Dams Cause Evolution In Fish

This essay will be investigating the extent to which people must reduce overfishing in order to preserve animal populations. Overfishing can be defined as ‘the catching of too many fish resulting in the deterioration of marine biodiversity and food systems, as fish populations decline.’ This essay will overlay the perspectives of Hong Kong, the perspective of Japan, and finally the significance of overfishing on me and my family. Overfishing is a very important discussion because it has become a global issue, resulting in collapse of the entire marine ecosystem. Fish is also one of the main sources of food around the world. The collapse of the marine ecosystem would result in the a massive amount of loss in fish stocks, resulting in the loss of business and the starvation of many people around the world that rely on fish as their major supply of food.

According to world wildlife organisation, overfishing occurs when more fish are caught than the population can replace through natural reproduction. Gathering as many fish as possible may seem like a profitable practice, but overfishing has serious consequences. The results may not only affect the balance of life in the oceans, but also the social and economic well-being of the coastal communities who depend on fish for their way of life. According to the research world wildlife organisation, 1.6% of the world’s oceans have been declared as marine protected areas (MPAS), and 90% of existing MPAS are open to fishing. MPAS are important because they protect habitats such as coral reefs from destructive fishing practices.

This decrease affects the ecosystems in which the salmon reside as well as puts the future of Pacific Salmon as both a species and a food source in danger. Using the key ideas from Garret Hardin’s essay “The Tragedy of the Commons,” the depletion of commercial salmon fisheries must be examined. Ultimately, programs for habitat restoration

Climate change has been clearly shown to affect Pacific salmon, and it has been generally seen to diminish salmon populations. In the Pacific Northwest, numerous salmon populations have been labeled as endangered under the Endangered Species Act. This is due to climate change warming the ocean, increasing sea levels, and changing flow patterns. It is predicted that salmon populations are only going to continue decreasing due to these changes in their environment. However, some researchers are arguing that Pacific salmon populations are actually going to show an increase in population size, and this is due to an increase in ocean temperatures causing a bottom-up effect that increases resources lower on the food chain, therefore benefitting salmon

Congress passed the Fishery Conservation and Management Act, which stopped foreign fishing vessels. So in 1976 we stopped foreign vessels, but what about our own vessels who is stopping the U.S. from hunting down the fish. “I am concerned about the air we breathe and the water we drink. If overfishing continues; many of these species will disappear off the face of the earth.” Wouldn’t it be sad if the great grandchildren from this generation had never seen a

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. The largemouth bass reproduces in the spring.

Disturbances like boat traffic, flowing water or wind can decrease the growth of duckweed (Newman, 2013). However, growing in undisturbed water sometimes causes the duckweed to pile up in layers, and often the bottom layer will be cut off from sunlight and will die because they were unable to photosynthesise (Newman, 2013). A thick cover of duckweed also prevents sunlight from reaching other organisms in the water and stops the growth of algae, which decreases carbon dioxide production from algal respiration, which can decrease the pH levels of the water (Newman, 2013). Complete coverage of the water will result in oxygen depletions that will kill

One study from 2015 about the long-term effects of the oil spill in the Gulf of Mexico from the Canadian Journal of Fisheries and Aquatic Sciences, projects a loss of more than 22,000 jobs by 2020, as a result of the impacts to businesses that rely on heathy fisheries. This conclusion also leads to an upset in tourism and recreational activities. As suggested by the Third R&D Forum on high-density oil spills, "sunken heavy fuel oil may have significant impact on seabed resources and fishing and mariculture activities." Oil soaked sands and water often result in restrictions from swimming and boating in an area, thus giving people concerns that their heath may be compromised, deterring people from vacationing. Therefore, even hotel and restaurant businesses who make their income from recreational activities and scenery in the coastal

The Biotope Aquarium Explained In a biotope aquarium, the aquarist attempt to simulate a natural habitat, assembling fish species, plants, water chemistry and decorations found in that specific ecosystem. A “true” biotope should be a mirror of a natural habitat. There are many good reasons for setting up an aquarium that simulates a natural habitat. Those of us who have done everything, bred everything and kept most fish might simply want a new challenge. Another good reason to setup a biotope aquarium is to see the fish interacting in their “natural” environment which is completely different from what you will see in a community setup.

Sedimentation and pollution in the streams or rivers causes effecting the life duration and quality of fish and other species. Land degradation are also reducing the water holding capacity of soil on the contrary, increased by flooding and leaching of water and nutrient losses mainly as nitrate form. The other substantial change in land usage is the maintaining of sustainability. According to FAO statistics, 28% of the total earth surface have any limits on its use for agriculture while 28% is too dry, 23% has chemical imbalances, 10% is too wet, 6% is permanently frozen, and remaining 22% the soil is to shallow for use as arable land. Altgouhg there are some discussions about the renewable subject of soil today, generally if the soil formation rate exceed the degredation rate, soil is accepted as renewable, on the contrary the degredation surpasses the formation, soil is accepted as

These cycles are varied and generally not well understood. The dramatic shift in numbers of returning fish, once thought to be primarily caused by harvest levels, spawning escapements, and various survival factors in freshwater habitats, are now known to be affected by cyclic, climatic and environmental fluctuations during the marine life history of salmon (Francis and Hare, 1994; Mantua et al.,1997). “Since 2007, Alaskans have suffered from

Finally, changes in environmental conditions are also responsible for the collapse of the East Coast Fishery. Water temperatures have dropped and ocean salinity levels have changed, causing fish to change their migratory routes, and avoid areas that are changing. People have suggested that the increase in the seal population has reduced the amount of fish because greater quantities of seals eat greater quantities of fish. In conclusion, a number of theories such as, overfishing, destructive fishing practices, and changes in natural conditions explain why the East Coast Fishery has

The lecturer and the reading passage offer two theories to explain why the sea otter population is in rapid decline. The two theories are predation theory and pollution theory. The professor argues predation is the more likely cause than pollution because of the absence of dead sea otters washing up on shores. However, the reading passage attributes the decline of the sea otters population based on evidence of increased ocean contaminates leading to greater vulnerability to infections. Also, the lecturer argues that orcas are likely factors in the population decline of the sea otters because of the scarcity of their usual prepay.

This can be a problem when there are fertilizers, pesticides, herbicides, pet waste, oil, and other pollutants on the ground that can get washed into the storm drain. When these pollutants are on impervious surfaces that do not allow soil to soak and filter contaminants out, they go into storm drains. Pollutants in the Puget Sound can be harmful to marine life. According to King County, less than half of salmon and steelhead stocks in the Puget Sound are healthy (“What is Stormwater Runoff?”). Many people rely on fish in this area for food, business, and recreation.

This has created a big controversy over what should be built on the river. The west wants to build damns to create reservoirs for the fish to live in, while the east want the river to be left alone so the barges can travel more easily on the river. The reservoirs that are created by putting damns on the river are also used as a water supply because the river flows through a semi-arid climate. If these reservoirs are not preserved then the fish population will go down, which will cause the recreational use of the reservoirs to go down. The reservoirs also supply water to people and to farmland, so if the reservoirs are not preserved then that area would have to find somewhere else to get its