Tunnel opening.
(ii) Tunnel opening. Each pot used to fish for groundfish must be equipped with rigid tunnel openings that are no wider than 9 inches (22.86 cm) and no higher than 9 inches (22.86 cm), or soft tunnel openings with dimensions that are no wider than 9 inches (22.86 cm).
Source
50 CFR § 679.2
Scoping language
In addition to the definitions in the Magnuson-Stevens Act and in part 600 of this chapter, the terms used in this part have the following meanings: