Upvote:2
Anchor Bible by Lopukhin (Толкование на книгу Товита) says that some people attribute it to "sabot" or "alsabut" in Arabic language, others think it is pike. The latter is especially due to the fact that pike is common among Jews and is a clean fish.
Please note that the success of usage of that fish was not due to the nature of the fish itself, as noted in that Anchor Bible later, but due to the prayer, as note A. Glagolev and Prof. Drozdov in the cited works.