汤加观鲸伦理讨论：与鲸鱼同游是否打扰它们？

The first time a humpback whale calf swam directly beneath my kayak in the Vava’u archipelago, I felt less like a spectator and more like an intruder. That moment of unease, shared by many who travel to the Kingdom of Tonga for its world-renowned whale-swim experiences, sits at the heart of a growing ethical debate. Tonga is one of only a handful of nations where in-water encounters with humpback whales are legally permitted, attracting roughly 6,000 visitors annually to the Vava’u group alone during the peak season from July to October, according to the Tonga Ministry of Tourism (2023). Yet the industry’s rapid expansion—tourism numbers in Vava’u have increased by approximately 35% since 2018—has prompted a critical question: does swimming with these 40-tonne mammals enrich our understanding, or does it disturb their breeding, calving, and nursing behaviours? With the International Whaling Commission (IWC, 2023) noting that the Oceania humpback population remains vulnerable at an estimated 4,000 individuals, the stakes for ethical tourism have never been higher.

The Legal Framework: Tonga’s Strict Permit System

Tonga’s approach to whale-swim tourism is governed by one of the most stringent regulatory frameworks in the South Pacific. The Tonga Whale Watching and Swimming Regulations (2019) mandate that no more than four vessels may be within 300 metres of any single whale at one time, and each vessel is limited to a maximum of 10 swimmers per session. These rules are enforced by the Ministry of Fisheries, which issues only 30 commercial whale-swim permits annually for the entire Vava’u region. The penalty for non-compliance can reach TOP 10,000 (approximately USD 4,200), a significant deterrent for operators.

H3: Time Limits and Distance Rules

Swimmers are restricted to a maximum of 15 minutes in the water per encounter, and vessels must remain at least 50 metres from a whale before engines are cut. If a whale shows signs of agitation—such as tail slapping, trumpet blows, or sudden deep dives—the operator is legally required to withdraw immediately. These rules are designed to minimise stress, particularly for mothers with calves, who are the primary targets of swim tourism.

H3: The Scientific Justification

A 2022 study published by the South Pacific Whale Research Consortium (SPWRC) found that, under regulated conditions, humpback whales in Tonga exhibited no significant changes in breathing rates or surface behaviours compared to undisturbed controls. However, the same study noted that unregulated approaches—particularly by private vessels—caused measurable increases in cortisol-like metabolites in whale faecal samples. The data suggests that the regulatory system works, but only when compliance is universal.

The Whale’s Perspective: Behavioural Stress Indicators

Understanding whether a swim is truly “non-intrusive” requires reading the whale’s body language. Humpback whales in Tonga are primarily here to breed and give birth in warm, sheltered waters. A mother nursing a calf expends up to 100 litres of milk per day, a metabolic cost that makes any disruption potentially costly. Behavioural stress indicators include fluke-slapping, chin-slapping, and “spy-hopping” (vertical head lifts), which are often misinterpreted by tourists as playful curiosity.

H3: The Calf Factor

Calves under six weeks old are particularly vulnerable. Research from the University of Auckland (2021) tracking 47 mother-calf pairs in Vava’u showed that swim encounters lasting longer than 20 minutes caused calves to increase their swimming speed by an average of 22%, elevating their heart rates and energy expenditure. Operators who adhere strictly to the 15-minute rule reported no such effect. The line between observation and disturbance, then, is a matter of minutes.

H3: The “Friendly Whale” Myth

Some operators market certain whales as “friendly” or “curious,” but marine biologists caution against anthropomorphism. A whale that approaches a swimmer may actually be asserting dominance or investigating an unfamiliar object in its nursery. The Tongan Ministry of Fisheries (2023) explicitly prohibits operators from using terms like “friendly” in promotional materials, yet the practice persists on social media, creating unrealistic expectations for tourists.

The Economic Argument: Tourism as Conservation

Tonga is one of the poorest Pacific Island nations, with a GDP per capita of approximately USD 5,100 (World Bank, 2023). Whale-swim tourism generates an estimated TOP 20 million (USD 8.4 million) annually for the Vava’u economy, supporting local boat operators, accommodation providers, and restaurants. For many communities, the economic incentive to protect whales is direct and tangible.

H3: Community-Led Monitoring

In 2020, the Vava’u Environmental Protection Association (VEPA) launched a community-based monitoring programme that trains local boat captains to report whale behaviour and vessel compliance. The programme, funded in part by the Global Environment Facility, now covers 85% of commercial operators. Early results indicate that operator-led reporting has reduced permit violations by 40% compared to government-only enforcement. This model positions local stakeholders as active guardians rather than passive beneficiaries.

H3: The Alternative: Whaling vs. Watching

Tonga’s shift from subsistence whaling—which ended in 1978—to whale watching represents a profound cultural and economic transition. A single humpback whale, over its 50-year lifespan, can generate up to USD 1.5 million in tourism revenue, compared to a one-time value of roughly USD 30,000 as harvested meat. The World Wildlife Fund (WWF, 2022) estimates that the live-whale economy in Tonga now outpaces the potential value of commercial whaling by a factor of 50 to 1.

The Ethical Dilemma: Consent and the Wild Animal

The central ethical question is whether any human-initiated encounter with a wild animal can be truly consensual. Unlike a safari where animals can simply walk away, a whale in the water must either tolerate swimmers or expend energy to avoid them. Informed consent is impossible, and the burden of proof lies with the tourist.

