Fish of the California Delta

The three-spined stickleback, Gasterosteus aculeatus, is a fish native to most inland coastal waters north of 30°N. It has long been a subject of scientific study for many reasons. It shows great morphological variation throughout its range, ideal for questions about evolution and population genetics. Most populations are anadromous (they live in seawater but breed in freshwater or brackish water) and very tolerant of changes in salinity, a subject of interest to physiologists. It displays elaborate... less ↑

The yellow perch (Perca flavescens), commonly referred to as perch, is a freshwater perciform fish native to much of North America. The yellow perch was described in 1814 by Samuel Latham Mitchill from New York. Yellow perch are closely related, and morphologically similar to the European perch (Perca fluviatilis); however, the two are recognized as independent species based on anatomical and genetic differences. Other common names for yellow perch include American perch, coontail, lake perch, raccoon... less ↑