YES - from the Whitsunday website first half (why didn't you google it?)
http://www.tourismwhitsundays.com.au/visitor-information/stinger-information/

Marine stingers may be present in the waters of tropical Queensland year round, with the higher risk season during October – May. During this period, jellyfish are prevalent in the waters around the mainland, islands and have occasionally been found out on the reef.

Safe swimming

By taking simple precautions to minimise risk you can safely and comfortably swim in all parts of the Whitsundays region. When taking part in any snorkelling, diving, or swimming activity with an accredited Whitsundays tour operator, protective "stinger suits" will be available to all customers at little or no cost.

Please see marinestingers.com.au or ask your tour operator for more information.

If you are stung, Whitsunday Regional Council provide vinegar to treat stings at each of the beaches on the Whitsunday Coast and all tour operators should carry vinegar too. Pour vinegar liberally over the affected area and seek medical attention urgently. Call 000 for an ambulance.

There are two main types of "stingers" in the area, the Box Jellyfish and the Irukandji Jellyfish.

No Idea about fishing - sorry.