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Caribbean groupers can help keep invasive Lionfish under control, if only ...

By Leonard Ho - Posted Jun 25, 2011 06:05 AM
Lionfish have been found in the stomachs of groupers fished out of the Caribbean. A recent study has concluded 'Lionfish biomass exhibited a 7-fold and non-linear reduction in relation to the biomass of grouper.' In layman's terms, the presence of groupers means drastically reduced Lionfish population. Groupers effectively keep Lionfish in check. But there's a problem.
Caribbean groupers can help keep invasive Lionfish under control, if only ...

Photo by Matthew Hoelscher (C.C.)

The problem is large Caribbean groupers are chronically overfished in the Caribbean.  For example, species such as the Nassau Grouper (Epinephelus striatus, right photo) are currently endangered due to human fishing activity.  If fishing practices continue unchanged, the potential for groupers to keep Lionfish in check will remain just that: an unrealized potential.

Instead of training sharks to eat Lionfish, hosting Lionfish fishing tournaments, promoting human consumption of Lionfish, and other exotic reduction measures, perhaps the best way to save the Atlantic from the unnatural Indo-Pacific Lionfish is to foster a healthy, natural population of groupers.

The study is published in PLoS ONE.

 

For those not familiar with the Lionfish problem in the Atlantic:


reprinted from www.advancedaquarist.com/blog/fishing-tournament-targets-invasive-lionfish

Eric Heupel (graduate student at University of Connecticut in Oceanography) blogs in www.deepseanews.com about a 'Seascape of Fear' ... an Atlantic seascape filled with Pterois volitans: the Indo-Pacific Lionfish.  During dives in 2007, he was unable to spot any Lionfish;  In 2011, he counted 13 in a small 100 square meter patch ... by snorkeling during the span of just two hours!  He writes:

If you’re not up to speed on the Lionfish invasion, they were originally spotted off Southern Florida in 1992. By 2000 they were confirmed from Florida to North Carolina and in Bermuda. They now occur throughout much of the Caribbean and up the Atlantic Coast to Long Island Sound and southern Massachussetts. There is debate about how far north there is a year round population, as they have a minimum temperature of ~10°C. They have even been found by divers  at 400′ depths, which unfortunately also implies we will not be able to get them all, even if we decided to try.

"The genie is well and truly out of the bottle now, no putting it back."

Lionfish are threatening Atlantic fish populations and entire ecosystems. The speed at which Lionfish are spreading across the Atlantic is startling.  P.volitans can lay 30,000+ eggs every other month!  As Eric laments: "The genie is well and truly out of the bottle now, no putting it back."

Please read his blog to get a sense of the gravity of the Lionfish situation in the Atlantic.  This should serve as a reminder to hobbyist to practice the utmost responsibility in not only the care but also the disposal of non-native species.  With invasive Caulerpa and Lionfish wrecking havoc in global waters, it's a somber reminder just how fragile ecosystems are ... and how small actions can have a big impact.

Author: Leonard Ho
Location: Southern California

I'm a passionate aquarist of over 30 years, a coral reef lover, and the blog editor for Advanced Aquarist. While aquarium gadgets interest me, it's really livestock (especially fish), artistry of aquariums, and "method behind the madness" processes that captivate my attention.

Website: http://www.advancedaquarist.com.

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