When sourcing bait squid, the primary focus should be on freshness and structural integrity. Look for 'Sea-Frozen' (frozen at sea) products rather than land-frozen, as this locks in the natural scent and texture. The squid should have clear, bright skin with minimal tearing, and the eyes should be clear, not cloudy. For B2B buyers, ensure the moisture content is controlled to prevent excessive weight from ice glazing, which should ideally be between 3% to 10% depending on the preservation method.