Commentaire sur Nedarim 6:4

דג דגים שאינו טועם – neither fishe nor fishes, and everything is implied.

Introduction This mishnah discusses vows of abstinence from types of fish.

טפלין – without salt.

‘[Konam,] if I taste fish or fishes,” he is forbidden [to eat] them, whether large or small, salted or unsalted, raw or cooked. But he may eat chopped terith and brine. If one forbids himself to eat either “fish” or “fishes” he is forbidden to eat all kinds of fish. Since he used both plural and singular, he clearly intended to forbid himself from all fish. However he may eat chopped terith, because that is not called fish. Although I don’t know exactly what this was, I assume that it was so chopped up that people didn’t really think of it as fish. He may also eat the brine, the liquid that comes out of fish (sounds gross to me, but certain members of my family do seem to enjoy this).

בטרית טרופה (a brine containing hashed pickled fish in which you can cannot recognize the clean and unclean fish) – fish that they cut it up into small pieces and sell it and it has a name of its own and is not within the general category of fish and fishes.

He who vows [abstinence] from zahanah is forbidden chopped terith, but may eat brine and pickled fish brine. Zahanah is a foul-smelling mixture of different chopped fish, and hence one who vows not to eat zahanah, may also not eat chopped terith. However, he may still eat different types of brine.

ציר – water/liquid that comes out from the salted fish (i.e., brine).

He who vows [abstinence] from chopped terith may not eat of brine and pickled fish brine. Chopped terith includes in it brine and pickled fish brine. Therefore one who forbids himself from eating chopped terith may not eat any type of brine either.

ומורייס – fat that comes out from salted fish.

צחנה (small fish preserved in brine) – a mixture of kinds of brined fish which is called צחנה /small fish preserved in brine), and its example is in the Tractate Avodah Zarah [40a] this is shiploand of small fish preserved in brine,

ומותר בציר ובמורייס – since the essence of the matter of the fish is not absorbed in them.

הנודר מטרית טרופה – for since it (i.e., the Mishnah) mentioned טרופה /chopped, from everything that is mixed with a species of fish is implied.