Yes, salted fish has the same amount of protein. The nutrients in salted fish besides protein is B12 and omega-3 vitamins.
Salted Cod Fish.
fish and meat
Probably salt fish; a salted fish - dried and salt added fish.
salted
saltfisk
It is recommemded to avoid salted meat and fish, salted dressings, salted pretzels and any food with an excess of salt.
It is the salted, cured and ground up roe (eggs) of the cod fish or the carp fish. The food is native Greece.
It's brined anchovies
Caviar.
While salted fish paste is primarily made of salt, a natural preservative, it also has other ingredients that will spoil over time. So, in answer to your question , no, salted fish paste will "go bad' after a particular amount of time.
Salted Fish