They are not included because they are in effect "negative reserves". Normally you can't fish in a National Park, however some parts of them have restricted fishing allowed. See https://www.legislation.tas.gov.au/view/html/inforce/current/sr-2019-067#JS2@EN So there is no "Port Davey Marine Reserve", but there are parts of the Southwest National Park where you are allowed to carry out some fishing. 