Damaging fishing practices will be banned in almost 22% of Jersey's waters.
The new Marine Protected Area network is increasing, from around 6.5%.
It prevents mobile fishing gear (i.e. dredging and trawling) from damaging the marine ecosystem, such as Maerl beds, which are slow-growing calcified red algae that can host up to 173 species per square metre.
It grows at a speed of around 1mm a year, but acts as a nursery for juvenile fish and scallops, which are commonly caught here.
The expanded protections will come into force by 1 September 2026, with international goals of 30% by 2030.
Freddie Watson, Channel Islands Project Manager for Blue Marine Foundation, says this is a pivotal moment for Jersey’s marine environment.
"This is the result of years of careful work, conversation and collaboration, underpinned by strong scientific evidence.
"By protecting these places, we’re giving marine life the space it needs to recover, supporting more resilient fisheries and helping our seas adapt to the pressures of climate change.
"We commend States Members in backing the network and taking this once‑in‑a‑generation opportunity to secure a healthier future for Jersey’s waters."
Alan Le Maistre, Chief Executive of the National Trust for Jersey, says from vast kelp forests to the intricate maerl beds that take centuries to develop, Jersey’s seas host some of the most valuable habitats in our natural heritage.
"Their fragility means that once lost, they cannot simply be replaced, underscoring the importance of today’s decision.
"The marine environment shapes our Island culture, our wellbeing and our future, and it is vital that we protect it.
"The Trust is pleased to have partnered with Blue Marine over many years in advocating for these MPAs and securing this meaningful step for future generations."
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