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| What's New?/Hectors Dolphin |
last updated 3 September 2007 |
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| The Problem |
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Hectors dolphins are found only in New Zealand. The species as
a whole numbers fewer than 8,000 individuals. That is down from more
than 29,000 in 1970. The decline was caused by dolphins being caught
and drowned in gillnets used by commercial and recreational fishers.
North Island Hectors dolphins, also known as Mauis dolphins,
have been worst affected. With a population size of about 100 individuals
they are critically endangered. |
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The Solution |
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This problem can be solved simply and effectively by ensuring that
only selective fishing methods are used in areas where Hectors
dolphins are found.
In particular, in waters less than 100m deep: |
- Use only fishing methods that dont catch
dolphins
- Replace gillnets and trawling with selective, sustainable fishing methods
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| What's been done so far? |
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New protection measures for Hector's dolphins are due to be implemented on 1 October. These involve banning gillnet and trawl fisheries in some areas where Hector's dolphins are found.
The proposed measures are a major step forward. However, they are not sufficient to allow population recovery and do not yet meet national or international guidelines for marine mammal protection.
Specific ways in which protection could be improved include:
- Protection from gillnetting off Taranaki to allow the North Island Hector’s dolphin (also known as Maui's dolphin) to recover
- Better protection of harbours. The proposed measures provide protection in North Island harbour entrances, but most of the harbour habitat is still open to gillnetting. Likewise, Hector’s dolphins in Banks Peninsula harbours are still exposed to gillnet fisheries
- Extending protection on the west coast South Island to to 6 nautical miles offshore, year-round
- Extending protection at Banks Peninsula area offshore to 15 nautical miles as Hector's dolphins are found well beyond the 4 nautical mile protection boundary in this relatively shallow area
- Increased protection from trawl fisheries
- Observers on all gillnet and trawl fisheries continuing in areas where Hector’s dolphins are found
For more information, please click here |
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| What you can do to help |
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Please send a letter to the Ministers of Fisheries and Conservation
Please send your comments on how the protection measures could be improved to:
Jim Anderton, Minister of Fisheries: janderton@ministers.govt.nz
Steve Chadwick, Minister of Conservation: schadwick@ministers.govt.nz
Or post a brief letter to: Steve Chadwick and Jim Anderton, Ministers of Conservation and Fisheries, Parliament Buildings, Wellington (no stamp required)
TXT DOLPHIN TO 8080
Send a txt message with the word "dolphin" to the number 8080 (this costs 20 cents). The Whale and Dolphin Conservation Society will forward these messages to the Prime Minister Helen Clark, urging her to put in place effective protection for the dolphins. |
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| For more information
see the following Trust research |
- Slooten E, Dawson S (2008) Effectiveness of new protection measures for Hector’s dolphin. Presented as paper SC/60/SM12 at the Scientific Committee of the International Whaling Commission, Santiago, June 2008.
- Slooten, E., Rayment, W.J. and Dawson, S.M.
Offshore distribution of Hectors dolphins at Banks Peninsula:
Is the Banks Peninsula Marine Mammal Sanctuary large enough?
New Zealand Journal of Marine and Freshwater Research
- Rayment, W., Dawson, S.M., Slooten, E. and
Childerhouse, S.J. Offshore distribution of Hectors dolphin
at Banks Peninsula. Department of Conservation Research
and Development Series, 232, 23 p. (2006)
- Slooten, E., Dawson, S.M., Rayment, W.J.
and Childerhouse, S.J. A new abundance estimate for Mauis
dolphin: What does it mean for managing this critically endangered
species? Biological Conservation 128: 576-581 Available
online 18 November (2005)
- Dawson, S.M. and Slooten, E. Management of
gillnet bycatch of cetaceans in New Zealand. Journal of
Cetacean Research and Management 7: 59-64 (2005)
- Slooten, E., Dawson, S.M., Rayment, W.J.
and Childerhouse, S.J. Distribution of Mauis dolphin,
Cephalorhynchus hectori maui. New Zealand Fisheries Assessment
Report 2005/28, 21p. Published by Ministry of Fisheries,
Wellington (2005)
- Gormley, A.M., Dawson, S.M., Slooten, E.
and Bräger, S. Capture-recapture estimates of Hectors
dolphin abundance at Banks Peninsula, New Zealand. Marine Mammal
Science 21: 204-216 (2005)
- Slooten, E., Dawson, S.M. and Rayment, W.J.
