PhD, USF distinguished professor, is lead inventor of Red
Tide Chek, the first hand-held device that can detect red tide in the field.
Red tide is one of Florida’s
greatest environmental, ecological and economic threats. These harmful algal
blooms can cause human health problems and hamper the economy in lost tourism
dollars and damaged fisheries.
“The Florida red tide organism
produces a toxin called brevetoxin that can be released in the air as an
aerosol. Thus, this toxin is particularly troublesome for people with asthma or
other respiratory conditions and causes them to cough and choke. Brevetoxin is
particularly lethal to fish, manatees, dolphins and sea birds,” said John Paul,
distinguished professor at the University
of South Florida College of Marine Science.
Following his successful
creation of GrouperChek, a sensor that catches fake grouper, Paul
is lead inventor of Red Tide Chek. It’s the first hand-held device
that can detect red tide in the field, providing results directly to end users
such as government agencies and businesses. This technology speeds up the
decision-making process in closing beaches and shellfish harvesting beds, along
with determining the cause of a fish kill.
Red Tide Chek can speed up the process of detecting red tide, harmful algal blooms producing toxins that can kill fish and cause respiratory irritation in people.
Red Tide Chek runs on batteries and can measure as many as eight samples
at once. It doesn’t require special training, allowing volunteers to regularly
take and test samples along Florida’s Gulf Coast. Currently, very highly
trained technicians are required to count red tide cells and differentiate them
from similar, nontoxic cells using microscopy.
“Red Tide Chek is relatively inexpensive. The assay is extremely
quantitative and that’s because we use an internal control called IC RNA and
it’s very rapid, usually within 20 minutes we have an answer,” Paul said.
John Paul, PhD uses Red Tide Chek to identify the Florida red tide organism.
Paul has a patent through USF to use nucleic acid amplification to
detect red tide. Red Tide Chek works by extracting ribonucleic
acid (RNA) from cells, targeting the carbon fixation gene, which is specific
to Karenia brevis, the organism that causes red tide. The carbon
fixation gene is amplified to better understand cell growth and concentration,
helping determine the presence of Karenia brevis. Paul collaborated with Kathrine Hubbard of the Florida Fish and
Wildlife Conservation Commission on a grant from the National Oceanic and
Atmospheric Administration (NOAA) for genetic detection of red tide in the
southeastern Gulf of Mexico. Story by Tina Meketa, Photos and
video by Vjollca Hysenlika and Sandra C. Roa, University Communications &