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Hector’s dolphins are at risk because they live close to New Zealand’s shores, where fishing nets and other human activities can overlap their habitat. DOC classifies them as nationally vulnerable and estimates 14,849 dolphins older than one year (95% confidence interval: 11,923–18,492). To help, follow fishing and wildlife rules, report sightings to DOC, and put cat faeces in the rubbish rather than flushing them.
“Endangered” describes the conservation concern in the broad sense; it is not Hector’s current New Zealand national category. Hector’s dolphins are endemic to New Zealand and live mostly around the South Island. They are distinct from Māui dolphins, a related subspecies that DOC classifies as nationally critical.
Why are Hector’s dolphins endangered?
Hector’s dolphins face threats in coastal waters, including fishing, disease, boat strikes, tourism, noise, oil and gas exploration, and mining. DOC identifies set-nets as the most significant fishing-related threat. Dolphins can also be caught in trawl nets, although less often than in set-nets.
Fishing mortality matters because Hector’s dolphins reproduce slowly. DOC says females have their first calf at about 5–9 years and produce one calf every 2–4 years. Together, these life-history factors mean population increase is slow, so recovery from added deaths can take time.
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How many Hector’s dolphins are left?
DOC’s current facts page estimates 14,849 Hector’s dolphins older than one year, with a 95% confidence interval of 11,923–18,492. DOC’s species page rounds this to about 15,000. These are estimates, not an exact count of every dolphin alive today.
Hector’s dolphins are commonly observed within seven nautical miles of shore, though Fisheries New Zealand reports research observations out to 20 nautical miles in some locations. Their distribution is not identical everywhere, but their coastal habitat helps explain why fishing measures near shore matter.
What threats affect Hector’s dolphins?
| Threat | What the sources say |
|---|---|
| Set-nets | DOC identifies set-nets as the most significant fishing-related threat to Hector’s and Māui dolphins. |
| Trawl nets | Hector’s dolphins are caught in trawl nets, less often than in set-nets. |
| Toxoplasmosis and other diseases | DOC identifies toxoplasmosis, associated with cats, and other diseases as threats. |
| Other human activity | DOC also lists oil and gas exploration, boat strikes, mining, tourism, and noise. The sources do not quantify the current impact of each. |
DOC’s Threat Management Plan page states: “Set-nets are the most significant fishing-related threat to Hector’s and Māui dolphin.” This is an agency statement about fishing-related threats; it does not mean other threats are absent or that all of them have been quantified.
What is New Zealand doing to protect Hector’s dolphins?
DOC and Fisheries New Zealand jointly lead the Threat Management Plan. DOC manages dolphin populations and non-fishing threats, while Fisheries New Zealand manages fishing impacts.
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Measures introduced in the 2020 review included restrictions on commercial and recreational set-net fishing and commercial trawl fishing in specified coastal areas. The review also prohibited drift-netting in New Zealand waters and varied five marine mammal sanctuaries and the Kaikōura Whale Sanctuary. These measures reduce specified risks but do not eliminate every threat.
New Zealand Ministry for the Environment data reported between zero and five commercial bycatch deaths per year from 2019/20, except for 15 reported deaths in 2023/24. All 15 reported deaths that year were on the east coast of the South Island. These are reported commercial bycatch deaths, not a complete estimate of all dolphin mortality.
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What can I do to help Hector’s dolphins?
- Put cat faeces in the rubbish, not the toilet. DOC explains that the cat-associated parasite that causes toxoplasmosis can reach the sea through streams and stormwater. Correct disposal helps reduce this route; the available sources do not quantify the effect of one household’s action on dolphin survival.
- Report dolphin sightings to DOC. Use DOC’s current reporting guidance so sightings can contribute to its monitoring and conservation work.
- Follow local wildlife and boating rules. Give dolphins space and follow current official guidance when you encounter them. Check local requirements before choosing a tour or taking a vessel out.
- Support measures that address documented threats. Fishing restrictions target fishing mortality, while cat-waste guidance addresses a route for toxoplasmosis contamination. The supplied sources do not provide a unified comparison of the effectiveness of all protections.
Are Hector’s dolphins the same as Māui dolphins?
No. Māui dolphins are a related subspecies, not the same population as Hector’s dolphins. DOC classifies Māui dolphins as nationally critical and Hector’s dolphins as nationally vulnerable, so their classifications and population estimates should not be treated as interchangeable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Are Hector’s dolphins officially endangered in New Zealand?
No. DOC’s current New Zealand classification is nationally vulnerable. “Endangered” in the title refers broadly to conservation risk, not the current national category.
What is the biggest fishing threat to Hector’s dolphins?
DOC identifies set-nets as the most significant fishing-related threat. Dolphins are also caught in trawl nets, but less often.
How can cat waste affect Hector’s dolphins?
DOC says the parasite associated with cats can reach the sea through streams and stormwater. Its public guidance is to put cat faeces in the rubbish rather than flushing them.
Why might recovery take a long time?
DOC reports that females have their first calf at about 5–9 years and produce one calf every 2–4 years. DOC says the combined life-history factors mean population increase is slow.
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