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Each year, an official estimate of the stock of cod in the

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Each year, an official estimate of the stock of cod in the [#permalink] New post 12 Mar 2007, 20:14
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Each year, an official estimate of the stock of cod in the Grand Banks is announced. This estimate is obtained by averaging two separate estimates of how many cod are available, one based on the number of cod caught by research vessels during a once-yearly sampling of the area and the other on the average number of tons of cod caught by various commercial vessels per unit of fishing effort expended there in the past year—a unit of fishing effort being one kilometer of net set out in the water for one hour. In previous decades, the two estimates usually agreed closely. However, for the last decade the estimate based on commercial tonnage has been increasing markedly, by about the same amount as the sampling-based estimate has been decreasing.

Which one of the following, if true, most helps to account for the growing discrepancy between the estimate based on commercial tonnage and the research-based estimate?
(A) Fishing vessels often exceed their fishing quotas for cod and therefore often underreport the number of tons of cod that they catch.
(B) More survey vessels are now involved in the yearly sampling effort than were involved 10 years ago.
(C) Improvements in technology over the last 10 years have allowed commercial fishing vessels to locate and catch large schools of cod more easily.
(D) Survey vessels count only those cod caught during a 30-day survey period, whereas commercial dishing vessels report all cod caught during the course of a year.
(E) Because of past overfishing of cod, fewer fishing vessels now catch the maximum tonnage of cod each vessel is allowed by law to catch.
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 [#permalink] New post 12 Mar 2007, 20:24
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D seems to be the best answer
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 [#permalink] New post 13 Mar 2007, 02:38
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(D)

If survey vessels count only 30-day survey period and commercial fishing vessels report for the whole of a year, there will be discrepancy in numbers..
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 [#permalink] New post 13 Mar 2007, 06:05
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Same thing works in the previous decade and only discrepancy happens in this decade...


Could someone ellaborate this?
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 [#permalink] New post 13 Mar 2007, 07:36
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I would go with C here.

D is a trap, since this has always been the case and the discrepency has only recently made an appearence...

If however, the fishing companies can locate fish easier, they can fish out a larger precentage of fish, pushing down the actual number of available fish, while (seemingly) increase their catch...after several more years, their yield will begin to fall...but new technology makes sense of the current paradox.
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 [#permalink] New post 13 Mar 2007, 09:08
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I pick C

If they are able to catch fish more easily, they will have more fish, and there will be less fish for the research team to observe

D is wrong because it didnt say that was a new revelation ni the last decade, so we must conclude that they did their estimates scientifically since they are using the same methods they used previous.
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 [#permalink] New post 13 Mar 2007, 09:15
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I will go with D

The decoy I see in C is that it only speaks about the commercial vessels. For all I know the same could be held for Sampling vessel too. They too could use the best technology possible. However choice D clearly presents the fact from both the perspectives.
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 [#permalink] New post 13 Mar 2007, 18:18
The research vessels goal is not to catch as many fish as possible, so the technology wouldnt matter to them

The fisherman will catch a lot more fish with the new technology, therefore there will be less fish in the waters for the research vessel to observe. There will be an inverse relationship.
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 [#permalink] New post 13 Mar 2007, 19:00
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Hey guys, :-D

A challenger to those who answered C or D! :)

I would go with A!!! :shock:

(I thought hard between A and C but decided to go with A)

If fishing vessels often exceed their fishing quotas, then there would be fewer fish remaining for the survey vessels to report. There is an inverse relationship as mentioned in the passage ("However, for the last decade the estimate based on commercial tonnage has been increasing markedly, by about the same amount as the sampling-based estimate has been decreasing.") and fishing vessels catching more and thus leaving less for survey vessels to report explains it.

A weakness here though, is that the fishing vessels can continue to underreport the same amount and thus their estimate based on commercial tonnage can stay the same... :?

(D, I agree appears to be a trap...)
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 [#permalink] New post 13 Mar 2007, 21:01
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defenestrate wrote:
I would go with C here.

D is a trap, since this has always been the case and the discrepency has only recently made an appearence...

If however, the fishing companies can locate fish easier, they can fish out a larger precentage of fish, pushing down the actual number of available fish, while (seemingly) increase their catch...after several more years, their yield will begin to fall...but new technology makes sense of the current paradox.


Nailed it! The argument states that the research vessels do a once-yearly sampling of the area. D only clarifies the duration of that sampling period (= 30 days)
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 [#permalink] New post 13 Mar 2007, 21:29
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One and only (C)
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"Education is what remains when one has forgotten everything he learned in school."

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 [#permalink] New post 15 Mar 2007, 10:24
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Well i will go with C. I agree that D is a trap (a brutal one).

Cheers!
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 [#permalink] New post 15 Mar 2007, 10:38
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I also go with C as it explains why the discrepancy is in the estimate and commercial tonnage is happening now. Because of advanced technology commercial fishing vessels can catch more cod, than the survey vessels. D cannot explain why the discrepancy happens now, because earlier there were better agreement between these two methods
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 [#permalink] New post 15 Mar 2007, 12:52
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C. Technology --> More fish for commerical boats --> bigger discrepency between commercial and survey.
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 [#permalink] New post 15 Mar 2007, 14:22
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C.
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Re: CR- Fishing [#permalink] New post 15 Mar 2007, 15:05
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C.

Method 1 gets less and not change --> Less cod
Less cod and Method 2 gets more --> method 2 is improved
Re: CR- Fishing   [#permalink] 15 Mar 2007, 15:05
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