Trish Murphy, formerly of NOAA, takes a secchi depth reading to determine water turbidity and how it relates to the ability of the fish to recognize the sampling gillnets.

Image ID: r0022613, NOAA's Restoration Center Collection
Location: Poplar Island, Talbot County, Maryland
Photo Date: 1995-1996
Credit: NOAA Restoration Center, Chris Doley

• High Resolution Photo Available