Aerial surveys for coastal dolphins: Abundance of Hectors
dolphins off the South Island West Coast, New Zealand. Marine
Mammal Science 20: 117-130 (2004)
- Dawson, S.M., Slooten, E., DuFresne, S.,
Wade, P. and Clement, D. Small-boat surveys for coastal dolphins:
Line-transect surveys for Hectors dolphins (Cephalorhynchus
hectori). Fishery Bulletin 201: 441-451 (2004)
- Burkhart, S.M. and Slooten, E. Population
viability analysis for Hectors dolphin (Cephalorhynchus hectori):
A stochastic population model for local populations. New Zealand
Journal of Marine and Freshwater Research 37: 553-566 (2003)
- Fletcher, D., Dawson, S. and Slooten, E.
Designing a mark-recapture study to allow for local emigration.
Journal of Agricultural, Biological and Environmental Statistics
7(4): 1-8 (2002)
- Bräger, S., Dawson, S.M., Slooten, E.,
Smith, S., Stone, G.S. and Yoshinaga, A. Site fidelity and along-shore
range in Hectors dolphin, an endangered marine dolphin from
New Zealand. Biological Conservation 108: 281-287 (2002)
- Dawson, S., Pichler, F., Slooten, E., Russell,
K. and Baker, C.S. The North Island Hectors dolphin is vulnerable
to extinction. Marine Mammal Science 17 (2): 366-371 (2001)
- Slooten, E., Fletcher, D. and Taylor, B.L.
Accounting for uncertainty in risk assessment: Case study of Hectors
dolphin mortality due to gillnet entanglement. Conservation Biology
14: 1264-1270 (2000)
- Jones, P.D., Hannah, D.J., Buckland, S.J.,
van Maanen, T., Leathem, S.V., Dawson, S., Slooten, E., van Helden,
A. and Donoghue, M. Polychlorinated dibenzo-p-dioxins, dibenzofurans
and polychlorinated in New Zealand cetaceans. Journal of Cetacean
Research and Management (Special Issue 1): 157-167 (1999)
- Cameron, C., Barker, R., Fletcher, D., Slooten,
E. and Dawson, S. Modelling survival of Hectors dolphins
around Banks Peninsula, New Zealand. Journal of Agricultural,
Biological and Environmental Statistics 4(2): 126-135 (1999)
- Martien, K.K., Taylor, B.L., Slooten, E.
and Dawson, S. A sensitivity analysis to guide research and management
for Hectors dolphin. Biological Conservation 90: 183-191
(1999)
- Dawson, S.M., Read, A. and Slooten, E. Pingers,
porpoises and power: Uncertainties with using pingers to reduce
bycatch of small cetaceans. Biological Conservation 84(2): 141-146
(1998)
- Pichler, F., Baker, C.S., Dawson, S.M. and
Slooten, E. Geographic isolation of Hectors dolphin populations
described by mitochondrial DNA sequences. Conservation Biology
12(3): 676-682 (1998)
- Jones, P. D., Leathem, S. V., Hannah, D.J.,
Day, P.J., Dye, E.A., Hoffman, K.A., Lister, A.R., Porter, L.J.,
van Maanen, T., Symons, R.K., van Helden, A., Buckland, S.J.,
Slooten, E., Dawson, S.M. and Donoghue, M. Biomagnification of
PCBs and 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins
and dibenzofurans in New Zealand's Hectors dolphin. Organohalogen
Compounds 29: 108-113 (1996)
- Slooten, E. and Dawson, S.M. Conservation
of marine mammals in New Zealand. Pacific Conservation Biology
2: 64-76 (1995)
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