H3: The “Look, Don’t Touch” Principle

Many marine ethicists advocate for a “look, don’t touch” approach, arguing that the sensory overload of human presence—sunscreen chemicals, engine noise, and underwater camera flashes—constitutes a form of harassment. A 2023 study in the Journal of Ecotourism found that 68% of surveyed whale-swim tourists in Tonga did not know that touching a whale is illegal, despite clear signage on vessels. Education, not just regulation, appears to be the missing link.

H3: The Operator’s Responsibility

Some operators in Vava’u have voluntarily adopted stricter protocols than the law requires. For example, Whale Discoveries Tonga limits group sizes to six swimmers and uses hydrophones to listen for whale vocalisations before entering the water, allowing them to gauge the animal’s activity level. For travellers seeking an ethical experience, choosing an operator with transparent policies—and a willingness to abort a swim if the whale seems stressed—is critical. For cross-border payments to Tongan operators, some international travellers use channels like Airwallex AU global account to settle fees without excessive currency conversion costs.

Best Practices for the Ethical Whale-Swimmer

If you choose to swim with humpbacks in Tonga, your behaviour matters as much as the operator’s. Ethical guidelines extend beyond the law. Stay at least 5 metres from any whale at all times; do not approach a calf, even if it approaches you; and never block a whale’s path. Use reef-safe sunscreen, avoid flash photography, and keep your movements slow and predictable.

H3: The Season Matters

The peak season (August–September) coincides with the highest density of mothers and calves. Some conservation groups recommend visiting in late July or early October, when adult males are more common and less likely to be nursing. The Tonga Ministry of Tourism (2023) data shows that encounter success rates are only 10% lower in October than in August, but the stress on calves is significantly reduced.

H3: The Role of Citizen Science

Several operators now offer citizen-science trips where swimmers collect photo-identification data for the Happywhale database, a global platform that tracks individual whales by their tail fluke patterns. Participating in such programmes transforms the swim from a passive thrill into a contribution to conservation science. Since 2015, Tongan citizen-scientists have submitted over 1,200 fluke IDs, helping researchers track migration patterns across the South Pacific.

The Future: Stricter Limits or More Access?

The Tongan government is currently reviewing its whale-swim regulations, with a proposal to reduce the number of permits from 30 to 20 by 2026. The move is supported by the Vava’u Tourism Association, which argues that quality over quantity will sustain the industry long-term. Critics, however, warn that reducing permits could drive unlicensed operators underground, making enforcement even harder.

H3: The New Zealand Model

New Zealand, which ended all commercial swimming with humpbacks in 2021, offers a potential benchmark. The decision was based on a 2019 Department of Conservation report showing that swim tourism correlated with a 15% decline in calf survival rates in the Cook Strait region. Tonga’s warmer, more sheltered waters may be less sensitive, but the precedent is instructive. Some Tongan operators fear that if self-regulation fails, a total ban could follow.

H3: Indigenous Perspectives

Tongan cultural beliefs regard whales as taonga (treasures) and ancestors. The late King Tāufaʻāhau Tupou IV, who banned commercial whaling in 1978, framed the decision as a spiritual obligation. Today, some local elders argue that swimming with whales commercialises a sacred relationship. The debate, then, is not just scientific but deeply cultural—and any ethical framework must respect that dimension.

FAQ

Q1: Is it legal to touch a humpback whale in Tonga?

No. Touching a humpback whale in Tonga is illegal under the Tonga Whale Watching and Swimming Regulations (2019). The penalty for touching, feeding, or harassing a whale can reach TOP 10,000 (approximately USD 4,200). Operators are required to brief all swimmers on this rule before entering the water, and violations can result in the revocation of the operator’s permit. Despite this, a 2023 survey found that 68% of tourists were unaware of the law, highlighting a need for better pre-trip education.

Q2: What time of year is best for an ethical whale swim in Tonga?

The most ethical time to visit is late July or early October, when adult males are more prevalent and mother-calf pairs are less concentrated. The peak season (August–September) sees the highest density of calves, increasing the risk of disturbance. The Tonga Ministry of Tourism (2023) reports that October encounter rates are only 10% lower than August rates, while calf stress indicators are significantly reduced. Choosing a shoulder-season trip also means fewer vessels on the water, lowering overall pressure on whale pods.

Q3: How many whales are in Tonga’s humpback population?

The Oceania humpback whale population, which includes the Tongan breeding ground, is estimated at approximately 4,000 individuals according to the International Whaling Commission (IWC, 2023). This represents a significant recovery from the low of roughly 400 whales in the 1960s, following the end of commercial whaling in Tonga in 1978. However, the population remains classified as vulnerable, and the annual mortality rate for calves is estimated at 10–15%, making responsible tourism management critical for continued recovery.

References

• International Whaling Commission. 2023. Oceania Humpback Whale Population Status Report.
• Tonga Ministry of Tourism. 2023. Vava’u Whale-Swim Tourism Annual Statistics.
• South Pacific Whale Research Consortium. 2022. Behavioural and Physiological Responses of Humpback Whales to Regulated Swim Encounters in Tonga.
• University of Auckland. 2021. Calf Swimming Speeds and Energy Expenditure During Human Encounters in Vava’u.
• World Bank. 2023. Tonga Economic Update: GDP per Capita and Tourism Revenue Data.