Increase of Lionfish in the Mediterranean

Any club member who has visited the Red Sea or part of the Carribean will have spotted lionfish. An increadably beutiful specimin however extremely invasive where not a native species.

With divers reporting seeing 20 or more lionfish on a single dive around Cyprus, marine conservationists have held the first organised series of culls in the eastern Mediterranean island’s coastal waters.

Lionfish, natives of the Indian and Pacific oceans, were first recorded off Cyprus some five years ago. They arrived as Mediterranean waters warmed and an enlargement of the Suez Canal eased their route through from the Red Sea.

Their numbers have increased rapidly, because with their venomous spines there is no other species to predate on them, and each female lionfish can produce as many as two million eggs a year.


The problem

Young lionfish  mature quickly, consuming native fish and crustaceans as they colonise reef systems. The species is now identified as the most ecologically harmful in the Mediterranean.

Since September 2017 scientists from the University of Plymouth in the UK have been working with bodies in Cyprus such as the Marine & Environmental Research Lab on a four-year project called RelionMed, funded by 1.68 million euros from the EU LIFE programme.

The culls, combined with surveys to assess public attitudes to lionfish, form part of this project.

“There are parts of the world where lionfish are part of the natural eco-system,” says marine biologist Prof Jason Hall-Spencer from the University of Plymouth.

“Until recently the Mediterranean has not been warm enough for them to invade, but now it is and lionfish are increasingly colonising these waters, bringing with them a serious threat of habitat destruction and species extinction.

“Unless we act now, there could be lasting environmental and economic damage. Coastal communities rely on these waters for fishing and tourism, so changes have knock-on effects. Culling these invasive species is the only effective way to reduce their numbers and ensure that marine protected areas continue to regenerate.”


A great, friendly and knowledgable place to learn. I am very grateful they worked around my shifts, meaning anyone can do this sport. I have seen that everyone is willing to offer advice within Diving. Many people have said to me “I wish I learnt to dive when I was younger”.

So hopefully, at 25 and being female, means that a new wave of divers are picking up the hobby. I am looking forward to more dives with the club and maybe aim to start the Sports Diver soon. I have started to buy some of my own kit, but there is no rush as you can rent from the club or borrow from other club members. Whilst diving can look to be an expensive sport, I have learn that if you look after the kit it can last for years (I have been diving in a 15yr old Dry Suit and you wouldn’t know it was “old”).

I would recommend SISAC and this hobby to anyone and am thinking of all the places around the world to visit and dive in! Emma Williams

SISAC is a BSAC Club located in St Ives Cambridgeshire. We like to believe we are a friendly proactive club training new divers and welcoming qualified divers all year round.

Under normal circumstances we meet on Sunday nights at One Leisure St Ives (the St. Ives Recreation Centre), with theory lessons starting at 6:30PM and the pool is available exclusively for our training from 8:15PM. One Leisure St Ives Recreation Centre Westwood Road, St. Ives Cambs. PE27 6WU.  

Due to Covid 19 we have suspended all Pool training and Try Dive activities.

St Ives Sub Aqua Club is affiliated with BSAC (British Sub Aqua Club)

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