Offshore LENONS project

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The R/V John J. Freidhoff was used to collect samples at 20m, 10m, 5m, and 2m.

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Student Steve Sliwinski and Mark Clapsadl head out to their first site in Huron, Ohio.

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Kit Hastings at the wheel.

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Secchi disk to measure water clarity.

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YSI multiparameter sonde for water temperature and dissolved oxygen.

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Mark Clapsadl puts the sonde into the water and starts taking a profile.

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Mark Clapsadl recording water chemistry data.

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Mark Clapsadl recording water chemistry data.

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Mark Clapsadl recording water chemistry data.

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Mark Clapsadl wraps the sonde in a towel to keep the sensors damp between stations.

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Steve Sliwinski and Dr. Alicia Pérez-Fuentetaja sorting our bottles for the day.

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The water sampling tube is lowered into the water and cinched to grab a composite water sample.

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Then it is emptied into a clean bucket for subsampling; repeat until the bucket is full enough.

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Attaching a filter to a syringe; some of the water samples needed to be filtered.

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Filtering a small amount of the composite sample.

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Putting the filtered water into a sample bottle.

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Filling sample bottles with unfiltered water.

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Amber bottle for chlorophyll analysis.

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Preserving a phytoplankton sample with an iodine solution.

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Steve Sliwinski prepares the zooplankton net for a vertical tow.

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Steve Sliwinski checks the initial flowmeter reading.

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Dr. Pérez reads the final flowmeter reading.

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Dr. Pérez opens the zooplankton net.

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The zooplankton are rinsed from the bucket into a sample bottle.

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Steve Sliwinski preserves the zooplankton.

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We also do a horizontal tow to get enough zooplankton to fill a small bottle.

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We need to sample a lot of water to fill some cubitainers. First we use the filter housing without a filter.

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We pump water through the tube.

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Mark fills two cubitainers with unfiltered water.

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Kit Hastings installs the filter.

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Kit Hastings and Steve Sliwinski preparing to fill the cubitainers.

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Steve Sliwinski turns on the pump.

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Filling the cubitainers with water for a reaction.

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Putting in the reagents to create a floc.

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Mixing the reagents and water.

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Mark Clapsadl setting an Eckman grabber to collect benthos.

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The benthic sample is emptied into a net.

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Kit Hastings washes the excess sediment from the net while Steve Sliwinski does the next grab.

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Kit Hastings holds a sample that's ready to be transferred to a sample bag.

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Dr. Pérez using the sample tube.

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Steve Sliwinski using the sample tube.

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Kit Hastings using the sample tube.

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Steve Sliwinski is ready to fill the cubitainer.

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Mark Clapsadl runs the YSI in the rain.

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Steve Sliwinski works in the rain.

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Mark Clapsadl using the YSI on a sunny day.