'Rashi': There is radiance where it dwells, for its fins, below by its belly, illuminate like the sun. Chadudei is like Cherev Chidah - it is sharp and polished. Therefore, radiance is called Chadudei. Chares is the sun, like "ha'Omer la'Cheres v'Lo Yizrach."

Ibn Ezra: There is sharp earthenware under it, and it does not feel it.

Malbim: On its belly are scales as hard as sharp earthenware.

'Rashi': Yirpad Charutz applies to Chadudei Chares; Alei Tit applies to Tachtav. In its place, on the sand, the mud of Ripudo (a sheet or place to lie down, like "Refidaso Zahav"). Charutz is a kind of gold - "ume'Charutz Tevu'asah", "Tov Piryi me'Charutz umi'Paz."

Ibn Ezra: Yirpad is spreading, like "Refidaso Zahav." Charutz is something cut; the Seifa repeats the Reisha. Alei Tit - there is mud under the Tehom.

Malbim: If it lies on matters as sharp as iron spikes, it does not feel them, as if it lies on moist mud.