The widow of shark attack victim Mercury Psillakis says her husband’s death “left a place in my heart that I can’t put into words”, as she calls for a revamp of alert systems at Sydney beaches to prevent other families experiencing “the darkness that we’re feeling”.

Maria Psillakis said “questions need to be asked” about the measures to protect surfers, two months after Mercury, 57, was killed by an adolescent great white shark at Long Reef Beach.

“He was my biggest protector, my daughter’s biggest protector, he was our everything, our rock,” Maria told Nine News .

“If anything can come out of this, if we can make a positive out of this loss, I just want to minimise the risk and perhaps prevent this from happening to another family … we just don’t want anyone else to feel the darkne

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