Rahway River migrations. Fish ladders are inundated structures with small underwater steps that allow fish to navigate around a dam and continue their migration. Other approaches include removing obstructions that are inoperative or no longer serve their purpose, or improving water quality and reducing debris that obstructs passage. The fish targeted for upstream passage at the Rahway River Water Supply Dam are alewife (Alosa pseudoharengus), blueback herring (Alosa aestivalis), gizzard shad (Dorosoma cepedianum), white perch (Morone Americana) and the endangered American eel (Anguilla rostrate). Alewife and blueback herring are collectively referred to as river herring due to their similarity in appearance, range,
Fish River (Alaska) Fish River (Alaska) The Fish River is a waterway in the U.S. state of Alaska. The river rises in the Bendeleben Mountains and flows south to Golovnin Lagoon, before emptying into Golovnin Bay, Norton Sound, and the Bering Sea. The basin formed by the Fish River is known for its placer gold deposits, and in particular, the Niukluk River and its tributaries; production from this tributary valley is reported to be more than from any other place in the region. A galena mine existed from the sea, worked on occasion by a San Francisco corporation with a few hundred tons