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English: 7x speed timelapse video of fish melanophores responding to 200μM adrenaline. Melanophores are cells found on the skin and/or scales of many aquatic vertebrates including fish and amphibians. They are large cells which contain many dark pigment particles called melanosomes, made dark by the presence of the pigment melanin.
A new study found that some members of an octopus species hunt cooperatively in groups with fish. Video shows octopuses punching their companion fish to keep them on task and contributing to the hunt.
A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians.
Like other fish, sharks extract oxygen from seawater as it passes over their gills. Unlike other fish, shark gill slits are not covered, but lie in a row behind the head. A modified slit called a spiracle lies just behind the eye, which assists the shark with taking in water during respiration and plays a major role in bottom–dwelling sharks.
Fish anatomy is the study of the form ... External videos; ... because of studies showing that some neurons that initially appeared to fit the description were really ...
The fish is of commercial importance; it is fished internationally and raised in aquaculture in Australia, [14] Singapore, Saudi Arabia, Malaysia, India, Indonesia, Vietnam, Israel, Thailand, the United States, Poland, and the United Kingdom. [citation needed] A Singapore investment firm has invested in an upcoming barramundi fish farm in Brunei.
The guppy (Poecilia reticulata), also known as millionfish or the rainbow fish, [3] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. [4]
The hybrid fish are aggressive and have larger mouths than their bluegill parent. These fish also grow faster than other small mouth fish due to its bigger mouth. Greengills or hybrid bluegills are the most efficient in growth and can reach approximately 2 lbs or 0.91 kg in one year. [33]