Sounds like the pelican itch problem has gone. Use to be really bad-I'm talking 30 years ago. Basically if you went for a swim you had to accept the fact you'd get bite by the little buggers. If you're wondering what they are read on-
"Pelican Itch is the common name given to a skin irritation caused by the marine parasite Bilharzia (Austrobilharzia terrigalensis). The parasite occurs from Fraser Island in Queensland to the Victorian border and is common in Narrabeen Lagoon in the summer months when the water temperature exceeds 24 degrees Celsius.
The parasite has a complex lifecycle and lives some of the time in the marine snail Batillaria australis. During the parasite's 'larval' stages, the larvae leave the snail and swim about looking for warm-blooded animals - generally birds such as seagulls, however, swimmers are not immune. If the parasite comes in contact with a human, it will burrow under the skin and eventually die, causing an itch. If not scratched and infected, the lesions normally recede and disappear after two to three weeks.
If you, or your family are affected by pelican itch, a doctor or chemist will be able to assist with management of the rash and pain relief. The existence of pelican itch in Narrabeen Lagoon is a natural phenomenon and opening the lagoon more frequently would not assist the situation."
I feel itchy just reading that... Anyway, glad they're not a problem anymore. Hope there's some wind during my stay