Suction Sampler (image) Virginia Institute of Marine Science Caption VIMS marine scientist Kathleen Knick uses a suction sampler to count the number of juvenile blue crabs in a Chesapeake Bay seagrass bed. Credit Photo by Rochelle Seitz/VIMS. Usage Restrictions One-time use only. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.