: if a voluntary code exists only on a webpage and there's no one blowing a whistle on the water, can it possibly keep pace with an industry that's growing this fast?
A mother whale swims alongside her newborn calf. Every time a vessel startles her into a deep dive, it's a debit from the calf's milk account. Photo by Jonathan Hsu on Unsplash
What a Whale's Fear Looks Like: The Mother Whale's Energy Budget, Explained
The detail that hit the Editor hardest in the report was this: both skippers and researchers have noticed the whales are becoming afraid of boats. The moment a vessel approaches, the whale dives deep; the calm, stationary rest-float at the surface turns into a rapid, evasive descent. For a 15-metre-long animal, that picture is deeply wrong. Humpback whales resting motionless at the surface is their default behaviour during their time in Okinawa — and boats driving them into emergency dives is the equivalent of hauling someone off the sofa and ordering them to sprint 100 metres. For you or me, inconvenient. For a mother whale that has just given birth, it's something else entirely.
During the roughly three months humpbacks spend in Okinawa, they barely eat. They are running entirely on fat reserves built up over the summer feeding season in Alaskan waters, slowly converting those reserves into milk for their newborn calves. Every unnecessary deep dive, every panicked sprint during this period, draws down the calf's milk supply. The report makes one point crystal clear: whether a calf can successfully accompany its mother back north to Alaska depends directly on how well it is fed during those months in Okinawa. In other words, the moment your boat frightens a mother whale into fleeing, you may — without ever realising it — be altering the fate of the next generation of humpback whales.
The Editor's Key Takeaways: Three Red Lines for Ocean-Friendly Travel
Right. Now that we've covered the incident, the Editor's message isn't "don't go whale watching in Okinawa." It's about how to turn this case of marine over-tourism into a checklist for your next diving or swim-with booking. Ocean-friendly travel isn't a romantic slogan — it's three very concrete red lines.
Distance Management: A Different Ruler for Every Species
Different species have different comfort zones; there is no single universal measuring tape. Okinawa humpback whales: vessels must stay 100 metres away. Xiaoliuqiu sea turtles: people must stay 5 metres away. Whale Shark swim-withs (e.g. Donsol in the Philippines): 3 metres from the head, 4 metres from the tail. manta ray swim-withs (Manta Trust guidelines): stay 3 metres away, observe cleaning stations from the perimeter.
Why such variation? Because body size, sensory systems, and threat responses differ between species. Humpback whales are sensitive to engine noise and propeller wash, so the buffer needs to be large. Sea turtles fear being surrounded and cut off — 5 metres is just enough to leave an escape route. Whale Sharks are large but slow-moving; 3 metres gives the tail fin room to swing without striking a swimmer. The Editor's practical advice: before every dive site visit, ask the local operator what the legal or recommended distance is for the species you'll encounter. If they can't answer, find a different operator.
Group-Size Limits: Caps Aren't About Blocking Revenue
The second red line is headcount. The fundamental problem in Okinawa right now is too many boats in the same place at the same time. The Editor has come across overseas operators who take only 6 people into the water per group; some Naha whale-watching vessels carry 40 to 60 passengers at a time. Which is more respectful of the whales? The answer isn't really about boat size — it's about whether operators are willing to wait. Willing to wait for the next whale to appear. Willing to give up a photo position. Willing to cut the engine and drift. That is what a genuine group-size cap looks like in practice. If the operator you're booking keeps saying "guaranteed whale sighting" or "full-capacity departures," the Editor's advice is to move on. The ability to guarantee a sighting isn't the operator's skill — it's the price being charged, and right now the whales are the ones paying it.
Behavioural Rules: Don't Chase, Don't Block, Don't Surround, Don't Touch
The third red line is behaviour. Taiwan's own Xiaoliuqiu has actually set a fine example here with its Five Prohibitions: no chasing, no harassment, no touching, no feeding, no harming. The international Green Fins standard (launched jointly by UNEP and the Reef-World Foundation, with PADI as a global partner) spells out the same principles — don't chase, don't touch, don't feed, maintain distance and give space — which aligns perfectly with Xiaoliuqiu's approach. Green Fins does not specify exact distances; those are left to individual species guidelines and local regulations.
One sentence sums it all up: let the animal decide whether it wants to approach you. You have entered its home. If it doesn't want to see you, you owe it respect. The problem in Okinawa is that boats are intercepting the whales' travel paths — that is no longer observation; it is encirclement. The Editor will say it plainly: encirclement-style whale watching is wrong, regardless of which country it happens in and regardless of whatever justification the operator offers.
