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Bottom feeder fish name11/16/2023 Lake sturgeon reproduce by swimming around each other in circles and shaking violently the male stops circling when he has released his fertilizer and the female then lays her eggs. They prefer to spawn in temperatures between 55 and 64 degrees Fahrenheit. These sturgeon spawn on clean, gravel shoals and stream rapids, usually from April to June. Females reach sexual maturity at 14 to 33 years, most often from 24 to 26 years of age. Male lake sturgeon typically reach sexual maturity at 8 to 12 years, but may take up to 22 years. The juveniles can be found in the same habitats as adults after a year. It is thought that during late summer, yearlings gather in large schools in shallow river mouths and bays. They are thought to feed on benthic invertebrates like adults. About two weeks after hatching, they disperse downstream with the current for several miles until settling back down upon the river bottom.Īs juveniles, all definitive adult structures, except for gonads, form. The larvae soon become pelagic, remaining far from the surface and bed, and negatively phototactic, or attracted to darkness, while searching for rocky places to hide. Observations suggest lake sturgeon and other fish and invertebrates likely consume some fertilized eggs while on the spawning grounds.Īt hatching, the larvae are barely discernible and are about 10 mm long. The eggs typically hatch after 8 to 14 days. When the eggs are mature, they become olive green, grey or black. Lake sturgeon eggs begin yellowed and are attached to a fatty ovarian mass. They grow quickly during a lengthy juvenile stage. Males typically live for 55 years and females can live for 80 to 150 years. The abundance of prey also plays a large factor in finding a suitable habitat. They are not often far from suitable spawning locations. Juveniles typically inhabit pools greater than about 6 feet in depth, and adults typically live deep in large lakes. These sturgeon often migrate in search of food or suitable spawning locations, or in response to seasonal environmental conditions. This distribution makes sense in that all these areas were linked by the large lakes that formed as the glaciers retreated from North America at the end of the last ice age (e.g., Lake Agassiz, Lake Iroquois). In the east, the species lives in Lake Champlain and in some Vermont rivers, including the Winooski, Lamoille and Missisquoi rivers, and Otter Creek. In the north, it is found in the Hudson Bay Lowland. In the west, it reaches Lake Winnipeg and the North Saskatchewan and South Saskatchewan Rivers. Lawrence River to the limits of fresh water. It occurs in the Great Lakes and the Detroit River, east down the St. This species occurs in the Mississippi River drainage basin south to Alabama and Mississippi. Given that it is a large species surviving by feeding on very small species, its feeding ecology has been compared to that of large marine animals, like some whales, which survive by filter-feeding. Some populations consume fish as a significant component of their diet, particularly since the introduction in the early 1990s of the invasive round goby. Its diet consists of insect larvae, worms (including leeches), and other small organisms (primarily metazoan) it finds in the mud. It extends its lips to vacuum up soft live food, which it swallows whole due to its lack of teeth. The lake sturgeon has taste buds on and around its barbels near its rubbery, prehensile lips. Lake sturgeons can grow to a large size for freshwater fish, topping 7.25 ft (2.2 m) long and 240 lb (108 kg). Four sensory organs ( barbels) hang near its mouth to help the sturgeon locate bottom-dwelling prey. The lake sturgeon uses its elongated, spade-like snout to stir up the substrate and sediments on the beds of rivers and lakes to feed. Like other sturgeons, this species is a bottom feeder and has a partly cartilaginous skeleton, an overall streamlined shape, and skin bearing rows of bony plates on the sides and back. The lake sturgeon ( Acipenser fulvescens), also known as the rock sturgeon, is a North American temperate freshwater fish, one of about 25 species of sturgeon. Acipenser ( Huso) rosarium Duméril 1870.Acipenser ( Huso) richardsoni Duméril 1870.Acipenser ( Huso) rafinesquii Duméril 1870.Acipenser ( Huso) platyrhinus Duméril 1870.Acipenser ( Huso) paranasimos Duméril 1870.Acipenser ( Huso) nertinianus Duméril 1870.Acipenser ( Huso) megalaspis Duméril 1870.Acipenser ( Huso) kirtlandii Duméril 1870.Acipenser ( Huso) honneymani Duméril 1870.
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