A mature Blue Mountains Perch. (Photo: NSW Fisheries)
Story by Julie Nance
The Blue Mountains Perch may not be as adorable as a cuddly koala, but it is also an endangered animal in need of awareness and support. Populations of the freshwater fish have been hit hard by drought, fire and flooding over the past few years. A NSW fisheries study, while sobering reading, is helping experts develop a plan to save the fish.
Key Points:
The Blue Mountains Perch has dwindled in numbers and become extinct in parts of Greater Sydney, but populations are hanging on in the Blue Mountains.
We can all play a part in protecting the fish by reducing erosion on our properties and highlighting to others that it exists and it needs our help.
A couple sits on a large rock enjoying a romantic picnic beside a beautiful Blue Mountains waterhole. Little do they know they are in the presence of an ancient and beautiful animal.
The Blue Mountains Perch lies camouflaged at the bottom of creeks and deep water holes during the day. In the night-time it is active; its big eyes seeking out water bugs and smaller fish to feast on.
While a successful predator, the Blue Mountains Perch has been at the mercy of environmental forces that have treated it very harshly.
According to a NSW Fisheries study, Blue Mountains Perch populations were under immense stress from a prolonged drought from 2017 to 2019. Approximately half of their habitat was severely impacted by the 2019/20 “Black Summer” bushfires that followed.
In February 2020 heavy rains throughout the Hawkesbury-Nepean catchment caused severe runoff and hillslope erosion. Large volumes of sediment were deposited in waterways, threatening aquatic species with ongoing habitat loss. It is thought the Blue Mountains Perch was further impacted by these rainfall events.
The study, ‘Drought, fire, and flood: A population assessment of the Blue Mountains perch (eastern Macquarie perch) ….’ charts the findings of a comprehensive assessment of the distribution of Blue Mountains Perch, mainly between 2021 and 2022. A total of 88 sites were targeted within the Hawkesbury-Nepean and Hunter catchments.
The surveys involved the use of electrofishing: passing an electrical current through water, which temporarily stuns fish so they can be caught, processed and released. Netting was also used as well as environmental DNA (eDNA) analysis. This new technology finds traces of DNA in the water as a way of knowing if a species is present, without catching or disturbing it. In total, 27 Blue Mountains Perch were captured, ranging in length from a 30 mm juvenile to a 235 mm sexually mature fish.
NSW Fisheries experts electrofishing for Blue Mountains Perch. (Photo: NSW Fisheries)
Blue Mountains Perch were absent from seven of the 20 water bodies that the species was known to occur in prior to the 2017 to 2019 drought, 2019/20 bushfires and 2020 flooding. This represents the potential loss of Blue Mountains Perch from approximately 35 per cent of sampled water bodies known to previously contain the fish.
One of the Perch’s biggest advocates is Will Goodwin, a member of Blue Mountains City Council’s Healthy Waterways team.
“They are a really pretty fish; they’ve got this beautiful, mottled brown and silvery grey on the side and they live in such beautiful habitat,” he says.
“We literally have an animal named after the Blue Mountains that pretty much none of us have heard of. Many of us have come far closer than we realise at Blue Mountains swimming holes.
“We have the power to really stand up for it. We could be looking at an extinction here, but if the right things are done, we can see the Perch completely bounce back and it can be a huge success story. The biggest thing the Blue Mountains Perch needs is advocacy.”
A juvenile Blue Mountains Perch. (Photo: NSW Fisheries)
Will says the Perch study is helping Blue Mountains City Council better prioritise its conservation work, including improving waterway health. He says a Council Biodiversity Strategy will soon be on public exhibition.
“Based on the map/site coordinates in the study, I’ve been able to determine which sites fall in our LGA and I’m really happy to see that a number of them returned positive results for Blue Mountains Perch,” Will says. “Populations are hanging on in the Blue Mountains, but they need help.”
Healthy Waterways team member Will Goodwin, who is passionate about freshwater fish (and turtles). (Photo supplied)
The report says there are new threats to the Blue Mountains Perch. This includes alien species invading their habitat e.g. Redfin perch; diseases such as Epizootic Haematopoietic Necrosis Virus (EHNV); and potential habitat loss from possible raising of Warragamba Dam and mining within the Nepean River sub-catchment.
Long-term monitoring (5+ years) of the Blue Mountains Perch has been recommended in the report, as well as key habitat remediation activities including desilting, riparian improvements, bank stabilisation, and the restoration and conservation of in-stream rocky habitat.
Habitat where the Blue Mountains Perch is believed to occur. (Photo supplied)
Will: “This is a fairly healthy creek in a Blue Mountains Perch catchment. I took this underwater photo at night, using a flash.”(Photo: Will Goodwin)
The report recommends: “Urgent management actions are required to protect Blue Mountains Perch from further decline and improve the species’ resilience.”
Will says a lot of conservation activities already carried out in the Blue Mountains has indirectly benefited the species, including protecting and restoring creeks.
“In a happy accident, our existing stormwater works such as the Glenbrook raingardens project are our biggest tool in our tool belt to help the Blue Mountains Perch,” Will says. “Moving forward, we’re looking at prioritising Blue Mountains Perch catchments for future raingarden projects and funding.”
The Blue Mountains Perch was long thought of as a variation of the Macquarie Perch, a freshwater fish native to cooler, mid-altitude areas of south-eastern Australia. However, past studies, both genetic and morphological (looking at the form and structure of an organism or any of its parts), are providing strong support for it to be classified as a separate species.
“That’s part of the problem and part of the mystery of the fish – it used to be considered Macquarie Perch. Because it doesn’t officially scientifically exist as its own species, it is difficult to protect it.” – Will Goodwin
When you listen to Will enthusiastically talk about the Blue Mountains Perch, you can see why he has such a strong desire to help it. He highlights their “clever strategy” to keep their eggs safe, laying them at the top of a fast-flowing stream.
“As the eggs bounce along in the current, they get wedged amongst the rocks and pebbles,” Will says. “The rocks keep predators out, and the constant flow of water keeps them clean and well oxygenated.”
Will says unfortunately there is now far too much sediment in our streams.
“It comes from our backyards and construction sites, but also from the erosion of creeks as they get blasted with urban stormwater,” he says.
“Even the fast-flowing sections of streams get covered with this blanket of sand on the bottom. Without that rocky habitat, there’s no way for this fish to breed”.
Known Blue Mountains Perch habitat that has been blanketed by sediment. It’s a fast-flowing riffle, so it should naturally have a nice rocky bottom. All the little cracks have been filled in. (Photo: Will Goodwin)
So how can we help?
Will says individuals shouldn’t feel powerless to assist the Perch. He cites advocacy for koalas and the Regent Honeyeater as examples of people power making a positive difference.
“It’s about recognising the beauty of this fish and getting people behind it,” Will says.
“No one is going to protect something they haven’t even heard of, and the Blue Mountains Perch has missed out on much needed protection because of that. Just by spreading the word, you can make a huge difference for this fish.”
Take Action:
Try to reduce erosion: look out for any bare earth on your property, and keep it covered with plants or mulch.
Tell someone: the more people that know about this species, the more protection it will get. Sharing this story, or just mentioning it to a friend or family member is one of the best things you can do for it.
Read about a stormwater treatment initiative at Glenbrook featuring the type of raingarden that is ultimately helping the Blue Mountains Perch: It Takes a Village to Care for a Creek.
This story has been produced as part of a Bioregional Collaboration for Planetary Health and is supported by the Disaster Risk Reduction Fund (DRRF). The DRRF is jointly funded by the Australian and New South Wales governments.
Learn how to Grow Connected Landscapes for the magnificent Glossy Black Cockatoo at 4pm on Saturday 7th June. In our first Planetary Health Forum we’ll be hearing from Amanda Foxon-Hill from Mid Lachlan Landcare, Jayden Gunn from Birdlife Australia and Samantha (Pongi) Bowden from Glenbrook Public School, to learn more about the Glossy and how we can all help improve its habit from the Lower Mountains to Central NSW. We’re also launching a Community Tree Planting Day on 5 July in Goologong (near Cowra) to which we’re hoping we’ll get a large group of volunteers to help make a difference for this beautiful bird (and lots of other species as well!)
Habitat connectivity is essential if species are to adapt and overcome the challenges posed by our changing climate.
Join us as we imagine life as a Glossy Black Cockatoo. We`ll make our way through the temperate eucalypt forests of Dharug & Gundungurra land here in the Blue Mountains before leaving the Great Dividing Range for the Wheat & Sheep belt of the Central Tablelands. Our journey ends on Wiradjuri Land, North West of Cowra in the dry scleropyhyll forests of the Conimbla & Nangar National Parks, the start of the Western Woodland Way
Jayden Gunn is an adept wildlife photographer, ecologist, and environmental educator, with a deep passion for Australian birdlife. Through his lens, he captures Australia`s unique wildlife, using digital storytelling to connect people with nature in meaningful ways.
Links in profile to book in.
Book for the Forum here: https://bit.ly/43FzamP
Register your interest for the Community Tree Planting Day here: https://bit.ly/3HwYHa5
Watch an interview with Amanda here: https://www.youtube.com/watch?v=77y2jrCzINo&t=52s
Read more about Glenbrook Public Schools work for the Glossy Black here: https://lowermtnslocalnews.com/glossy-black-cockatoos/
Our newsletter is now out! View our video of Dr Keith Suter on "Making Peace in the World Today” and read about Growing Connected Landscapes for the Glossy Black Cockatoo and the 2024 Wynne Prize exhibition at the Cultural Centre. You can also book in for our Mushroom Cultivation and Tai Chi workshops, and our Planetary Health Bushcare on Skill Share Saturday, 7 June. And PS. We’re a finalist in the NSW Local Government Excellence Awards. Read the newsletter here (link in profile): https://bit.ly/4dEFL5u
Yesterday a delegation from the University of Sydney and the Razak School of Government in Malaysia visited the Planetary Health Centre to exchange experiences on the challenges all our local governments are facing, including adapting to climate change, managing ageing populations, and finding economic opportunities for small councils to support their community`s needs. @rsog_insta #localgovernment #planetaryhealth #disasterriskreduction #systemicchange #councils #malaysia #exchange...
