Suvarna Garge

Freshwater fish

Updated on
Share on FacebookTweet on TwitterShare on LinkedIn
Freshwater fish The Freshwater Fish Quiz
Clutch size  American eel: 500,000 – 4,000,000
Length  European eel: 60 – 80 cm, American eel: 50 cm, Short-finned eel: 90 cm
Mass  European eel: 3.6 kg, Beluga: 1,100 kg
Representative species  Tench, European eel, Beluga, Sterlet, European sea sturgeon

The top 10 best looking freshwater fish


Freshwater fish are those that spend some or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 0.05%. These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. To survive fresh water, the fish need a range of physiological adaptations.

Contents

Freshwater fish 10 Most Colorful Freshwater Fish The Aquarium Guide

41.24% of all known species of fish are found in fresh water. This is primarily due to the rapid speciation that the scattered habitats make possible. When dealing with ponds and lakes, one might use the same basic models of speciation as when studying island biogeography.

Freshwater fish 1000 ideas about Freshwater Fish on Pinterest Cichlids Aquarium

Top 10 aggressive freshwater fish for aquarium


Physiology

Freshwater fish Why Freshwater Fish Are Awesome Facts So Romantic Nautilus

Freshwater fish differ physiologically from salt water fish in several respects. Their gills must be able to diffuse dissolved gasses while keeping the salts in the body fluids inside. Their scales reduce water diffusion through the skin: freshwater fish that have lost too many scales will die. They also have well developed kidneys to reclaim salts from body fluids before excretion.

Migrating fish

Freshwater fish 10 Most Colorful Freshwater Fish The Aquarium Guide

Many species of fish do reproduce in freshwater, but spend most of their adult lives in the sea. These are known as anadromous fish, and include, for instance, salmon, trout and three-spined stickleback. Some other kinds of fish are, on the contrary, born in salt water, but live most of or parts of their adult lives in fresh water; for instance the eels. These are known as catadromous fish.

Freshwater fish httpssmediacacheak0pinimgcom736xe183fc

Species migrating between marine and fresh waters need adaptations for both environments; when in salt water they need to keep the bodily salt concentration on a level lower than the surroundings, and vice versa. Many species solve this problem by associating different habitats with different stages of life. Both eels, anadromous salmoniform fish and the sea lamprey have different tolerances in salinity in different stages of their lives.

Classification

Freshwater fish 13 Best Freshwater Fish For Your Home Aquarium Fish Keeping Advice

Freshwater fish species are usually classified by the water temperature in which they survive. The water temperature affects the amount of oxygen available as cold water contains more oxygen than warm water.

Coldwater

Coldwater fish species survive in the coldest temperatures, preferring a water temperature of 50 °F (10 °C) to 60 °F (16 °C) degrees. In North America, air temperatures that result in sufficiently cold water temperatures are found in the northern United States, Canada, and in the southern United States at high elevation. Common coldwater fish include brook trout, rainbow trout, and brown trout.

Warmwater

Warmwater fish species can survive in a wide range of conditions, preferring a water temperature around 80 °F (27 °C). Warmwater fish can survive cold winter temperatures in northern climates, but thrive in warmer water. Common warmwater fish include largemouth bass, bluegill, catfish, and crappies.

Coolwater

Coolwater fish species prefer water temperature between the coldwater and warmwater species, around 60 °F (16 °C) to 80 °F (27 °C). They are found throughout North America except for the southern portions of the United States. Common coolwater species include muskellunge, northern pike, walleye, and yellow perch

North America

About four in ten North American freshwater fish are endangered, according to a pan-North American study, the main cause being human pollution. The number of fish species and subspecies to become endangered has risen from 40 to 61, since 1989.

References

Freshwater fish Wikipedia


Similar Topics
My Dear Rosy
Eric Bogosian
Joanne Mills
Topics