Fisheries Infosite

Trough Shell Auckland (West) (MDI9)
Maori name
Scientific name
Mactra discors

Physical characteristics

Trough Shell have a regionally variable maximum size ranging from 63-95 mm.

Life cycle

Trough Shell are broadcast spawners.


Trough Shell are found all around New Zealand coasts at depths of 3-7 m.

Key statistics
Reported commercial catch1 (tonnes)
Quota value estimate2 (NZ$m)
Exports estimate2 (NZ$m)
1 Reported commercial catch is calculated for the 12 month period to 30/09/2025
2 Quota value and exports are calculated pro-rata to reported commercial catch for the 12 month period to 30/09/2025