This week #DFO had two long days sampling #LakeOntario using our RV Cisco, completing two projects. The first was retrieval of several lost fish telemetry receivers. These #hydrophones listen for #fish implanted with acoustics tags. The crew used a Deep Trekker #ROV to attach a line and haul up the devices missing for 2 years. The crew then circled the lake collecting water to measure primary productivity (#algae growth) to match EPA #plankton sampling for the #GreatLakes binational fieldyear.