<human>: How do you do this: To identify female blue crabs to harvest crab roe.

OPTIONS:
- Look at the topside of the crab. The female blue crab has a broad, triangular-shaped area in the center of the shell, whereas the male has a more distinctive, elongated spire in the center.
- Look at the underside of the crab. The female blue crab has a broad, triangular-shaped area in the center of the shell, whereas the male has a more distinctive, elongated spire in the center.
<bot>: Look at the underside of the crab. The female blue crab has a broad, triangular-shaped area in the center of the shell, whereas the male has a more distinctive, elongated spire in the center.