they link to the law that Ross posted here, but here is the write-up from the Mass DMF site, not that it specifically singles out charter captains cleaning fish for clients:
Bass must be kept whole, with head, tail and body intact - no mutilation permitted (other than evisceration). The discard of dead, legal size striped bass is prohibited. To prohibit the practice of high-grading, recreational fishermen may not retain legal-sized striped bass and release said fish in favor of another larger legal-sized striped bass captured subsequently. It shall be unlawful to keep striped bass alive in the water by attaching a line or chain to the fish or placing the fish in a live well or holding car. Striped bass are measured from the tip of the snout or jaw (mouth closed) to the farthest extremity of the tail. Note: Permitted party/charter vessel operators may fillet striped bass for their customers. See 322 CMR 6.07 (4)(g) for details.
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