Fishy Consumption lab:
Purpose:
Using the mark-recapture technique, we will try to estimate the size of a population. Will will use the technique and apply it towards many other new population problems and compare it with many other methods to estimate a population.
Backround:
Sampling is one of many ways to find an estimated population size. By counting the number of organisms in a small area, we will be able to estimate the rest in an entire area. Tagging is another way or technique to find an estimated population size. Tagging requires an item called a tag. This item is able to mark an individual in a population. Because of this, we can use the tags to track the everyday actions and status of the individual. After tagging the organism, you will need to let them redistribute themselves. Using the data from the tags and finding the percentage tagged, biologist will be able to estimate the population.
Procedure:
Data:
Using the mark-recapture technique, we will try to estimate the size of a population. Will will use the technique and apply it towards many other new population problems and compare it with many other methods to estimate a population.
Backround:
Sampling is one of many ways to find an estimated population size. By counting the number of organisms in a small area, we will be able to estimate the rest in an entire area. Tagging is another way or technique to find an estimated population size. Tagging requires an item called a tag. This item is able to mark an individual in a population. Because of this, we can use the tags to track the everyday actions and status of the individual. After tagging the organism, you will need to let them redistribute themselves. Using the data from the tags and finding the percentage tagged, biologist will be able to estimate the population.
Procedure:
- Go to the body of water with the fish in it.
- Don't count the number of fish in it yet!
- Have an individual from the group use a net to scoop an amount of fish from the water. Our number of fish scooped: 28
- Count and mark the number of fish removed with a permanent marker and then return the fish back into the water.
- Mix the water well so the fish will redistribute themselves with the other fishes
- One member at a time will need to scoop up another batch of fishes but will only need to count the ones not tagged and the ones tagged. Record the data onto the charts.
- Return the scoop into the water and repeat this 20 times.
Data:
Questions:1. What is the mean (average) of your percent tagged fish from your 20 samples?
22.5%
2. Using the following formula, determine an estimated population for your pond:
Population Size = total number captured x number marked (line #3 above)
/total number captured with mark
123 fish
3. Now, actually count the number of fish in your bowl: fish
106 fish
4. Find your percentage error by using the following formula: %
100 x (Your estimate of population - Actual size of population) / (Actual size of population)
16.0377%
5. What concerns should a biologist have about a species’ habits before (s)he uses this method to approximate
the size of a population?
Some concerns would be the hunting of the species and their migration.
Conclusion: How did you fulfill the purpose? What did you learn?
We fulfilled the purpose using the mark-recapture technique. Using a marker, we marked the fishes. We would then redistribute by mixing the water after dropping them back in. Each scoop represents the recapturing of the fish. Through this lab, I have learned that populations change over time. The population fluctuates throughout the changes the fish go through.
22.5%
2. Using the following formula, determine an estimated population for your pond:
Population Size = total number captured x number marked (line #3 above)
/total number captured with mark
123 fish
3. Now, actually count the number of fish in your bowl: fish
106 fish
4. Find your percentage error by using the following formula: %
100 x (Your estimate of population - Actual size of population) / (Actual size of population)
16.0377%
5. What concerns should a biologist have about a species’ habits before (s)he uses this method to approximate
the size of a population?
Some concerns would be the hunting of the species and their migration.
Conclusion: How did you fulfill the purpose? What did you learn?
We fulfilled the purpose using the mark-recapture technique. Using a marker, we marked the fishes. We would then redistribute by mixing the water after dropping them back in. Each scoop represents the recapturing of the fish. Through this lab, I have learned that populations change over time. The population fluctuates throughout the changes the fish go through.