TEACH Calendar of Events
What's going on in your neighborhood this month? Meet other people and learn together at recreational and educational events! Our new dynamic calendar is updated daily with current educational events.
3 | What's in your landing net?
Fish make up more than half of the known vertebrate species in the world. Currently, there are about 50,000 known species of fish, with new species being identified every year! Despite the fact that freshwater rivers and lakes represent only about 1 percent of the world's water, more than 41 percent of all fish species are found there. Some fish, less than 1 percent, live in both fresh and marine environments. There is a higher proportion of fish species in freshwater environments because these environments are often more isolated, which leads to a higher rate of speciation.
Fish Anatomy 101
Most fish are ectotherms, meaning that their body temperature is strongly dependent on the environment. Consequently, water temperature is one of the most important physical factors affecting the behavior, physiology and distribution of fish. Fish are sometimes classified as either cold-water or warm-water species. Cold-water species, such as the brook trout, have optimal development and growth in cold temperatures. They can withstand cooler temperatures, but warmer water can be lethal to them. In contrast, the bluegill sunfish lives best at warmer temperatures.Comparing common trout and salmon species
Related site: Trout and Salmon Identification Guide
Chinook Salmon (Oncorhynchus tshawytscha)
Coho Salmon (Oncorhynchus kisutch)
Lake Trout (Salvelinus namaycush)
Rainbow Trout, or steelhead (Oncorhynchus mykiss)
Siscowet, or fat lake trout (Salvelinus namaycush siscowet)
Graphics: Fish anatomy, Canada's Aquatic Environments (University of Guelph, Ontario); Chinook and Brown Trout, copyright ŠJoseph Tomelleri; Siscowet, Minnesota Sea Grant.