Harvesting systems - grouper

Unlike the case with some other species reared in capture-based aquaculture systems, e.g. tunas or yellowtails, the harvesting of groupers is relatively simple (Figure 65). Selective harvesting of groupers weighing 400-600 g is best. A drag net is placed at the farthest end of the pond or cage, and dragged slowly towards the other end in the early morning.

Fish are then transferred to a holding net where grading is carried out; undersized fish are returned to the pond or cage.

Figure 65. Harvesting of groupers in a brackishwater pond in Chonburi, Thailand (Photo: NACA)