Farmed salmon are like any farm animal. The amount of feed (re; pilchards & other less desirable fish species) hugely outweighs the amount of produced edible meat from the fish.
It takes less than 2kg of wild fish to produce 1kg of farmed salmon. Australia has no native salmonids. Atlantic salmon come from the northern hemisphere (as the name suggests) and are farmed there as well as in Tasmania. I work for Huon Aquaculture, a privately owned, family business in Tasmania that produces great, farmed, Atlantic salmon (and trout). Check out our website: www.huonaqua.com.au/ , especially the myth-buster section: www.huonaqua.com.au/about/myth-busters/
If you could feed them carp you would be doing everyone a big favour.
^^^ Interestingly enough, carp were used for crayfish bait locally & apparently worked very well - until the running costs to catch the carp, store them & transport the fish (including meeting health regs) become too expensive...on the flip-side, saltwater fish makes for very good yabbie bait (as does tinned catfood?!).
I doubt that carp would suit as a staple diet for a salmonoid?
