California Code, Fish and Game Code - FGC § 6652

Every person engaged in harvesting kelp shall determine the weight by any method, including the displacement method, approved by the department of all wet kelp immediately after it is delivered to the licensee's place of business or elsewhere, and the weight shall be entered in a book to be kept by the licensee. The book shall be open at all times to the inspection of the department.

Every person engaged in harvesting kelp shall, on or before 10 days after each month of the term of the license, render a statement of the weight of all wet kelp harvested during the preceding month.