Thus, oil that would normally rise to the surface of the water was emulsified into tiny droplets and remained suspended in the water and on the sea floor.[194] The oil and dispersant mixture permeated the food chain through zooplankton.[191][195][196] Signs of an oil-and-dispersant mix were found under the shells of tiny blue crab larvae.[197] A study of insect populations in the coastal marshes affected by the spill also found a significant impact.[198] Chemicals from the spill were found in migratory birds as far away as Minnesota. Pelican eggs contained "petroleum compounds and Corexit".[129] Dispersant and PAHs from oil are believed to have caused "disturbing numbers" of mutated fish that scientists and commercial fishers saw in 2012, including 50% of shrimp found lacking eyes and eye sockets.[199][200] Fish with oozing sores and lesions were first noted by fishermen in November 2010.[201] Prior to the spill, approximately 0.1% of Gulf fish had lesions or sores.