Fishing for whitebait in the river Thames

Fishermen fish for whitebait in the river Thames near Greenwich. One man pulls in a fishing net while another rows their boat; behind them a man in a small sailing boat stands ready to put the fish in a barrel.  At this time (1840s) whitebait were caught in a small net with fine mesh attached to a wooden frame, which was lowered from a boat moored in the tideway.