(a) South of a line extending due west (true) from Point Conception, white seabass may not be taken for commercial purposes from March 15 through June 15, inclusive, except that not more than one white seabass not less than 28 inches in total length may be taken, possessed, and sold by a person or possessed on a vessel each calendar day if such white seabass is taken incidental to gill and trammel net fishing operations conducted under authority of a permit issued pursuant to Fish and Game Code Section 8681. Any fish so taken shall not be transferred to any other vessel. During a gill and trammel net fishing trip which includes more than one calendar day, not more than one white seabass not less than 28 inches in total length may be possessed or sold during or at the end of the trip.