Assume there is a certain population of fish in a pond whose growth is described by the logistic equation. It is estimated that the carrying capacity for the pond is 1500 fish. Absent constraints, the population would grow by 170% per year.
If the starting population is given by p0 = 400, then after one breeding season the population of the pond is given by p1 =.
After two breeding seasons the population of the pond is given by p2 =.

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Answer:

The correct answer is  p1 = 898 and p2 = 1020.

Explanation:

This is a logistic growth problem and will utilize the following formula:  

[tex]Pn = P_{n-1} + r (1- \frac{P_{n-1} }{k} ) P_{n-1}[/tex]

Given ;

r = 1.7

k = 1500

Po = 400

then,

[tex]Pn = 400 + 1.7 (1- \frac{400 }{1500} ) 400[/tex]

= 400 + 1.7 (293)

= 400+ 498

P₁= 898

Similarly,

[tex]P₂= P_{2-1} + r (1- \frac{P_{2-1} }{k} ) P_{2-1}[/tex]

= [tex]Pn = 400 + 1.7 (1- \frac{898 }{1500} ) 400[/tex]

= 1020

Thus, the correct answer is  p1 = 898 and p2 = 1020.

The population of fishes in the first generation will be 898 and in the second generation the population will be 1020.

Carrying Capacity:

It is the maximum number of individuals in a system at a certain time.

The logistic growth formula,

[tex]\bold {P_n = P_o + r (1- \dfrac {P_o}{k}) P_o }[/tex]

Where,  

r - rate of population increase = 1.7  

k- carrying capacity of the pond = 1500  

Po- initial population = 400

Put the values in the formula,

[tex]\bold {P_n =400+ 1.7 (1- \dfrac {400}{1500}) 400 }\\\bold {P_n = 898 }[/tex]

In second generation,

Po = 898,

So,

[tex]\bold {P_n' = 898+ 1.7 (1- \dfrac {898}{1500}) 898}\\\\\bold {P_n' = 1020 }[/tex]

Therefore, the population of fishes in the first generation will be 898 and in the second generation the population will be 1020.

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