There are all sorts of different fish in the oceans and seas, and there are many different diets associated with them. There is no one food that ALL Saltwater Fish will eat.
Tuna are all marine (saltwater) and they are predatory, so yes, tuna eat saltwater fish. They can only eat saltwater fishe because they do not live in freshwater.
no
yes
dont you mean saltwater fish?
both i think
Some species do and some don't
Yes they do. Striped Bass and other Saltwater species love Bloodworms. Some people say that Nightcrawlers or even earthworms are something that Saltwater fish eat. I have never tried that though. I know those worms work great for Freshwater fish. A lot of Saltwater species like Blood and Sandworms a lot.
because saltwater fish must be live in saltwater
no saltwtr fish eat saltwtr food tropical fish eat tropical food fresh watr fish eat fresh watr food
saltwater
Yes, goldfish will enjoy snacking on the kinds of treats intended for saltwater fish because saltwater fish foods contain more nutrients. However it is still best to feed a goldfish a regular goldfish flake/pellet diet, therefore only occasionally treating it to saltwater fish food.
You can eat just about everything some popular saltwater fish are red snapper, flounder, cobia and grouper in my opinion.