What are probable modes of transmission

A newspaper headline reported “Algal Bloom Kills Fish.”
As you read, you find that the algae did not produce toxins. Please explain what actually caused fish death, given that the algae are not toxic? What could have caused the algal bloom?
7) Explain the data from a bioremediation experiment in Table
1 below.
Table 1:
These results were obtained from a bioremediation experiment:

Number of colonies on
Minimal Salts Agar Inoculated with Soil		Agar Inoculated with Soil		Uninoculated Minimal Salts Agar
Without Gasoline	With Gasoline	Without Gasoline	With Gasoline	Without Gasoline
3	33	0	0	0

 
 
8) What is fermentation and how can it be used to preserve foods? Please give specific examples in your explanation.
9) Compare and contrast how a farmer would use Rhizobium versus Bacillus thuringiensis? Are there any other types of microbes the farmer could use for similar purposes?
 
 
 
Figure 1
 
10) Salmonella heidelberg gastroenteritis occurred on three cruises aboard the T.S.S. Festivale. Figure 1 shows on-board clinic visits for diarrheal illness between February 10 and March 3.
a. Explain the incidence pattern shown on the graph.
b. What are probable modes of transmission?
c. What changes would you recommend before the ship books more cruises after March 3?