The Largescale Four-Eyes (Anableps anableps) is a freshwater and brackishwater fish in the Anablepidae family of four-eyed fish.
The Largescale Four-Eyes is an elongated fish with prominent eyes. It is greyish to reddish-brown in colour. It has a paddle-shaped tail.
It does not really have four eyes. Each eye has a horizontal band of tissue that splits the skin lengthwise (horizontally) into two lobes. Each lobe has its own pupil with its own vision. Therefore, there are four pupils, not four eyes. This means that, when it lies on the surface of the water, one lobed pupil looks at the sky and the other lobed pupil looks underwater. So, it can see above and below the surface of the water at the same time.
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What is a lagoon?
A lagoon is marine water or freshwater that is near to, but separated from, a larger body of water by a natural barrier or several natural barriers. It occurs in oceans and near the coast. Some lagoons have brackish water, which is a mixture of sea water and freshwater from a river mouth at the coast.
The natural barrier between the small and large body of water can be a reef or a sandbar.
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What are euryhaline and stenohaline organisms?
Euryhaline organisms can adapt to a wide range of salinities. Salinity is the level of salt in water.
Therefore, euryhaline organisms can live in freshwater, brackish water (light salt water), and salt water.
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The Madagascar Teal (Anas bernieri) is a bird. It is also known as the Bernier’s Teal.
The Madagascar Teal is mainly brown with a reddish beak. Its legs and feet are reddish-orange. Males and females look similar.
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What’s the difference between freshwater, saltwater, and brackish water?
Freshwater is water, without salt or other minerals, that occurs naturally, such as in rivers, streams, ice caps, glaciers, bogs, ponds, and groundwater.
Saltwater is sea water that occurs in the ocean and in marine environments, such as salt lakes, salt pans, and brine pools. It is salty. It has a high salinity level.
Brackish water occurs in areas where the seawater from the ocean meets the freshwater from a river, such as in estuaries. An estuary is on the coast, where a river meets the sea. It is a transition zone.