(Mishnah): Traps for wild animals, birds and fish that were set before Yom Tov - one may not remove the creatures on Yom Tov, unless it is known that they were caught before Yom Tov.

There was a story of a gentile who brought fish to Rabban Gamliel. Rabban Gamliel said - they are permitted, but I do not wish to accept them from him (as I dislike him).

(Gemara - Question): How does he know if it was trapped before Yom Tov? If the entire length of the net has become dislodged from where it was set (from the movements of the animal over a long period of time), he can be certain that it was trapped before Yom Tov. If it did not, he can be certain that it was not trapped before Yom Tov.

Question: If the entire net is dislodged, can he be sure that it was trapped before Yom Tov - perhaps it became dislodged on Yom Tov?!

Answer (R. Yosi bei R. Bun): The case is when he set the trap in a forest (where wild animals are common and an animal will almost immediately be trapped in it before Yom Tov. However, if the trap is not dislodged, it was certainly trapped on Yom Tov, as the movements of an animal will certainly dislodge and ruin the arrangement of the net over a period of time.)

Proof: The Mishnah taught about fish (together with birds and wild animals) - fish are found in the water; similarly, the birds and wild animal are being caught from a place that they are commonly found.

R. Zeira quoting Rav: When Rabban Gamliel stated (see above 1) (b)) that the fish is permitted, he was referring to accepting the fish today in order to be able to eat them after Yom Tov.

R. Chizkiyah/ R. Uziel son of R. Chunya of Beras Chavran: Rabban Gamliel meant that they were even permitted to eat on Yom Tov.

It appears that they held that Safek Muchan (something that is doubtfully prepared for Yom Tov use such as the fish that might or might not have been caught before Yom Tov) may be eaten on Yom Tov.

R. Chanina/ R. Yonasan: Safek Muchan is prohibited.

R. Yochanan: Safek Muchan is permitted.

R. Chiya Rabbah and R. Shimon b' Rebbi: One opinion holds that an object in the hands of a gentile needs to be prepared before Yom Tov. The other one holds that he does not.

We do not know which Chacham said each statement.

Proof: From the story of Rav who was expected to come to the discourse of R. Chiya Rabbah but he did not come. R. Chiya asked him where he had been and Rav answered, "A caravan of gentiles passed through my area and I ate their figs''. This shows that R. Chiya holds that a gentile's property does not require preparation before Yom Tov (otherwise Rav would not have told this to R. Chiya).

A student of R. Simay went to Antrus and they (gentiles) brought him (on Yom Tov) a Durmaskina fruit and he ate it.

A student of R. Yehoshua ben Levi went there and they (also) brought him Durmaskina and he did not eat it.

He came and told to his teacher (that the student of R. Simay ate). R. YB''L told him that that student follows the ruling of his teacher, R. Simay, who holds that the property of a gentile does not need preparation.

R. Abahu quoting R. YB''L: If Damdamniyos grow in a vineyard, there is a prohibition of Kilayim. (These statements are mentioned here to show that in the previous story, the student of R. YB''L was R. Abahu.)

Rav Chuna quoting Rav: Thorns (that produce inferior dates) and palm branches are permitted (and do not have a problem of Kilayim).

(Mishnah): One may only slaughter an animal in danger if he knows that he will be able to eat a Kzayis of its roasted meat before Shabbos.

R. Akiva says - even if he will be able to eat a Kzayis of raw meat from its place of slaughtering (which is an area that has already been skinned).

If he slaughtered it in the field, he should not bring it [home] on a large or small pole held by two people (as it looks like he is taking it to the market for sale).

(Gemara - R. Ba quoting the Rabbanan of Bavel): If he slaughtered it and wolves ate its intestines, it is permitted to eat, as one can assume that the intestines were sound.

Question: Perhaps he should be concerned that they were pierced?

Answer: They can be assumed to be fine (as that is usually the case).

Beraisa: (Although he may not bring it on a pole) he may bring it with its skin, after it is skinned.

Since he is only slaughtering it because it is in danger, how can he move the skin?

He should leave one limb with the flesh still attached and move the skin together with it.