Why is short-grain Japanese rice better for nigiri than long-grain basmati, even before any fish is added?

Answer: Grains cling gently

Grains cling gently ✓ — Right. Short-grain sushi rice has a starch balance that lets cooked grains cling, so a nigiri mound can hold together while still breaking apart in the mouth. Long-grain rice is prized in other dishes precisely because it stays separate and fluffy. The counterintuitive part is that sushi needs controlled stickiness, not maximum stickiness or maximum separation.

Grains stay separate — No. Separate grains are useful for pilaf, biryani, and many long-grain rice dishes, but they work against the small stable cushion needed for nigiri. Rouxbe notes that long-grain rice is high in amylose and cooks more separated, while short-grain rice has more amylopectin and becomes stickier. Sushi needs the middle: cling without paste.

Grains become creamy — No. Creaminess is useful in risotto, where starch release becomes part of the dish, but nigiri needs intact grains that hold lightly and then separate in the mouth. Rouxbe's rice-starch guide helps explain the contrast: different starch balances create fluffy, creamy, or sticky textures. Sushi rice is aiming for controlled cling, not a creamy mass.