Boating and Marine
http://www.sa.gov.au/subject/Transport,%20travel%20and%20motoring/Boating%20and%20marine
Boating weather: http://www.weatherzone.com.au/marine/sa
Fishing/Fisheries
Catch limits and legal lengths: http://www.pir.sa.gov.au/fisheries/recreational_fishing/catch_limits_and_legal_lengths
PIRSA: http://www.pir.sa.gov.au/fisheries
SARDI: http://www.sardi.sa.gov.au/
Diving
https://www.adelaidescuba.com.au/
Marine Parks
Marine park info: http://www.environment.sa.gov.au/marineparks/home
Education/resources
Fishes of Australia: http://www.fishesofaustralia.net.au/
Atlas of Living Australia: http://www.ala.org.au/
OZCAM (Online Zoological Collections of Australian Museums): http://www.ozcam.org.au/
General Interest
SA Maritime Museum http://maritime.historysa.com.au/