The Country
  • The Country home
  • Latest news
  • Audio & podcasts
  • Opinion
  • Dairy farming
  • Sheep & beef farming
  • Rural business
  • Rural technology
  • Rural life
  • Listen on iHeart radio

Subscriptions

  • Herald Premium
  • Viva Premium
  • The Listener
  • BusinessDesk

Sections

  • Latest news
  • Coast & Country News
  • Opinion
  • Dairy farming
  • Sheep & beef farming
  • Horticulture
  • Animal health
  • Rural business
  • Rural technology
  • Rural life

Media

  • Podcasts
  • Video

Weather

  • Kaitaia
  • Whāngarei
  • Dargaville
  • Auckland
  • Thames
  • Tauranga
  • Hamilton
  • Whakatāne
  • Rotorua
  • Tokoroa
  • Te Kuiti
  • Taumurunui
  • Taupō
  • Gisborne
  • New Plymouth
  • Napier
  • Hastings
  • Dannevirke
  • Whanganui
  • Palmerston North
  • Levin
  • Paraparaumu
  • Masterton
  • Wellington
  • Motueka
  • Nelson
  • Blenheim
  • Westport
  • Reefton
  • Kaikōura
  • Greymouth
  • Hokitika
  • Christchurch
  • Ashburton
  • Timaru
  • Wānaka
  • Oamaru
  • Queenstown
  • Dunedin
  • Gore
  • Invercargill

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 / The Country

Freshwater fish becoming stressed and dying in hot temperatures in Hawke's Bay

Hawkes Bay Today
12 Feb, 2020 02:25 AM2 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

Dead yellow-eyed mullet at the Esk River mouth after blockage last week caused by low river levels. Photo / Hawke's Bay Regional Council

Dead yellow-eyed mullet at the Esk River mouth after blockage last week caused by low river levels. Photo / Hawke's Bay Regional Council

Fish are dying in Hawke's Bay streams that are heating up in the relentless summer sun.

Hawke's Bay Regional Council scientist Dan Fake said as river levels get low and water temperatures rise freshwater fish can be stressed.

"Many of our native freshwater fish prefer temperatures around the 20C, so when in-stream temperatures are pushing 29C like they have been in the past couple of weeks, we start seeing cases of infection in fish and even fish dying," Fake said.

"Trout also don't do well in warm temperatures, and it's not uncommon to find sick or dead trout at this time of year," he said.

Low river levels can also cause river mouth blockages. When a swell moves gravel there sometimes isn't enough water flow in the river to remove it.

Advertisement
Advertise with NZME.
Advertisement
Advertise with NZME.

This occurred at the Esk River mouth last week where yellow-eyed mullet were found dead.

Yellow-eyed mullet fish are not typically freshwater fish but are commonly found in rivers such as the Esk River mouth.

"In smaller systems this can result in fish deaths as the backed-up water becomes stagnant, heats up and dissolved oxygen concentrations drop," Hawke's Bay Regional Council Schemes team leader Antony Rewcastle said.

Advertisement
Advertise with NZME.

River mouth openings can be a difficult task as their success depends on the river level tide and swell conditions among other factors, Rewcastle said.

"If the sea conditions aren't right or if there isn't enough flow in the rivers, the mouth can block up within a day or two," he said.

Residents are encouraged to contact the council on 06 835 9200 if they see blockages or distressed fish.

Hawke's Bay Fish and Game manager Jesse Friedlander said anglers should fish early or later in the day when temperatures are cooler and avoid fishing at all on the hottest days.

"If you're intending to release your trout; keep it in the water and avoid touching it if possible. Net the hooked trout quickly to avoid the fish becoming exhausted and never drag a fish up on to hot river rocks or sand," he said.

Save

    Share this article

Latest from The Country

The Country

'Some of the worst we’ve seen': Huge pile of concrete dumped illegally

12 Jul 12:00 AM
The Country

'Merry hell' in Mamaku: Village held 'to ransom' by hoons

11 Jul 06:00 PM
The Country

'Massive milestone': Rare native geckos, parrots return amid pest-control success

11 Jul 06:00 PM

From early mornings to easy living

sponsored
Advertisement
Advertise with NZME.

Latest from The Country

'Some of the worst we’ve seen': Huge pile of concrete dumped illegally

'Some of the worst we’ve seen': Huge pile of concrete dumped illegally

12 Jul 12:00 AM

Cleaning up the concrete and other waste is expected to cost between $25,000 and $30,000.

'Merry hell' in Mamaku: Village held 'to ransom' by hoons

'Merry hell' in Mamaku: Village held 'to ransom' by hoons

11 Jul 06:00 PM
'Massive milestone': Rare native geckos, parrots return amid pest-control success

'Massive milestone': Rare native geckos, parrots return amid pest-control success

11 Jul 06:00 PM
Opportunities in America for NZ red meat

Opportunities in America for NZ red meat

11 Jul 05:01 PM
Solar bat monitors uncover secrets of Auckland’s night sky
sponsored

Solar bat monitors uncover secrets of Auckland’s night sky

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
  • NZ Herald e-editions
  • Daily puzzles & quizzes
  • Manage your digital subscription
  • Manage your print subscription
  • Subscribe to the NZ Herald newspaper
  • Subscribe to Herald Premium
  • Gift a subscription
  • Subscriber FAQs
  • Subscription terms & conditions
  • Promotions and subscriber benefits
NZME Network
  • The New Zealand Herald
  • The Northland Age
  • The Northern Advocate
  • 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
  • NZME Events
  • © Copyright 2025 NZME Publishing Limited
TOP