Many of these creatures could in the running for inclusion on the list of top ocean predators, but these 5 stand above the rest.
Orca (Killer Whale)
Great White Shark.
Barracuda.
Blue Marlin.

African lungfish (Protopterus annectens)
Alligator snapping turtle (Macrochelys temminckii)
Alligator gar (Atractosteus spatula)
American alligator (Alligator mississippiensis)
American crocodile (Crocodylus acutus)
Arapaima (Arapaima)
Atlantic blue marlin (Makaira nigricans)
Atlantic goliath grouper (Epinephelus itajara)
Baiji (Lipotes vexillifer)
Baikal seal (Pusa sibirica)
Black caiman (Melanosuchus niger)
Black grouper (Mycteroperca bonaci)
Black marlin (Istiompax indica)
Amazon river dolphin (Inia geoffrensis)
Bull shark (Carcharhinus leucas)
Common snapping turtle (Chelydra serpentina)
Electric catfish (Malapteruridae)
Electric ray (Torpediniformes)
False gharial (Tomistoma schlegelii)
Gharial (Gavialis gangeticus)
Giant freshwater stingray (Himantura chaophraya)
Gilded catfish (Zungaro zungaro)
Goonch catfish (Bagarius yarrelli)
Goliath tigerfish (Hydrocynus goliath)
Great barracuda (Sphyraena barracuda)
Greenland shark (Somniosus microcephalus)
Great blue heron (Ardea herodias)
Great hammerhead (Sphyrna mokarran)
Great white shark (Carcharodon carcharias)
Human[note 3] (Homo sapiens)
Humboldt Squid (Dosidicus gigas)
Kaluga (fish) (Huso dauricus)
Killer whale (Orcinus orca)
Lake trout (Salvelinus namaycush)
Largemouth bass (Micropterus salmoides)
Leatherback sea turtle (Dermochelys coriacea)
Leopard seal (Hydrurga leptonyx)
Lionfish (Pterois)
Lion's mane jellyfish (Cyanea capillata)
Loggerhead sea turtle (Caretta caretta)
Mediterranean monk seal (Monachus monachus)
Moray eel (Muraenidae)
Murray cod (Maccullochella peelii)
Muskellunge (Esox masquinongy)
Nassau grouper (Epinephelus striatus)
Nile crocodile (Crocodylus niloticus)
Nile perch (Lates niloticus)
Northern pike (Esox lucius)
Piraíba (Brachyplatystoma)
Pseudoplatystoma (Pseudoplatystoma)
Redtail catfish (Phractocephalus hemioliopterus)
Salmon shark (Lamna ditropis)
Saltwater crocodile (Crocodylus porosus)
South Asian river dolphin (Platanista gangetica)
Semutundu catfish (Bagrus)
Smallmouth bass (Micropterus dolomieu)
Sperm whale (Physeter macrocephalus)
Australian trumpet (Syrinx aruanus)
Tiger shark (Galeocerdo cuvier)
Walleye (Sander vitreus)
Wels catfish (Silurus glanis)
Whale shark (Rhincodon typus)