Customs officers on Friday said they seized smuggled goods worth HK$100 million during an operation in August and September.
They inspected six boats scheduled to depart to Malaysia, Shanghai, Nansha and Macau, confiscating products including electrical goods, electronic waste, shark fins, frozen meat and bottles of wine.
Three arrests were made in total.
Commander Lui Siu-fai said some of the suspected smuggling might have been in response to demand for luxury goods on the mainland during the upcoming holiday period.
“Is rising demand on the mainland for expensive goods like shark fins and wines for the Mid-Autumn festival causing these cases? We won't rule out this possibility,” he said.
The department said it will keep up its enforcement action and continue to "fiercely combat sea smuggling activities".