Nine men have appeared in private at Inverness Sheriff Court charged with alleged identity card fraud.
The foreign workers, who all gave addresses in Inverness, made no plea or declaration and were remanded in custody.
The court appearances followed a raid by police and immigration officials on Tuesday at the premises of fish processors Strathaird Salmon Ltd.
The operation was carried out with the co-operation of the company.
Management had raised concerns over identification papers used by some of the overseas staff to get jobs.
The nine who appeared in court were: Redin Fouad, 21; Mohammed Faraj Yawar, 32; Atah Hussain Mohammed, 26; Kadir Ahmad Pasdally, 33; Yagdar Ali Omer, 24; Ari Mahmoud Ali, 25; Karwan Ojman Mohumud Amin, 25; Dara Abdulrahman Hassan, 22; and Aram Mohamed Salih, 21.