Final answer:
A 'vessel constrained by draft' is not directly related to inland rules; it pertains to maritime operations and regulations, such as ballast water management, that aim to reduce the introduction of non-indigenous species through commercial shipping activities.
Step-by-step explanation:
The question asks about whether a 'vessel constrained by draft' is an inland rule. In the context of ballast water (BW) management, the movement of BW in commercial ships is a significant vector for the introduction of non-indigenous species (NIS) to marine, estuarine, and freshwater systems across the globe. BW management efforts include internal transfers of ballast water to maintain stability during cargo operations and sourcing BW from open ocean sources instead of coastal sources. These practices can mitigate the need to undergo ballast water exchange (BWE), a process with geographic and operational constraints that may not be applicable to all vessels. Furthermore, the challenge lies in achieving concentration-based discharge standards that significantly lower propagule pressure.