As part of an international project to advance science communication for Planetary Health (SciCoPH), Indonesian science journalists, science communication experts and bioscientists visited the Blue Mountains Planetary Health Centre to learn more about what we`re doing last month. Read our story in Katoomba Area Local News here: https://bit.ly/43MFUjM (link in profile)
Has your place been smashed by all this rain? Check out our video of how Anne Mellor, on a sloping block in Springwood, built Japanese guttering and a dry creek bed to manage large influxes of stormwater in the most beautiful way. You can view the video in our Water Management Playlist on our YouTube channel (link in profile) Full instructions on how to do it in our story in Springwood Area Local News here: https://bit.ly/3YXIsJe (link to Springwood Area Local News in our profile. Search Individuals and you`ll find our story) #stormwater #flood #japaneseguttering #drycreekbed #beprepared #trenches #japanesegardendesign #planetaryhealth #springwood...
We need your help! Can you help us grow our YouTube channel subscribers and `watch hours` so we can get YouTube income to produce more great resources. Subscribe and watch our videos here (link in profile): https://www.youtube.com/@bluemountainsplanetaryhealth
Earlier this month, around 160 first year medical students from The University of Notre Dame Australia were introduced to Planetary Health and Dharug culture at the Planetary Health Centre, and learnt how to help people prepare for future heatwaves. Watch Professor Madden`s lecture and learn more about what they`re learning in our Planetary Health news here: https://planetaryhealthnews.com/future-doctors-learn-about-planetary-health/ (link to Planetary Health News in our profile) @notredameaustralia @doctorsfortheenvironment @ph_alliance @planetaryhealthcollective...
Recently we grew these stunning mushrooms with a kit from EarthRising Mushroom Farm in Lawson. If you`d like to learn how to grow your own, and get a kit to take home with you, we`ll be holding a Mushroom Cultivation workshop with Alex from EarthRising at our next Skill Share Saturday on 7 June. Bookings essential here: https://bit.ly/4dfc3nv (link in profile)
In a moving call for peace on Anzac Day, over 80 people gathered in the golden afternoon light at Peace Park in Katoomba to reflect on war and ask the hard questions about its grim reality. The day was interspersed with reflections, poetry, a minute of silence, and songs by The Bearded Ladies Choir. Read more, including about upcoming Peace events, in our new Planetary Health News here (link in profile):
Our newsletter is now out! Read about the launch of our new global Planetary Health News; about the Blue Mountains Peace Collective`s Anzac Day Reflection; about how future doctors are learning about Planetary Health; and about how science journalists from Indonesia visited the Planetary Health Centre to advance science communication for Planetary Health. You can also book in for our Mushroom Cultivation and T`ai-chi workshops. Read the newsletter here (link in profile): https://bit.ly/3YF3CvA
In May last year a group of local women launched Homes for Older Women Blue Mountains to address the housing crisis locally. They have now successfully secured affordable accommodation for 50 older women! Writer Julie Nance helped set up the program as a volunteer and recently finished a challenging but rewarding year as Program Manager. She shares the experiences of women involved with, and impacted by, the grass-roots initiative. Read more in Springwood Area Local News here (link in profile): https://springwoodlocalnews.com/gaining-hope-and-a-home/
What glorious weather for our Skill Share Saturday today! We had a fabulous day of sharing: T`ai-chi, Fashion Upcycling, Cool Climate Edible Gardens. and then a very enjoyable and productive Bushcare Session, in which we made real progress making a dint into the massive wall of invasive weed. It`s exciting to see beautiful bushland revealed when the weed is removed! And thanks Amanda for this photo of the little frog that leapt out of the rhubarb during our Cool Climate Edible Garden workshop. #skillshare #taichi #upcycling #coolclimategardening #bushcare #planetaryhealth #katoomba #bluemountains...
Julie Nance is a community storyteller with the Blue Mountains Planetary Health Initiative. In her coverage of the Lower Mountains area, she brings 30 years’ experience in communications, publishing and journalism.
After specialising in health and social issues as a journalist, Julie led creative teams in the government and not-for-profit sectors including the Aged Care Quality and Safety Commission, YMCA NSW, Cancer Council NSW and The Children’s Hospital at Westmead.
Julie is passionate about empowering people with quality information to help them make informed choices.
Rain gardens are a brilliant way to manage water runoff. Recently Council teams and contractors collaborated with Sydney Water to create three different types of native rain gardens at Glenbrook Visitor Information Centre, showcasing how sustainability and beauty are the natural features of these innovative but simple water management solutions.
