Quarter, or quarterly reporting period, means one of four successive 3-month periods, which begin at 0001 hours, A.l.t., on the first day of each quarter, and end at 2400 hours, A.l.t., on the last day of each quarter, as follows:
(1) 1st quarter: January 1 through March 31.
(2) 2nd quarter: April 1 through June 30.
(3) 3rd quarter: July 1 through September 30.
(4) 4th quarter: October 1 through December 31.
50 CFR § 679.2
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: