Possible Clues:

• Award won by Alice Munro and Stephen King
• They're pretty much all called Shamu, at SeaWorld
• Ordered to start record label bearing The Animals all at sea
• Keiko's kin
• 'Wolves of the sea'
• Predators whose genus name translates to 'of the kingdom of the dead'
• Penguin hunters
• Largest members of the oceanic dolphin family
• They might catch some rays
• Humpback cousins