Rigs moving out on the lake for the night

Kapenta fishing is big business at Kariba lake; for three weeks every months, the lake is filled with kapenta rigs fishing; in fact, from far away, a newcomer may think there's a big city out there in the dark; only one week over the full moon, there's quite; fishing is not permitted; each rig has at least two generators running, one to lift the net the other for movement of the rig...