Northern Advocate
  • Northern Advocate home
  • Latest news
  • Business
  • Opinion
  • Lifestyle
  • Sport
  • Property
  • Video
  • Death notices
  • Classifieds

Subscriptions

  • Herald Premium
  • Viva Premium
  • The Listener
  • BusinessDesk

Sections

  • Latest news
  • On The Up
  • Business
  • Opinion
  • Lifestyle
  • Rural
    • All Rural
    • Dairy farming
    • Sheep & beef farming
    • Horticulture
    • Animal health
    • Rural business
    • Rural life
    • Rural technology
  • Sport
  • Property
    • All Property
    • Residential property listings

Locations

  • Far North
  • Kaitaia
  • Kaikohe
  • Bay of Islands
  • Whangārei
  • Kaipara
  • Mangawhai
  • Dargaville

Media

  • Video
  • Photo galleries
  • Today's Paper - E-Editions
  • Photo sales
  • Classifieds

Weather

  • Kaitaia
  • Whangārei
  • Dargaville

NZME Network

  • Advertise with NZME
  • OneRoof
  • Driven Car Guide
  • BusinessDesk
  • Newstalk ZB
  • Sunlive
  • ZM
  • The Hits
  • Coast
  • Radio Hauraki
  • The Alternative Commentary Collective
  • Gold
  • Flava
  • iHeart Radio
  • Hokonui
  • Radio Wanaka
  • iHeartCountry New Zealand
  • Restaurant Hub
  • NZME Events

SubscribeSign In
Advertisement
Advertise with NZME.
Home / Northern Advocate

Crab pests spotted

By Lindy Laird
Reporter·Northern Advocate·
1 Apr, 2016 01:30 AM3 mins to read

Subscribe to listen

Access to Herald Premium articles require a Premium subscription. Subscribe now to listen.
Already a subscriber?  Sign in here

Listening to articles is free for open-access content—explore other articles or learn more about text-to-speech.
‌
Save

    Share this article

These are colourations of the invasive Japanese or Asian paddle crab - aggressive, larger than native paddle varieties and with rows of spikes along each eye.

These are colourations of the invasive Japanese or Asian paddle crab - aggressive, larger than native paddle varieties and with rows of spikes along each eye.

Moves are under way to stem a possible infestation of Japanese paddle crabs in the Ngunguru estuary.

A large number of the crabs (Charybdis japonica, and sometimes called Asian paddle crabs) were found there during a marine survey two weeks ago. It is the first time the species has been seen or reported there since nine adult crabs were found in the same area in December 2014.

Northland Regional Council (NRC) has notified local iwi, fishers, boat owners and other organisations that an invasion would put extra pressure on vulnerable shellfish stocks.

Japanese paddle crabs are aggressive predators and compete with native sea life for food; their main prey are bivalve shellfish.

Their presence in the area where local pipi and cockle populations are already collapsing has spurred a two-pronged response from the NRC.

Advertisement
Advertise with NZME.
Advertisement
Advertise with NZME.

Aquatic biosecurity officer Irene Middleton said one approach will be to establish the size of the infestation in the estuary; the other to trial a trapping programme. The operation would be done with support from the local community as it would need to be a long term project, she said.

"We're trying to get an idea whether there's a population outside the estuary or if they're contained to the one site in the estuary. There are a lot of local fishers out there who would have been pulling them in - they're easily caught in flounder nets, for example - so we think we'd have heard before now if they're more widely spread," Ms Middleton said.

They are classified as an "unwanted organism" and cannot be gathered for food or taken away from where they have been caught, Ms Middleton said.

Advertisement
Advertise with NZME.

The species looks similar to the native swimming, dwarf and hairy red paddle crabs. It has a shell up to 12 centimetres wide, six spikes on either side of its eyes and flat back legs. It can be a variety of colours, from off-white, to light green, olive green and deep chestnut with purple markings.

It is more aggressive than the native paddle crabs that attract heavy numbers of fishers from Auckland's Asian community to Bream Bay beaches. Also slightly bigger, the Japanese variety would be more likely to latch on to someone's foot than just run across it, and to sink claws into and cling to a finger digging into sand in shallow water.

The species is widespread in the Hauraki Gulf and has been detected in small numbers in Whangarei Harbour and Bay of Islands.

Discover more

Boatie fined for hiding food

02 Mar 08:02 PM

Meeting on menace of sea pest

11 Mar 01:30 AM

Rat race gears up to find rogue rodents

11 Mar 05:00 PM

Uncertainty over biosecurity rules covering crab

04 Apr 11:30 PM
Save

    Share this article

Latest from Northern Advocate

Northern Advocate

The Good Drop: Warehouse, Salvation Army team up for textile recycling

Northern Advocate

Police name person who died in early morning Kaitāia crash

Northern Advocate

Kaipara mayoral hopefuls on rates, museums and what they would do differently


Sponsored

Solar bat monitors uncover secrets of Auckland’s night sky

Advertisement
Advertise with NZME.

Latest from Northern Advocate

The Good Drop: Warehouse, Salvation Army team up for textile recycling
Northern Advocate

The Good Drop: Warehouse, Salvation Army team up for textile recycling

Donors receive a 10% voucher for clothing purchases over $30 as an incentive.

14 Jul 04:00 AM
Police name person who died in early morning Kaitāia crash
Northern Advocate

Police name person who died in early morning Kaitāia crash

14 Jul 02:07 AM
 Kaipara mayoral hopefuls on rates, museums and what they would do differently
Northern Advocate

Kaipara mayoral hopefuls on rates, museums and what they would do differently

14 Jul 12:00 AM


Solar bat monitors uncover secrets of Auckland’s night sky
Sponsored

Solar bat monitors uncover secrets of Auckland’s night sky

06 Jul 09:47 PM
NZ Herald
  • About NZ Herald
  • Meet the journalists
  • Newsletters
  • Classifieds
  • Help & support
  • Contact us
  • House rules
  • Privacy Policy
  • Terms of use
  • Competition terms & conditions
  • Our use of AI
Subscriber Services
  • The Northern Advocate e-edition
  • Manage your print subscription
  • Manage your digital subscription
  • Subscribe to Herald Premium
  • Subscribe to the Northern Advocate
  • Gift a subscription
  • Subscriber FAQs
  • Subscription terms & conditions
  • Promotions and subscriber benefits
NZME Network
  • The Northern Advocate
  • The New Zealand Herald
  • The Northland Age
  • Waikato Herald
  • Bay of Plenty Times
  • Rotorua Daily Post
  • Hawke's Bay Today
  • Whanganui Chronicle
  • Viva
  • NZ Listener
  • Newstalk ZB
  • BusinessDesk
  • OneRoof
  • Driven Car Guide
  • iHeart Radio
  • Restaurant Hub
NZME
  • About NZME
  • NZME careers
  • Advertise with NZME
  • Digital self-service advertising
  • Book your classified ad
  • Photo sales
  • © Copyright 2025 NZME Publishing Limited
TOP