Not Just Okinawa: Lessons from Xiaoliuqiu's Sea Turtles and International Guidelines
If you think this is purely a Japanese problem, the Editor suggests you look closer to home. Ten years ago, Xiaoliuqiu was a word-of-mouth diving secret known only to a small circle; today it's a tourist hot spot marketed as "guaranteed sea turtle sightings." That transformation happened at roughly the same speed as Okinawa's. Once "guaranteed sighting" becomes a marketing tagline, operators start chasing volume — and so snorkelling groups cycle in and out from morning to night, with sea turtles near Vase Rock and Lobster Cave being surrounded on all sides. The Editor has visited several times; the most visceral memory is of a snorkeller's fins less than 2 metres from a turtle's face, and someone reaching out to touch its shell, while the operator on shore shouted warnings that couldn't carry underwater.
Taiwan actually has the right regulations in place. Pingtung County and civil society groups jointly promote the 5-metre rule and the Five Prohibitions. Touching or harassing a sea turtle falls under Article 42 of the Wildlife Conservation Act, carrying fines of NT$60,000 to NT$300,000 or up to one year's imprisonment. Any ocean-minded citizen who witnesses a violation can photograph it and file a report. Taiwan isn't short on laws — what it's short on is people willing to enforce them on the spot. The TV Asahi report is ultimately a warning to Taiwanese operators: once "guaranteed sightings" become widely accepted by the market, ecological pressure rises exponentially and red lines get crossed one by one.
Let the animal decide whether it wants to approach you — that is the shared spirit behind international guidelines. Photo by Chinh Le Duc on Unsplash
For divers who want to be genuinely responsible, the Editor recommends keeping a few international standards in mind — a checklist you can apply every time you pick a dive shop or book a trip. Green Fins was launched in 2004 by the United Nations Environment Programme (UNEP) and the UK's Reef-World Foundation, with Reef-World serving as international coordinator and PADI joining as a global partner in 2018. Its 15 Icons don't just regulate divers — they regulate the dive shop itself: briefing content, waste management, fuel-spill procedures, and wildlife interaction principles (no chasing, no touching, no feeding, give space — no specific distances stipulated). Next time you're choosing a dive shop, check whether it's a Green Fins Member. That tells you whether it's willing to be held to an international standard.
Whale Shark swim-withs: if you're planning to swim with Whale Sharks in Donsol in the Philippines or La Paz in Mexico, remember two numbers: minimum 3 metres from the head, minimum 4 metres from the tail. No fins (to prevent kicking the Whale Shark), no flash photography, never block its path. Donsol now has dive guides who blow whistles underwater to stop violations.
manta ray swim-withs: the Manta Trust has published a sustainable tourism guide at swimwithmantas.org, distilling responsible manta ray encounters into 10 steps — from how to enter the water, to maintaining a 3-metre distance, to observing cleaning stations from the perimeter rather than diving into them, to never approaching from above, to never chasing. The Editor has previously written a full breakdown: How to Swim with Manta Rays the Right Way — The Manta Trust's 10-Step Code. Highly recommended reading before your next swim-with trip.
These guidelines, taken together, are really saying one thing: make the ocean a place animals are willing to return to year after year. When you respect distances, group limits, and behavioural rules today, that stretch of sea still has something to show you next year.
The Editor's Note: Be the Diver the Ocean Is Happy to See Again
Before wrapping up, the Editor wants to be candid about something. Ocean-friendly travel can sound like conservationist rhetoric, but for us as divers it is intensely practical. Whether we ever see that sea turtle again, that Whale Shark, that squadron of manta rays — depends entirely on how we treat them today. Among Okinawa's 51 operators, some will lose money, some will fold. But the far grimmer scenario is the one where the whales decide to stop coming to these waters to raise their young, and the entire industry disappears with them.
The joy of being a diver lies not in "what I saw" but in "whether the ocean is still willing to show me." The next time you book a liveaboard, sign up for a snorkelling group, or reserve a swim-with slot, ask the operator three questions on the Editor's behalf: What are your distance guidelines? How many people per group? And if the animal wants to leave, will you let it go? Only when all three answers are right should you confirm the booking.
Sources
- TV Asahi Good Morning!, broadcast 6 May 2026: YouTube link
- Soso Japan (SSJP) Chinese summary: Okinawa Whale-Watching Boom Causes "Marine Over-Tourism" — Humpback Whale Behaviour Shows Signs of Change
- Green Fins / Reef-World Foundation (via PADI Pros Blog): The Reef-World Foundation's Green Fins Code of Conduct
- Manta Trust "How to Swim with Mantas" 10-step guide: swimwithmantas.org
- Xiaoliuqiu sea turtle Five Prohibitions and Wildlife Conservation Act Article 42 regulatory summary (compiled from Pingtung County Government and civil society sources)
