Spiny sea urchin-like fishing lure moving over a colorful coral reef to fly fishing, undewater caribbean sea

fly fishing sea urchin spiny black shell coral reef ocean coral colorful sea creatures underwater marine life echinoderm invertebrate calcium carbonate algae symbiotic relationship reef ecosystem biodiversity habitat conservation threatened species shells skeletons spines protective covering feeding grazing algae eaters tropical waters shallow water reproduction larvae metamorphosis research educational fascinating beautiful caribbean sea atlantic los roques venezuela clear crystal static shot fishes swim aquarium nature wonder