Seeing as the object of the plague was to strike the Egyptians' god, what is the significance of the fact that the fish died?
Seforno: To demonstrate that the water did not just resemble blood, but that it actually turned into blood. 1
In order to denigrate their god still further by making the water putrid. 2
What is the definition of "Dagah"?
Nedarim, 51b: We can extrapolate from this Pasuk that "Dagah" incorporates both large and small species of fish. 1
Nedarim, 51b: Nevertheless, in the realm of Nedarim, we follow Lashon B'nei Adam (human terminology).
What does "Venil'u Mitzrayim ... " mean?
Rashi: It means that the Egyptians will try to find a remedy to cure the water.
Seforno: They will attempt to find water by digging around the Nile.
Rashbam: Refer to Bereishis 19:11:1:1.
Targum Yonasan: Refer to Bereishis, 19:11:1:2.
What is the significance of the various forms of punishment mentioned here?
Oznayim la'Torah: The Torah mentions four punishments in fulfillment of the four punishments comprised