Dynamics of marine predators off an oceanic island and implications for management of a preventative shark fishing program

摘要: Oceanic islands are productive ecosystems, and so have higher densities of many marine predators. We investigated the dynamics elasmobranch teleost predators in coastal waters off Reunion Island, Indian Ocean, using fisheries-independent data from a preventative shark fishing program January 2014 to December 2019. developed moonlight index that calculates exact through incorporating lunar azimuth, elevation angle island topography. quantified spatial–temporal environmental drivers occurrence zero-inflated mixed models assessed species-specific catchability program. A consistent segregated pattern was observed with all species at dusk after-dusk associated lower luminosity. Scalloped hammerhead sharks (Sphyrna lewini) giant trevally (Caranx ignobilis) were found patrol earlier day than other species. Tiger (Galeocerdo cuvier) bull (Carcharhinus leucas) showed high spatial segregation, potentially reducing competition. Teleost more frequently inside coral reef environment Marine Protected Area but there no clear for sharks. Seasonality trevally, stingrays, sharks, guitarfish (Rhynchobatus australiae), presence during early winter periods related turbidity, photosynthetically available radiation, temperature. Inter-annual variation catch rates suggested juvenile tiger might be replacing nearshore habitats, consequences mitigation bite hazard discussed. Operational alternatives proposed enhance impacts upon critically endangered species, improve their conservation ensure local ecosystem balance.