Mono filament: These are fishing lines that are left in the ocean. They can be left there and since some fish can only detect light they might swim right into them and get caught.

Entangled: Entanglement is when fish get caught in old fishing lines or nets that someone just threw out into the ocean. This can choke the under sea organisms.

Plastic Bags: Plastic bags are mistaken with jellyfish and can do harm to any sea creature that consumes jellyfish.

Ghost Fishing: Ghost fishing is when fishing gear gets lost at sea. This gear is meant to capture fish so if they are floating on in the ocean then obviously they're going to hurt something.

Plastic Pellets: These pellets may be easily consumed by fish or various other creatures and then causing them to choke and die.