Del. Code tit. 7, § 2402

It shall be unlawful for any person to tong or to rake clams for commercial purposes in this State unless said person has applied for and secured from the Department and has in his or her possession a valid clam tong/rake license. The fee for a commercial clam tong/rake license shall be $57.50 for residents and $575 for nonresidents. A commercial clam tong/rake license will entitle the holder to harvest a maximum number set by Department regulations.