Green Zones On The Reef Really Do Work

Yes, there is evidence that Great Barrier Reef green zones, or no-take zones, are effective in protecting and increasing fish populations, especially coral trout. These zones help replenish fish stocks and benefit the overall health of the reef ecosystem.

Prior to the Reef rezoning of 2004, protected areas on the Reef covered less than 5%. But after an intense two-year planning period and more than 30,000 public submissions, protected areas were increased to more than 33% in 2004.

There was a lot of conjecture at the time as to whether it was the right thing to do and there were some seriously opposing views.

But the science is undeniably clear; green zones really do work.

Here's why they work:

Increased Fish Numbers and Size:
Research shows that green zones have led to significant increases in coral trout numbers and average size. Bigger fish can produce more offspring, contributing to the replenishment of fish stocks.

Spill-over Effect:
Fish, like coral trout and snapper, spawn and reproduce within green zones, and their larvae travel to surrounding fished areas, benefiting those areas as well.

Improved Ecosystem Health:
Increased fish populations, particularly predators like coral trout, can help control the populations of other species, like crown-of-thorn starfish, which are a threat to coral reefs. Corals found in green zones tend to be healthier, showing less disease, than fished zones.

Benefits for Fisheries:
The increase in fish populations in green zones can also lead to increased yields and sustainability for fisheries in surrounding areas.

Long-term Protection:
The Great Barrier Reef Marine Park Authority has been using zoning as a key management tool since the 1980s, with the 2004 rezoning significantly expanding protection and further improving results.

Of course, for green zones to be effective, adhering to the rules (compliance) is extremely important. Compliance data and research shows that commercial fishing compliance is very good. Unfortunately, recreational fishing compliance needs to improve.

Overall, this is a win, win, win situation. Green zones on the Great Barrier Reef are a successful strategy for protecting fish populations, supporting healthy ecosystems, and ensuring the long-term sustainability of both the reef and the industries that depend on it.

Contributed with thanks to Whitsunday Conservation Council

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Coral Trouts spawn and reproduce within the green zones. Photo supplied

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