A Planktonic Copepod Crustacean (image) University of Hawaii at Manoa Caption One suspect in the disappearance of cod and other groundfish is the food source for their young: a planktonic copepod crustacean, no larger than a grain of rice. Researchers at the University of Hawaii at Manoa are using a new molecular technique called transcriptomics to determine how copepods are responding to global climate change. Credit Gulf of Maine -- Wikipedia; Calanus finmarchicus -- Patrick Hassett, Ohio University Usage Restrictions For academic and news use. 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.