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Group of the related Chaetodon fasciatus in the Red Sea. Chaetodon lunula can reach a length of 20 cm (nearly 8 in). [2] These large butterflyfishes have an oval outline, with a pattern of ascending oblique reddish stripes on the flanks and black and white bands over the face and eyes, similar to the "raccoon" mask (hence the common name).
The reef butterflyfish lives on rocky and coral reefs [2] to depths of 60 metres (200 ft). [1] Its compressed body means that it can forage by darting in and out of the coral, the small, protractile mouth is a further adaptation to finding food within the coral.
[3] [4] Each filament contains a capillary network that provides a large surface area for exchanging oxygen and carbon dioxide. Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing countercurrent exchange. The ...
Foureye butterflyfish usually frequent shallow inshore waters, where they feed on a variety of invertebrates, mainly zoantharians, sea anemones, scleractinians, [6] polychaete worms, gorgonians, tunicates, crustaceans and fish eggs. [7] This fish is known for its uncanny ability to swim in and around coral heads and reefs.
Freshwater fish are fish species that spend some or all of their lives in bodies of fresh water such as rivers, lakes and inland wetlands, where the salinity is less than 1.05%. These environments differ from marine habitats in many ways, especially the difference in levels of osmolarity .
A food web is network of food chains, and as such can be represented graphically and analysed using techniques from network theory. [1] [2] Classic food web for grey seals in the Baltic Sea containing several typical marine food chains [3] The fourth trophic level consists of predatory fish, marine mammals and seabirds that consume forage fish.
Fish vision shows adaptation to their visual environment, for example deep sea fishes have eyes suited to the dark environment. Fish and other aquatic animals live in a different light environment than terrestrial species. Water absorbs light so that with increasing depth the amount of light available decreases quickly.
The Arctic cisco (Coregonus autumnalis), also known as Arctic omul (Russian: Омуль), is an anadromous species of freshwater whitefish that inhabits the Arctic parts of Siberia especially Yenisey Gulf.