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What's New?/Hector’s Dolphin last updated 3 September 2007
North Island Hector’s Dolphin - help protect this critically endangered population
Hector’s dolphin jumping
 
The Problem

Hector’s 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 Hector’s dolphins, also known as Maui’s dolphins, have been worst affected. With a population size of about 100 individuals they are critically endangered.

Dead Hector's dolphins caught in net
 

The Solution

This problem can be solved simply and effectively by ensuring that only selective fishing methods are used in areas where Hector’s dolphins are found.

In particular, in waters less than 100m deep:

  • Use only fishing methods that don’t catch dolphins
  • Replace gillnets and trawling with selective, sustainable fishing methods
Hector’s dolphin mother and calf
 
What's been done so far?

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

 
 
What you can do to help
 

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.

 
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 Hector’s 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 Hector’s 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 Maui’s 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  Maui’s 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 Hector’s 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 Hector’s 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 Hector’s dolphins (Cephalorhynchus hectori). Fishery Bulletin 201: 441-451 (2004)
  • Burkhart, S.M. and Slooten, E. Population viability analysis for Hector’s 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 Hector’s 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 Hector’s 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 Hector’s 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 Hector’s 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 Hector’s 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 Hector’s 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 Hector’s 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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