2. Do background research – Utilizing at least one scholarly source, describe how variations in dissolved oxygen content in a body of water can affect fish populations. Answer = “Oxygen depletions are the most common cause of fish kills in ponds. (Aquaplant, 2014).” Based on my observation of the chart and what I read, the higher the dissolved oxygen levels the number of fish drops. Dissolved oxygen levels can also cause fish to suffocate and be more susceptible to diseases.
Global warming will only cause an increase in these issues along with additional problems that could eventually end this civilization, if we don’t work hard on improving our efforts on managing all the different types of pollution and waste that contributes to this major concern. 2. Water Issues, was an extremely important area of local environmental concern this summer. 70% of our planet’s surface is water, but most of that is salt water. Freshwater though essential to life, is one of the rarest and most endangered resources on our progressively fragile planet.
Eating about two servings of fish per week provides healthy amounts omega-3 fatty acids that can help to lower cardiovascular disease. Although they have such great health benefits to us, we are putting many of the popular fish species we enjoy, such as salmon, tilapia and haddock, at risk for endangerment and environmental malpractice. There are many differences between farm raised and wild caught, but they both can be done in responsible manors that won’t harm the environment in an adverse way. It can be hard at times for suppliers to follow through with proper fishing technics especially when regulation is almost non-existent. Much of the shamming of improper fishing techniques is held against farm raised fish and the conditions in which they are raised.
The ocean dwellers are virtually helpless, and they will ultimately have to suffer the consequences that have been created mainly by humans. Over the past few years there has been a significant change in marine life. Coral reefs are becoming endangered due to high carbon dioxide levels and effects of warming. Large predators, small fish, and other organisms make their homes in coral reefs. A process called mass bleaching has also become a danger to coral reefs.
Fish are very sensitive to chlorine and other impurities in tap water. Allowing the tap water to sit out for a few days will rid it of any impurities and you will then be able to fill up your aquarium. The items discussed are very easy to acquire and even afford, but can make the difference in life and death for your fish.
Aquatic environments are generally split into three categories; fresh water, marine (salt water) and estuarine (a combination of salt and fresh water). The organisms that live in each of these environments have specific adaptations that allow them to respond to changes in their surrounds. Fish generally prefer either fresh water or salt water and are unable to cope with a change from one to the other. For example the cells in fresh water fish are saltier than the surrounding water, so due to osmosis (the diffusion of water through a semi-permeable membrane) water is constantly flowing into its body. For this reason fresh water fish require very efficient kidneys to remove all of the extra water, and methods of maintaining and collecting the salt lost through urination.
The most important species are either fully exploited and are being managed to achieve a sustainable yield, or have been overexploited and are now being managed to allow recovery. Overfishing occurs when human fishing activities reduce fish stocks below an acceptable level. This can occur in any body of water from a pond to the oceans. There are three recognized types of overfishing: growth overfishing, recruit overfishing and ecosystem
Elevated pH can in turn ‘blind' organisms that rely on perception of dissolved chemical cues for their survival by impairing their chemosensory abilities (Figure 3) (Turner & Chislock 2010). When these dense algal blooms eventually die, microbial decomposition severely depletes dissolved oxygen, creating a hypoxic or anoxic ‘dead zone' lacking sufficient oxygen to support most organisms. Dead zones are found in many freshwater lakes including the Laurentian Great Lakes (e.g., central basin of Lake Erie; Arend et al. 2011) during the summer. Furthermore, such hypoxic events are particularly common in marine coastal environments surrounding large, nutrient-rich rivers (e.g., Mississippi River and the Gulf of Mexico; Susquehanna River and the Chesapeake Bay) and have been shown to affect more than 245,000 square kilometers in over 400 near-shore systems (Diaz & Rosenberg 2008).
Water quality and contamination SCI 207: Dependence of man on the environment 7 April 2014 Water Quality and Contamination Introduction Body Paragraph #1 - Background: All of mankind relies on potable public or private drinking water supply to survive. “Testing of water quality on a regular basis is, therefore, an important part of maintaining a safe and reliable source” (Borah, Bhuyan, & Sarma, 2010). As stated by the World Health Organization (WHO), “Catastrophic events can result in periods of very degraded source water quality and greatly decreased efficiency in many processes, or even system failure, greatly increasing the likelihood of a disease outbreak (2011). Body Paragraph # 2 - Objective: The purpose of this study is to show the importance of having a uncontaminated water supply. People may contract serious illnesses or even worse, die from drinking contaminated water.
Ishan Joshi 1 Mercury Contamination in Aquatic Ecosystem Term Paper [Chemical Oceanography-4126] Ishan Joshi Department of Oceanography and Coastal Sciences Abstract Mercury is the unique and toxic element that resides in small amount in the atmosphere, the hydrosphere and the biosphere. After industrial revolution and increased anthropogenic activities, concentration of elemental mercury and its compounds has increased about 3-4 times in the atmosphere which resulted life-threatening and devastating influence on marine and terrestrial ecosystem. Increment in atmospheric mercury concentration resulted elevated mercury loading in the upper ocean. More than a half of the human population depends on salt water and fresh water fish for their daily diet. Since fish is the main target of mercury contamination, humans are at a lifethreatening risk by toxic effects mercury.