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The shallow water helps protect them from larger sharks and killer whales that would eat them with relish, like chewy hors d’oeuvres, if they drifted too far into the deep blue sea.

The uncertain future of two killer whales is no closer to being resolved despite the closure of their marine zoo home two months ago.

Tasmania's Department of Natural Resources and Environment said 157 false killer whales had beached near Arthur River, in the island's north west.

The young female, whom researchers named J61, was a new addition to the Southern Resident population, a federally protected endangered group of fish-eating killer whales stretching from British Columbia to Monterey.

Managers say shows featuring killer whales and dolphins attract 90% of Marineland's visitors – and that without it the business isn't viable.