prilliscutes to bedtag 2. In 1919 a researcher by the name of Dahl wanted to estimate the number of trout in a Norwegian lake. The trout were subject to fishing so it was important to know how big the population was in order to manage the fish stock. He captured and marked 109 trout in his first sample. A few days later, he caught 177 trout in his second sample, of which 57 were marked. Use the Lincoln index (on the previous page) to estimate the total population size: Size of first sample: Size of second sample: Number marked in second sample: Estimated total population: 3 Discuss.com

Aquaculture Science
3rd Edition
ISBN:9781133558347
Author:Parker
Publisher:Parker
Chapter10: Feeds And Feeding
Section: Chapter Questions
Problem 21SA
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2. In 1919 a researcher by the name of Dahl wanted to estimate the number of trout in a Norwegian lake. The trout were
subject to fishing so it was important to know how big the population was in order to manage the fish stock. He captured
and marked 109 trout in his first sample. A few days later, he caught 177 trout in his second sample, of which 57 were
marked. Use the Lincoln index (on the previous page) to estimate the total population size:
Size of first sample:
Size of second sample:
Number marked in second sample:
Estimated total population:
3. Discuss some of the problems with the mark and recapture method if the second sampling is:
Left too long a time before being repeated:
(b) Too soon after the first sampling:
4. Describe two important assumptions being made in this method of sampling, which would cause the method to fail if
they were not true:
(a)
(b)
5. Some types of animal would be unsuitable for this method of population estimation (i.e. would not work).
(a) Name an ani
Transcribed Image Text:116 2. In 1919 a researcher by the name of Dahl wanted to estimate the number of trout in a Norwegian lake. The trout were subject to fishing so it was important to know how big the population was in order to manage the fish stock. He captured and marked 109 trout in his first sample. A few days later, he caught 177 trout in his second sample, of which 57 were marked. Use the Lincoln index (on the previous page) to estimate the total population size: Size of first sample: Size of second sample: Number marked in second sample: Estimated total population: 3. Discuss some of the problems with the mark and recapture method if the second sampling is: Left too long a time before being repeated: (b) Too soon after the first sampling: 4. Describe two important assumptions being made in this method of sampling, which would cause the method to fail if they were not true: (a) (b) 5. Some types of animal would be unsuitable for this method of population estimation (i.e. would not work). (a) Name an ani
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