The salmon industry failed to provide timely and accurate information during an unprecedented mass die-off in which thousands of tonnes of fish perished, a report says.

More than 14,000 tonnes of farmed salmon died from January to April in Tasmania amid an outbreak of bacterial disease P.salmonis rickettsia in its southern waters.

Fish matter washed up on several beaches during the outbreak, sparking multiple anti-salmon farm protests.

Tasmania's Environment Protection Authority on Monday released a report which outlined inadequacies around communication, preparedness and waste management.

It also warned a "business as usual" approach would not be enough in the face of rising environmental volatility, heightened community scrutiny and emerging marine disease threats.

The authority has

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