Tosefta for Chullin 225:15
ת"ש מסיפא דסיפא
It may be that the second clause was put in to make clear the reference in the first: lest you might think that the first clause refers to where the clean fish was salted and the unclean was not, leaving us to infer that where both were salted it would be forbidden, he therefore adds the second clause, where the clean fish was salted and the unclean was not, which shows that the first clause speaks of the case where both were salted, and even so it is permitted.
Tosefta Terumot
Unclean fish that was pickled with clean fish: He washes [the clean fish] thoroughly and it is permitted. Unclean salted fish and clean unsalted fish: It is forbidden. Clean salted fish and unclean unsalted fish: It is permitted. Unclean fish that was cooked with clean fish: We treat it as though [the clean fish was cooked with] leeks (see Hul. 97b:8) -- if there is sufficient quantity to impart taste, it is forbidden, and if not, it is permitted.
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