California-Nevada Fish Health Center
Pacific Southwest Region


Histology is an important field of fish health that can often detect subtle conditions or early signs of disease not easily recognized on gross examination. Changes at the cellular level and in the function of key organs are the first indications of mal-adjustment to stressors that may eventually lead to poor health or disease. Histology in the Wild Fish Survey supplements general observations and pathogen screening of wild fish populations. Special projects such as water quality and contaminant studies can be augmented with histology to provide better insight into the environmental and/or physiological demands presented to fish in their natural environment.

Last updated: June 18, 2014