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manta ray fish oceanic marine underwater sea nature wildlife animal aquatic biology environment ecosystem marine life oceanography ichthyology elasmobranch chondrichthyes manta birostris pelagic tropical subtropical temperate coastal neritic benthic cartilaginous filter feeder plankton krill zooplankton micronekton nekton benthos biomass trophic level food chain food web predator prey symbiosis commensalism mutualism parasitism conservation endangered species threatened species vulnerable species protected species marine protected area fishery bycatch overfishing habitat loss pollution climate change global warming acidification deoxygenation eutrophication invasive species disease parasite injury mortality population decline extinction