Histology

Researchers at that MMFS are experimentally determining the impacts of high PCB body burdens on the immunocompetency and disease susceptibility of Pacific herring.

Researchers at the MMFS are studying the immediate and delayed effects of petroleum hydrocarbon exposures to Pacific herring.

Low early marine survival rates of Puget Sound steelhead ( Oncorhynchus mykiss), the state fish of Washington, have contributed to its dramatic population decline and current listing as a “Threatened Species” under the Endangered Species Act. Determining the cause(s) of this elevated mortality remains a primary objective of the Salish Sea Marine Survival Project, a large US / Canada effort...

Using an approach that involves a combination of field- and laboratory-based studies, we are investigating fish health factors that may be contributing to the failed recovery of Pacific herring populations in Prince William Sound, AK. Field studies are providing infection and disease prevalence data to inform the population models, serological data that indicate the prior exposure history and...

In fish, as in humans, an intact epidermis is critical to defense against entry of pathogens into the skin. Macroscopic examination of scale loss is the principal method of evaluating physical damage to juvenile salmonids out-migrating through hydroelectric dams in the Snake and Columbia Rivers, and in fish subjected to capture and handling procedures in locations such as hatcheries, fish bypass...

Fish Parasite - Ichthyophonus hoferi

Fish Virus - Viral Hemorrhagic Septicemia Virus (VHSV)

Species Studied - Steelhead Trout ( Oncorhynchus mykiss)

Species Studied - Pacific Herring ( Clupea pallasii)

Species Studied - Pacific Halibut ( Hippoglossus stenolepis)

A collection of 77 photomicrographs compiled by the late William T. Yasutake, USGS Western Fisheries Research Center, Scientist Emeritus. Individual plates may be downloaded below.