Background: Fish mortality is a parameter used in fisheries population dynamics to account for the loss of fish in a fish stock through death. The mortality can be divided into two types:

Natural mortality: the removal of fish from the stock due to causes not associated with fishing. Such causes can include disease, competition, cannibalism, old age, predation, pollution or any other natural factor that causes the death of fish. In fisheries models natural mortality is denoted by (M).[1]
Fishing mortality: the removal of fish from the stock due to fishing activities using any fishing gear.[1] It is denoted by (F) in fisheries models.

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some polution and disease problems.

Question: Which lake had a higher fishing mortality last year?
Answer: Green lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some polution and disease problems.

Question: Which lake had a lower fishing mortality last year?
Answer: Blue

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some polution and disease problems.

Question: Which lake had a lower natural mortality last year?
Answer: Green lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some polution and disease problems.

Question: Which lake had a higher natural mortality last year?
Answer: Blue lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some pollution, cannibalism and disease problems.

Question: Which lake had more pollution problems?
Answer: Blue lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some pollution, cannibalism and disease problems.

Question: Which lake had fewer pollution problems?
Answer: Green lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some pollution, cannibalism and disease problems.

Question: Which lake had fewer cannibalism problems?
Answer: Green lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some pollution, cannibalism and disease problems.

Question: Which lake had more cannibalism problems?
Answer: Blue lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some pollution, cannibalism and disease problems.

Question: Which lake had more fish disease problems?
Answer: Blue lake

Situation: Two lakes had been stocked with fish two years before.Blue lake had an abundant fish stock because nobody fished there, but Green lake was open for fishing. Blue lake had some pollution, cannibalism and disease problems.

Question: Which lake had fewer fish disease problems?
Answer: Green lake

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a higher fishing mortality?
Answer: Jane's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a lower fishing mortality?
Answer: Mary's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a lower natural mortality?
Answer: Mary's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a higher natural mortality?
Answer: Jane's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a higher water pollution?
Answer: Jane's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a lower water pollution?
Answer: Mary's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a lower fish disease rate?
Answer: Mary's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had a higher fish disease rate?
Answer: Jane's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had more problems with overstocking?
Answer: Jane's

Situation: Mary's lake was full of fish, the lake's environment was very healthy. Mary stopped fishing on this lake five years ago and maintained it properly. Jane's lake had high fish mortality both from fishing and pollution, and disease from overstocking.

Question: Which lake had fewer problems with overstocking?
Answer: Mary's

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake is situated at a higher altitude?
Answer: Silver Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake is situated at a lower altitude?
Answer: Red Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake has a greater fish population?
Answer: Silver Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake has a smaller fish population?
Answer: Red Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake had a lower water oxygen level last year?
Answer: Red Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake had a higher water oxygen level last year?
Answer: Silver Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake had a higher natural mortality last year?
Answer: Red Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake had a lower natural mortality last year?
Answer: Silver Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake had a lower fishing mortality last year?
Answer: Red Lake

Situation: The fisherman had 2 choices: he could go to Silver Lake situated at a higher altitude and fish there; or he could go to Red lake, a few miles further down the road. Both lakes were natural, but Red Lake had a few pollution problems last year, and the oxygen levels in the water decreased, leading to many fish dying. Silver lake was still pristine, untouched by human activities such as pollution.

Question: Which lake had a higher fishing mortality last year?
Answer: Silver Lake