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.
Join Rotarians for Planetary Health on International Women`s Day, from 2.30-4pm Sun 8 March, for the opening of a portrait display to celebrate local women who have made a meaningful impact on protecting animals and nature. The photographs by Sue Lightfoot and others are part of a long-term initiative to build a living, community-driven database of women working to protect animals and the natural world.
The display will be open until 1 April, Thursday to Saturday, 9.30am–3.30pm at the Junction 142 Village markets (church space). As the project develops, community members will be invited to nominate women whose work deserves recognition.
The launch follows the Uniting Church and Plant Inspired`s monthly community luncheon from 12-2pm, which this month features the Older Women`s Network Blue Mountains. For more information contact 0434 691 496 (Teya)
In a world being threatened by war, greed, cruelty and selfishness, the Planetary Health Wellness Weekend will close with a gathering of people who have faith that kindness, generosity, love, creativity and community, and the healing of our land, are a better way forward. We`re thrilled that harpist Dawn Egan will be performing at this inspiring event in the Planetary Health exhibition space. Afternoon tea will be provided. Register to attend here (link in profile under Wellness Weekend): https://bit.ly/4kUkzfm
Had lunch yet? Head over to the Planetary Health Centre for these delicious offerings from @8thingskatoomba today (Sat 28 Feb): South Indian dosa, Korean bao, NY Cheese burger, Bali nasi, Mullum tofu fries, shoestring fires & red bean mochi!
Don`t miss hearing Andrew Skeoch at 2pm today at the Planetary Health Centre! He`s an acoustic ecologist and author of `Deep Listening to Nature` and uses technology to help identify the different `conversations` happening in the world around us. His presentations are a revelation! Reserve your spot here (link in profile under Planetary Health Wellness Weekend): https://bit.ly/4kUkzfm
Experience the joy and sense of purpose that connecting to community, nature, and your own creativity can provide this weekend at the Planetary Health Wellness Weekend. There will be delicious food and coffee, music, art, workshops, nature walks, talks, an Interfaith Gathering and the following stalls:
Food vendor: @8thingskatoomba Zensational Coffee Cart @blue_mts_conservation_society Blue Mountains Wildplant Rescue Blue Mountains Women`s Health & Resource Centre (BMWHRC) Greater Blue Mountains Rotary @permaculturematters Acoustic Ecologist and author of ‘Deep Listening to Nature’, Andrew Skeoch @lacebrookstitchery Sustainable death care BMCC Sustainability and Waste team BMCC Bushcare team View the full program and reserve your spot for a range of activities here (link in profile): https://bit.ly/4kUkzfm
Are humans the only species capable of grief? While grief is often treated as a uniquely human experience, any animal capable of forming attachments also has the capacity to grieve. Join Teya Brooks Pribac, author of ‘Animal Grief and Spirituality: Cross-Species Perspectives’ at the Planetary Health Wellness Weekend on Sat 28 Feb, as she reviews key theoretical foundations of cross-species grief. The flip side of deeply caring for animals is the grief we also feel when we lose them - beloved companion animals, wildlife, or animals harmed by human activity. By validating both nonhuman animal grief and human grief for other animals, this presentation invites a more compassionate and inclusive understanding of loss. Reserve your spot here (link in profile for Wellness Weekend): https://bit.ly/4kUkzfm
Would you like to help those around you who may be struggling with their mental health? Come along to the Planetary Health Wellness Weekend on Sat 28 Feb for an Introduction to Mental Health First Aid. Rotarian Ian Scott will define mental health, talk briefly about the most common mental health issues in Australia, and cover the basics of recognising when someone is experiencing a mental health issue or problem. He`ll outline what is covered in a full Mental Health First Aid course. We are planning to deliver a course later this year so it`s a great opportunity to learn more. Reserve your spot here (Link in profile for PH Wellness Weekend): https://bit.ly/4kUkzfm
At our Planetary Health Wellness Weekend on Sat 28 Feb, Christopher Smith and Juan Roberson, Shared Reading facilitators, will introduce how the reading and discussion of great short stories and poetry can change lives and strengthen social connection, compassion, and empathy. Shared Reading, or social bibliotherapy, for all ages, is one of the most inspiring and magical ways of dealing with loneliness and the struggles of the human condition. "Shared reading makes the process of revealing who you are to other people safer." Learn how groups can be run in-person and online. Reserve your spot here (Wellness Weekend link in profile): https://bit.ly/4kUkzfm
You can view Christopher Smith`s TED Talk here: https://www.youtube.com/watch? v=dAxk61E0R88
It`s just under a week until the Blue Mountains Interfaith Gathering on Sun 1 March, starting with a smoking ceremony by Chris Tobin at 2pm. It`s the culmination of the Planetary Health Wellness Weekend which is looking at physical, emotional, mental and spiritual health. Afternoon tea will be provided. Reserve your spot here (link in profile under Wellness Weekend): https://events.humanitix.com/planetary-health-wellness-weekend
Join Harumi Hayakawa for an introduction to ikebana, the Japanese art of flower arranging at the Planetary Health Wellness Weekend on Saturday 28 February. You’ll get hands-on practice creating an arrangement and learn about the history and philosophy of ikebana, and how this calm, meditative practice uses flowers as a gentle and creative form of therapy. Reserve your spot here (link in profile): https://events.humanitix.com/planetary-health-wellness-weekend
Learn how to incorporate meditation and Mindfulness-Based Stress Reduction into your life at our Planetary Health Wellness Weekend on Sat 28 Feb. Experience a short interactive mindfulness activity led by Betty Ramsay, physio and health coach at The University of Sydney. She has years of experience working with people who are living with life stresses including caring roles, work demands, pain, chronic illness, depression, and anxiety. Reserve your spot for this inspiring and free event here (link in profile): https://events.humanitix.com/planetary-health-wellness-weekend
Thought about doing yoga but never tried it? Join Sheila Annis from Mountain Mist Yoga in Woodford to experience how this rich and vast practice can lead you on a path to better health, and can even be practised from a chair! Reserve your spot for the Chair Yoga session on Sat 28 Feb at the Planetary Health Wellness Weekend in Katoomba here (link in profile): https://events.humanitix.com/planetary-health-wellness-weekend
Learn more about Mountain Mist Yoga here: https://mountainmistyoga.com/
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.
Blue Mountains Planetary Health Centre will host the Disaster Risk Awareness Expo and Family Day on Saturday, 22 November, offering a fun and informative day focused on building safer, healthier and more resilient communities.
