Fish usually need to be caught to be measured, but scientists from the Grouper Moon Project and Cayman Islands government have used video camera systems to collect an impressive 17-year dataset of Nassau Grouper lengths from Little Cayman. We combined this with information on growth and abundance to produce a comprehensive assessment of Nassau Grouper on Little Cayman. We found that Nassau Grouper recovered on Little Cayman largely thanks to one strong year class from 2011 spawning, 4-8x average.
Predation by the invasive Indo-Pacific lionfish impacts native fish populations within the Caribbean region and threatens to expand further into Brazil and the Mediterranean. Identifying the range-restricted native fish species with high predation vulnerability in these areas ahead of the invasion front combined with the knowledge of the time a lionfish population typically takes to reach dangerously high densities could help conservation planners attain positive outcomes and reduce biodiversity loss.
The study, conducted by Dr. Stephanie Green (OSU/REEF), Lad Akins (REEF), and others, confirms for the first time that controlling lionfish populations in the western Atlantic Ocean can pave the way for a recovery of native fish. Even if it's one speared fish at a time, data are showing that removals can be effective. And not every lionfish need be removed…the research findings document that reducing lionfish numbers by specified amounts will allow a rapid recovery of native fish biomass.