Absolutely, there's a few ways to use them. We own two fish and chip shops up here on the tablelands just up the hill from you, so I have access to a lot of fish waste. We have a couple of people that come and collect it as well, from talking to them they simply dig a hole and bury it around the trees. In our climate they break down in a couple of weeks into beautiful compost/fertiliser that the fruit trees can access. A few people also place it under the tree and cover with about a foot of mulch, there no smell as long as it adequately covered.
My preferred method for using them is to ferment them with a microbial product called em1 and a bit of molasses for a couple of weeks, There is no smell at all that way thanks to the em1 and it makes a product that can be used in a watering can etc for thing in pots and seedling. As to the salt on them it really is a non issue unless your watering with salt water, you get more chloride etc from conventional fertilisers.