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A fish ladder, also known as a fishway, fish pass, fish steps, or fish cannon, is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration as well as movements of potamodromous species. [ 1 ] Most fishways enable fish to pass around the barriers by swimming ...
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.
In archeological literature, the name Boylston Street Fishweir refers to ancient fishing structures first discovered in 1913, buried 29 to 40 feet (8.8 to 12.2 m) below Boylston Street in Boston, Massachusetts. Reports written in 1942 [1] and 1949 [2] describe what was thought to be remains of one large fishweir, 2,500 years old, made of up to ...
Impounds. Kennebec River. Height. 24 feet (7.3 m) Length. 917 feet (280 m) Edwards Dam was a hydroelectric dam on the Kennebec River in the U.S. state of Maine. It was located in Augusta, Maine, about 40 miles (64 km) upstream from the Atlantic Ocean. Built in 1837 of timber and concrete, it was 917 feet (280 m) long and 24 feet (7.3 m) high.
Fish anatomy is the study of the form or morphology of fish. It can be contrasted with fish physiology, which is the study of how the component parts of fish function together in the living fish. [ 1 ] In practice, fish anatomy and fish physiology complement each other, the former dealing with the structure of a fish, its organs or component ...
Bubble nests, also called foam nests, are created by some fish and frog species as floating masses of bubbles blown with an oral secretion, saliva bubbles, and occasionally aquatic plants. Fish that build and guard bubble nests are known as aphrophils. [1] Aphrophils include gouramis (including Betta species) and the synbranchid eel Monopterus ...
Shoaling and schooling. These powder blue tangs are shoaling. They are swimming somewhat independently, but in such a way that they stay connected, forming a social group. These bluestripe snapper are schooling. They are all swimming in the same direction in a coordinated way. In biology, any group of fish that stay together for social reasons ...
Certain fish, such as white (albacore) tuna, are higher in mercury, and this toxin can build up in your tissues and lead to potential health problems if you aren’t careful with your intake.