For immediate release: 23 February 2014
Poor Government Science Is Letting Down New Zealand’s Dolphins
Despite strong criticism from the world’s leading scientific organisations, the New Zealand government maintains that
Maui’s and Hector’s dolphins are adequately protected against fishing. However, information published by the Department
of Conservation (DOC) does not support this view. NABU International is alarmed at the lack of consistency, scientific
rigour and accountability in the government’s management of Hector’s and Maui’s dolphins and disputes the validity of a
new estimate of 9,100 Hector’s dolphins off the East Coast South Island.
Maui’s dolphins are amongst the rarest wild animals on earth. Forty years ago there used to be around 1,800 Maui’s
dolphins. Today, there are less than 50. Gillnet and trawl fishing persists across most of the dolphins’ habitat, kills
about five individuals a year and will lead to extinction by 2030.
“Every conceivable international scientific body has urged the government to fully protect Maui’s dolphin habitat to
secure the dolphins’ survival”, says Dr. Barbara Maas, NABU International’s Head of Endangered Species Conservation.
“This is not the kind of thing that happens every day. Yet, the government simply dismissed this advice and turned to
its own officials for support instead – a weak attempt to add credibility to an untenable position that will prove fatal
for New Zealand’s only native dolphin.”
The argument centres around disagreement over the dolphins’ distribution. Both Maui’s and the closely related Hector’s
dolphins range to a water depth of 100 meters and occasionally beyond. The Department of Conservation (DOC) accepts
this water depth as the offshore boundary for both subspecies. The Ministry of Primary Industries (MPI) too accepts the
100m depth contour as an offshore boundary for Hector’s, but not for Maui’s dolphins.
“Instead of applying a consistent and biologically judicious approach, MPI has created a patchwork of fisheries
exclusion zones that reflects industry priorities rather than dolphin distribution. Boundaries for gillnetting are set
at two or seven nautical miles offshore, while protection from trawling only extends to two or four 4 nautical miles.
This simply makes no sense.”
As recently as 2012, DOC had argued in favour of protecting Maui’s dolphins to the extremes of their range as a
prerequisite for their recovery, criticizing the less wide-ranging fisheries restrictions that are now in place as
“inadequate” and not representative of “the best available information on the dolphins’ biology”. Then, as now, DOC
records include confirmed Maui’s dolphin sightings well beyond the boundaries of current fishing restrictions, which are
simply ignored by MPI.
Last week DOC and MPI came out in support of the Government’s decision not to afford the dolphins better protection. At
the same time, the government announced a new estimate of 9,100 Hector’s dolphins off the East Coast South Island. It is
based on survey, which is still under review after it had been criticised by experts in New Zealand and overseas.
“One of the problems with the survey is its enormous margin of error, which ranges from 3,000 to 30 million dolphins.
Discrepancies of such magnitude are unheard of for surveys of this nature and signify serious technical flaws.
Statements about the number of dolphins off the East Coast South Island are therefore premature. It appears that the
problem may have been caused by the way the survey was conducted, so it may even have to be repeated. At a cost of some
$800,000, this would be an expensive mistake and hardly “great news”.”
“While Maui’s dolphin numbers are declining rapidly, the government is spending its resources on a poorly designed study
that is biased towards inflated numbers. These funds could have been used more constructively to help fishermen adopt
alternative sources of income that don’t kill endangered dolphins.”
“Maui’s and Hector’s dolphin management is in a mess, and the fact that government officials support a decision made by
their Ministers is a non-event” says Dr Maas. “What’s important is that Maui’s and Hector’s dolphin protection should
be based on the best available information and credible and accurate science. Until that happens, New Zealand’s
forgotten dolphins don’t stand a chance.”