which is the following contributed most to fish population dying during the 1970?1. salt 2. toxic waste 3. predators 4. mercury 5. iodine
In Australia, 14 percent of fish kills were due to low levels of O2, 8 percent due to pesticide/toxic waste, and the other causes lessor.
http://www.fisheries.nsw.gov.au/__data/assets/pdf_file/0017/5057/nsw-fishkill.pdf
In the early 1970's, the James river had a major long term fish kill due to toxic waste, this caused a lot of public attention on clean water, and focusing on point source contimanations.
Toxic waste
To determine which factor contributed most to fish population decline during the 1970s, we need to analyze the information available. Here's how you can go about finding the answer:
1. Research: Start by conducting online searches or consult reliable sources, such as scientific articles, reports, or books. These sources will provide valuable information on the various factors affecting fish populations during that time.
2. Evaluate information: Look for reputable sources that provide data, scientific studies, or expert opinions on the factors mentioned: salt, toxic waste, predators, mercury, and iodine. Assess the impact of each factor on fish populations during the 1970s.
3. Compare factors: Examine the evidence and statistics available for each factor and analyze their effects on the fish population. Consider factors such as the magnitude of pollution, exposure levels, and the vulnerability of fish species to each particular factor.
4. Determine the most significant factor: Based on the information gathered, identify the factor that had the greatest negative impact on fish populations during the 1970s. It could be one or a combination of the factors listed.
Keep in mind that without specific data or studies, I can't provide an exact answer. However, by following these steps, you should be able to analyze the available information and draw a conclusion on which factor contributed the most to fish population decline during the 1970s.