Wetlands Condition
Tracking the condition of wetlands across the Great Barrier Reef catchment
Healthy waterways underpin our lifestyles and livelihoods. When waterways thrive, so do we.
He’s been fishing since he was a kid, he knows our river systems like the back of his hand and he’s a national angling champion – Karim de Ridder talks barra fishing and the move to more sustainable fishing practices.
Growing up on the Tablelands, Karim was introduced to fishing by his Dad, on the waters of the Wild River. He got a taste for barra fishing while at university in Townsville, and never looked back. With teammate Craig Griffiths, he’s won multiple ABT Team of the Year awards, two Barra Nationals and a string of competitions up and down the Queensland coast.
When he’s not on the tournament circuit you’ll find him fishing anywhere from Hinchinbrook to the Daintree.
“I don’t like fishing around crowds. For me, it’s about getting away from it all and I love it when I can’t see anything except the water. It’s pure stress relief!”
Our Wet Tropics systems fish differently to the rest of Australia. It means we don’t have the same numbers of barra as the big flood plains, but there’s still plenty around.
“Because the Great Dividing Range is so close to the coast, our rivers have a short and sharp entry to the ocean which is unlike anywhere else in the country. Rivers elsewhere will meander for hundreds of kilometres with a lot of saltwater influence moving up them whereas ours punch out a lot of freshwater because of the high rainfall.”
Over the last 20 years, Karim says anglers have become more sustainable in terms of how fish are targeted and which fish become ‘keepers’.
“There’s more awareness about how fish stocks are doing and what’s going on in our local areas – especially with the younger generation of anglers coming through. Closed seasons are generally adhered to. There is still work to do but there’s a lot more focus on, and understanding of, maintaining stocks. In my lifetime I’d love to see the barra bag limit reduced to three, and anything over one metre let go.
“Climate change impacts fisheries, so any improvement we can make locally to the systems that our fisheries and nursery grounds rely on is worth doing. Whether that be agricultural improvements like reducing sediment run-off, or fishing improvements like more sustainable takes – it’s all going to help get better fish recruitment.”
A net-free zone declared in Trinity Bay in 2015 was welcomed by recreational fishers and anecdotally it has resulted in the return of larger apex predatory fish, like barramundi. This means there is more breeding and more ‘recruitment’ which, in turn, means barra surviving through to adulthood.
“Net-free zones protect brood stocks. Now that fish aren’t getting picked up in commercial nets it’s a daily occurrence for people fishing off places like Yorkeys Knob to catch nice big fish,” says Karim.
Karim’s top tip to get you started is about selecting your fishing spots:
“You want to look for somewhere with a bit of tidal movement that creates a pressure point – basically anywhere that the current hits and causes an eddy because this is where the bait will stack up. On the beach it might be a sand bar, a jetty or a rocky headland. From a boat it might be small creek mouths or something that juts out from a big sweeping bend. The bait piles up and the barra will be waiting.”
Plastic lures, like other plastics, break up in the environment and are ingested by fish. We don’t know much yet about what this means for fish, but there is evidence that microplastics and nanoplastics can move from a fish’s stomach to its muscle tissue, which is the part that we typically eat.
Karim says the amount of artificial bait in our waterways is astonishing.
“Whether it’s a broken lure, an empty coke bottle that’s been tossed out of a boat or a big clump of fishing line left snagged in a tree ready to tangle a bird, I wish everyone would be a bit more considerate about the environment we’re fishing in.”
The annual barramundi fishing season runs from Feb 1 to Oct 31. It’s hugely popular with both locals and visitors so the closed season is extremely important. It protects barra during their spawning period and allows the population to replenish.
Barramundi are opportunistic predators. They eat just about anything that lives in the water – from insects, spiders, prawns and smaller fish to other barramundi and baby crocodiles. They have a complex life cycle which includes a sex change. Barras get the best of both worlds by being born male and turning into females from about five years of age.
Tracking the condition of wetlands across the Great Barrier Reef catchment
Mena Creek banana farmers are making changes to improve the water leaving their farm
No fishing zones are thriving around inshore islands of the Great Barrier Reef
Martine joined the Wet Tropics Waterways team as a Science Technical Officer in early 2024 and is keen to apply her experience in statistical programming and database development for the Report Card.
She is an environmental scientist and ecologist and has worked on water quality and aquatic ecology projects as a consultant and in private industry for over 20 years.
Martine has many hobbies and is currently dabbling in horticulture.
With a degree in marine biology and zoology from JCU, Phil has had a diverse career covering research in fisheries biology, 15 years in reef tourism and 13 years with GBRMPA delivering engagement and partnerships programs. Since 2019 he has been self-employed and operates as a consultant to a range of stakeholders on waterway related programs.
He is a keen fisherman.
James joined Wet Tropics Waterways as Executive Officer in 2021 and is passionate about working with stakeholders to communicate the value of our unique waterways. His role involves facilitating and coordinating our partnership program, growing our network and investment into the report card program, and science communication. James oversaw the 2022 Innovations in Waterway Health Forum, and hosted season four of the Reef and Rivers podcast.
James is an ecologist and has previously worked on wetland management in the Murray Darling basin, fish passage in Mackay, and aquatic research in the Wet Tropics.
Outside of work you’ll find him in a local waterway with a mask and snorkel, or hiking or biking around our beautiful region.
Richard has been the Science Technical Officer for Wet Tropics Waterways since 2016. His role involves producing the annual results for the waterway health assessment of the wet tropics region using data from a wide range of sources, to present as scores and grades, as well as developing new indicators to address knowledge and monitoring gaps. He works in collaboration with technical staff at other regional report cards.
Richard has a background in freshwater ecology research projects and environmental assessments with CSIRO, University of Queensland, Queensland Government and as a consultant. For a long time he’s been interested in freshwater aquaculture and continues this interest through farming freshwater crayfish, alongside other farming activities.