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.
Share this article:
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.
More from around the region
Some of the most popular activities we`ve run over the last year have been our plant-based cooking demonstrations. If you`d like to learn more about how to prepare meals that are cheaper, healthier and better for the planet, Teja Brooks Pribac from PlantInspired will be demonstrating how to use pantry essentials to create delicious and healthy plant-based meals tomorrow: Friday 6 December at Junction 142 in Katoomba. Ph. 0434 691 496
#plantbased #planetaryhealth #planetaryhealthdiet #cookingclass #katoomba #bluemountains
If you`ve heard about how inspiring and fun our Skillshare Saturdays are with our free Upcycling Fashion workshop from 9am to 3pm, our Wildlife Exhibition from 9am to 1pm, and our Bushcare to regenerate the Planetary Health Precinct at 1.30pm, there`s still one more opportunity in 2024 to come along and join in, this Saturday 7 December. Well be having some delicious Christmas nibbles to celebrate the end of a very productive year and all are welcome. The Planetary Health Centre is at 33-39 Acacia St Katoomba. Bookings for Upcycling essential (link in profile). To find out more about joining Bushcare ring 0407 437553 #upcyclingfashion #bushcare #planetaryhealth #learntosew #patternmaking #katoomba #bluemountains #natureconnection #wildlifeexhibition #birdphotos #wires
The inspiring Lyrebird Festival kicks off in the Megalong Valley this evening and runs until Sunday 17th November. Enjoy a weekend of music, art, food, wine, talks and nature walks as The Bowerbird Collective brings together art, science, conservation and world class music performances. All events can be booked separately or together with a Festival pass. Pricing includes a `Pay what you can` option.
The Lyrebird can be heard in the Megalong Valley imitating the calls of hundreds of other species, as well as producing their own thrilling sounds. The festival also includes a very special film screening of The Message of the Lyrebird on Sunday afternoon.
Tickets available here: https://bit.ly/3AON8In
(or at link in profile)
#megalongvalley #lyrebirds #lyrebirdfestival #bowerbirdcollective #bluemountains #planetaryhealth
In April 2021 Blue Mountains City Council became the first local government in Australia to adopt a motion to integrate Rights of Nature principles into its operations and practices. Today the Blue Mountains Planetary Health Initiative, the Blue Mountains World Heritage Institute and lawyer Kingsley Liu, had the great pleasure of workshopping further ways to implement Rights of Nature with this inspiring group of Law students from the University of New South Wales.
#rightsofnature #UNSW #lawstudents #planetaryhealth #bluemountains
At our World Animal Day event we launched the Community Supporting Community Program with a plant based cheese degustation. Teja Brooks Pribac from PlantInspired is now offering interactive classes in which you can have fun learning new techniques for using vegetables to create delicious meals that are good for your health and the health of the planet. Small groups: 6-8 people. $65.50pp. Bookings essential.
Classes currently on offer:
Plant-based cheese making & demo
Saturday 9 Nov, 1-3pm. Lawson NSW: https://www.facebook.com/events/1274663973560691
[DATE CHANGE!] The Tastemaster: how to turn your average vegetable into a mouthwatering masterpiece
Sunday 17 November, 11am-2pm. Katoomba: https://www.facebook.com/events/517611447925601
End of year special: plant-based cooking essentials 2-class bundle
Saturday 30 November, Sunday 1 December, 11am-2pm. Katoomba NSW: https://www.facebook.com/events/1116156823213312
Cooking with seitan
Saturday 7 December, 11am-2pm. Katoomba NSW. https://www.facebook.com/events/1553960262666738
PlantInspired is also offering interactive plant-based cooking classes and demos for individual clients, private groups and businesses. Choose from a range of preset classes or get in touch to tailor your own.
All profits utilised to help vulnerable members of the community through the Community Supporting Community program. Check the website for more info: www.plantinspired.com.au (link in profile)
#plantinspired #plantbasedcooking #vegan #community #planetaryhealth
Skillshare Saturdays literally offer a `breath of fresh air` at the Planetary Health Centre on the first Saturday of the month! At our free Upcycling Fashion workshop this month you can learn more about all types of zips and how to do basic pockets and pocket flaps. You can bring your own sewing machine or use one of ours. And at Bushcare in the afternoon, you can immerse yourself in the bush at the Planetary Health Precinct as you help restore habitat and protect biodiversity (while meeting some great people and enjoying time in nature). Bookings essential for Upcycling Fashion at Eventbrite here: https://bit.ly/4dZWUoM (link in profile)
If you`d like to join our Bushcare Group contact Karen Hising at khising@bmcc.nsw.gov.au or call the Bushcare Office on 4780 5623
#upcyclingfashion #skillshare #planetaryhealth #bushcare #community #togetherwecan #zerowaste #regeneration #circulareconomy
As 190 countries gather for the @cop16colombia UN Biodiversity Summit, to focus on how we can protect the world’s flora and fauna, we’d like to thank all those local individuals and organisations dedicated to the same goal who came together for World Animal Day at the Blue Mountains Planetary Health Centre on Saturday 5 October. They offered ways for everyone to learn more and take action. From the Blue Mountains Bird Observers, who led over 40 people on a guided Breakfast with the Birds walk, to many others who offered information stalls, talks, workshops, a Wild Life exhibition, live music, plant-based food and hands-on Bushcare. We also launched the Community Plant Based Cooking Project with the first class to be held on Saturday 9 November at @roseyravelstonbooks in Lawson. Places are limited. Learn more here: https://plantinspired.com.au/
#worldanimalday #biodiversity #plantbased #planetaryhealth #bluemountains #katoomba
Did you know that old lino, window putty, and adhesive can contain asbestos? Yesterday the Asbestos & Hazardous Materials Management Conference kicked off with a pre-conference workshop at the Blue Mountains Planetary Health Centre. It included hands-on `spot the asbestos` and asbestos sampling sessions. This year`s theme is `Working together for a safe and healthy future`. #asbestos #hazardousmaterials #conference #planetaryhealth #bluemountains #katoomba
Delicious plant based and gluten free pastries courtesy of Clean Cravings at World Animal Day today at the Blue Mountains Planetary Health Centre. Such a lovely day! #planetaryhealth #worldanimalday
Paul Nagle and other members of the Blue Mountains Bird Observers leading 40 people on a Guided Breakfast with the Birds as part of World Animal Day at the Blue Mountains Planetary Health Precinct. It`s a stunning day. Lots more to come at 33-39 Acacia St Katoomba.
A huge thank you to Josh Logan from Logan Signs, Lithgow, for installing our Circular Water Signage in time for our World Animal Day Celebration today at the Blue Mountains Planetary Health Centre (33-39 Acacia St Katoomba). We have a full program of events with lots of information on how to prepare for the summer ahead and how to create urban areas that help us share our home respectfully with all species. It will be a fun family day too with storytime, craft and live music for kids! (Link in profile) #worldanimalday #planetaryhealth #familyday #katoomba #bluemountains
And our Wild Life exhibition is now up for World Animal Day tomorrow at the Blue Mountains Planetary Health Centre. Photographs by Warren Hinder, Merryl Watkins, Holly Kent and Tracy Burgess. Check out all the other events from stalls, talks, possum box demo, kid`s craft and animal storytime, plant based food and live music to Bushcare. @33-39 Acacia St Katoomba Link in profile. #planetaryhealth #worldanimalday #katoomba
