Fish fingers is a very dodgy business product. There is no clear indication of quality or even name of fish used. Very often, it is a mixture of different fish meat, meat which cannot be used in other products normally. There is a scientific evidence of not mixing different fish meat together due to negative health effects, like it is done in Fish Fingers. 
I still eat them from time to time, but with clear conscience that Fish Finger is bad for health and not the fish that my body needs. Unmixed fish in fried, grilled, steamed or any other way is way more healthy than fish fingers. In UK, there is a law now to define the type of fish used in Fish and Chips. They either say it is Cod/Haddock etc or just say Mixed Fish :), which is a clear indication to customers what they are getting in the box. HTH
