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To prevent a newly built dam on the Chiff River from blocking the rout

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Re: To prevent a newly built dam on the Chiff River from blocking the rout  [#permalink]

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New post 23 Oct 2018, 01:52
VeritasKarishma wrote:
sriramsundaram91 wrote:
I guess my brain is demented. Can anyone help this demented brain understand why option A to be wrong?
I have read the experts reply. I am still not able to digest why A is wrong? Fish that have migrated upstream breeding grounds don't return the chiff river again.
If there were several thousand fishes and if they had already migrated(they would not want to go downstream for some reason). Only a few would have been left. These few would try to migrate using the fish pass thus attributing to the fewer fish that use the fish pass.


Every year, during spawning season, several 1000s of fish swim upriver to breeding grounds.
This happens during every spawning season. If the fish that have migrated do not come back, they do not come back every season. But still 1000s of fish swim upriver every day in every spawning season.

But in this spawning season (the first one after the dam got constructed), only 300 fish are swimming upriver. So either there is a problem with the fish pass or there are fewer fish or something else. Certainly, the new dam has had some impact this season.


I understand now; the fewer fish do not guarantee that there is no problem with the construction of the fish pass.
Simple yet,powerful Idea! Thanks.
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To prevent a newly built dam on the Chiff River from blocking the rout  [#permalink]

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New post 13 Dec 2018, 04:38
I used Pre-thinking technique, Now the issue is that the first thought I had was that there might have been a population decline because once the migration was done the fish never came back to their originating position. In such a scenario why option A is wrong?
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Re: To prevent a newly built dam on the Chiff River from blocking the rout  [#permalink]

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New post 13 Dec 2018, 04:46
amansharma2988 wrote:
I used Pre-thinking technique, Now the issue is that the first thought I had was that there might have been a population decline because once the migration was done the fish never came back to their originating position. In such a scenario why option A is wrong?


Note the tone of the argument:

Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season. But in the first season after the project's completion, only 300 per day made the journey.

During spawning season, several 1000 fish used to swim upriver as a habitual thing. It used to happen in every spawning season. So this was not causing decrease in population. The change happened only after the project's completion.
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Re: To prevent a newly built dam on the Chiff River from blocking the rout  [#permalink]

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New post 26 Dec 2018, 06:00
Thanks GMATNinja and VeritasKarishma for the wonderful explanations. It helped me rule out E to an extent.

I have made up a pictorial visualisation for this question, to understand it properly.
If possible, could you please assess the validity of the understanding as attached :)

My small query is:

There are two scenarios:

Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season

But in the first season after the project’s completion, only 300 per day made the journey.

Here we have FIRST SEASON and SPAWNING SEASON. Are they both same? How?
Attachments

File comment: Pictorial representation of the explanation.
OG_VR_Fish.PNG
OG_VR_Fish.PNG [ 273.32 KiB | Viewed 107 times ]

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Re: To prevent a newly built dam on the Chiff River from blocking the rout  [#permalink]

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New post 01 Jan 2019, 05:47
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rish2708 wrote:
Thanks GMATNinja and VeritasKarishma for the wonderful explanations. It helped me rule out E to an extent.

I have made up a pictorial visualisation for this question, to understand it properly.
If possible, could you please assess the validity of the understanding as attached :)

My small query is:

There are two scenarios:

Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season

But in the first season after the project’s completion, only 300 per day made the journey.

Here we have FIRST SEASON and SPAWNING SEASON. Are they both same? How?


Yes, we are talking about only one season and that is the spawning season. The first season after the dam opens means first spawning season.
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Re: To prevent a newly built dam on the Chiff River from blocking the rout &nbs [#permalink] 01 Jan 2019, 05:47

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To prevent a newly built dam on the Chiff River from blocking the rout

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