Endangered Native Atlantic Salmon: Salmon Presentation Project (Not a Final Draft) Salmo salar, most commonly known as Atlantic Salmon, was once native to almost every freshwater river connected to the Hudson River. Due to what people have treated salmon during their history, many species have been endangered and even extinct, this includes the Native Atlantic Salmon. When people first came to Maine, Atlantic Salmon was the main source of food to eat. The population was still very steady then, but it wasn 't until the early 1800’s that populations decreased.
Channa Argus, commonly known as the northern snakehead, is one of the many invasive species around the world. This species is a top level predator and was introduced to several American states in 2002, but its natural habitat is based in southern and eastern Asia. Northern snakeheads were transported to the waters of America by being sold from pet stores and live food fish markets, followed by being released into the wild. The northern snakehead fish threatens and competes for the native species’ resources and habitat.
If a lake is cut from the ocean and has no large fish as predators (only dragonflies), then the sticklebacks will have a better chance at surviving and reproducing because the sticklebacks will be better adapted to the environment (presence/absence of a pelvic bone) and have little to no predators. The hypothesis was supported.
The largemouth bass have the ability to hide from their prey and provide protection against their predators through the process of abundant vegetation. Their surroundings is usually made up of clears waters so that they can use their vision to identify their prey. The range size in most environments is usually no greater than three meters. (Hannon, 1996; Iguchi and Matsuura, 2004) The largemouth bass is dioeciously, meaning they have separate sexes in reproduction, male and female.
Fish use the grass for shelter, to hide and protect themselves. Next in the food chain are copepods, which are very small organisms in the animal community, which are mostly referred to as zooplankton. These zooplankton consume the algae and bay grass. The next link in the food chain are anchovies. Anchovies consume the zooplankton.
For many it’s a first pet, a gift from family, something you won as a prize at a carnival, but for Canadian residents the familiar orange goldfish everyone knows and loves is becoming a serious problem. Some flush them in a hurry because they no longer want to take care of them, others commit them to a porcelain vortex because they believe their beloved fish has passed, and the Canadian Government is issuing a warning now to citizens of Canada to stop flushing their fish.
The stickleback fish have gained much attention from evolutionary biologists because of their historic ability to adapt to conditions that were not favorable and to survive successfully in them. They are also able to give researchers insight into how evolution occurs in other organisms. The stickleback normally spawns in freshwater but lives in the salt-water ocean. Long ago when ice melted and receded, the fish were given new possible places to inhabit and they did, expanding their spawning locations to newly formed streams. Eventually, though, the streams were cut off from the sea and the once salt-water sticklebacks were faced with the problem of being stuck in freshwater with no way to get out.1 The presence of sticklebacks in freshwater lakes today shows that somehow the fish were able to still survive even though they were in unfavorable conditions. The question is: how did they do it?
Another type is the pink salmon. Pink salmon are considered the smallest of all pacific salmon. They weigh usually between three decimal five and five pounds and are on average twenty to twenty five inches long. Adults have bright greenish-blue and silvery skin, small scales, and pink flesh. They develop black spots when going to freshwater.
The sliver dollar is a peaceful schooling species that spends most of their time in the mid- to upper level of the water. The sliver dollar is medium sized. It is a fresh water fish that is natively found in the slow-moving rivers of South America. Metynnis argenteus is a very popular fish and is found in artificial aquariums all around the world. The silver dollar is generally quite sociable to find.
Bass are a predatory fish, this means that they have to eat other living animals to survive. To hunt, bass will hide in structure, such as a submerged log, or some grass and ambush their prey. When their prey swims by the fish will swim out quickly and eat the food. Bass will eat anything that swims, they will eat minnows, crawfish, frogs,worms and even mice and ducklings that fall into the water. Bass will also eat other fish and sometimes lizards that fall into the water.
They also ate oysters and clams. Occasionally they would eat meat such as deer and bear, but the fish was the main source of food in their diet. The men were in charge of hunting and catching the fish. They used nets, spears and traps to catch their food. The women gathered oysters, clams and berries.
Daphnia are very abundant organisms in freshwater lakes. They tend to live in the upper algae rich portion of the water, feeding on phytoplankton, bacteria and decaying organic matter. Daphnia and bosmina both serve an essential role in he food chain in most lakes, serving as a resource for numerous predators. Trout tend to feed on small crustaceans like daphnia and dosmina. Trout are visual predators and therefore feed on the larger daphnia thus providing bosmina a competitive
Bilbies are omnivores, they eat things such as seeds, spiders, insects and their larvae, bulbs, fruit, fungi and small animals. They mostly live on their own but sometimes live in small groups of up to 4. Since European settlement in Australia the Greater Bilbies population has decreased from