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“Fish farming” is now a major source of fish for human consumption. In fish farm

ID: 49738 • Letter: #

Question

“Fish farming” is now a major source of fish for human consumption. In fish farming, ponds of fresh water are stocked with small, young fish and they are allowed to grow for a few months before harvest. One enterprising farmer decided to triple the number of fish in a pond and thus triple his income. Instead of a massive profit, all he got was a lot of dead fish. Why did his fish die when none of the other fish farmers had a similar problem? What is the likeliest answer?

The fish attacked and ate each other

The water became toxic from metabolic waste excreted by the fish

So many fish increased the temperature of the water beyond the maximum temperature at which they can control their body temperature

They could not control the osmotic concentration of their blood

1.

The fish attacked and ate each other

2.

The water became toxic from metabolic waste excreted by the fish

3.

So many fish increased the temperature of the water beyond the maximum temperature at which they can control their body temperature

4.

They could not control the osmotic concentration of their blood

Explanation / Answer

The likeliest answer is:

The water became toxic from metabolic waste excreted by the fish

Increased fish excrement lead to contamination and resulted in the spread of infection and disease among fish thereby causing their death.

2.

The water became toxic from metabolic waste excreted by the fish