Two biological hotspots were found in Milwaukee’s outer habror: The Green Breakwall, located by the outer harbors north gap, and Summerfest Lagoon/Discovery World. Both host a highly diverse fishery. Small mouth bass and rock bass feed on hemimysis and round goby at the Green Breakwall throughout the summer with salmon and trout using the site as a staging area for their fall spawning runs. Bass, panfish, and northern pike are common in Summerfest Lagoon and Discovery World year round. Brown trout can even be caught here through the ice in the winter.