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en.wikipedia.org/wiki/Mark_and_recapture

Mark and recapture is a method commonly used in ecology to estimate an animal population's size. A portion of the population is captured, marked, and released. Later, another portion is captured and the number of marked individuals within the sample is counted.

The mark and recapture method involves marking a number of individuals in a natural population, returning them to that population, and subsequently recapturing some of them as a basis for estimating the size of the population at the time of marking and release. This procedure was first used by C.J.G.

www.cee.org/tep-lab-bench/pdf/PopulationSize.Worksheet.pdf

68 Exercise 3.B. Estimating Population Size: Mark-Recapture The assumption behind mark-recapture methods is that the proportion of marked individuals recaptured in the second sample represents the proportion of marked individuals in the population as a whole. In algebraic terms, This method is called the Lincoln-Peterson Index of population size.

oak.snr.missouri.edu/nr3110/topics/schnabel.php

Mark and Recapture Methods Schnabel Method: (Multiple marking) The Schnabel method is an extension of the Petersen method to a series of samples. Each sampling event includes capture, examination for previous marks, marking and then release.

www.maine.gov/.../high/documents/markrecapture.pdf

A variety of methods must be employed when attempting to estimate populations of insect or other pests. One method, used by entomologists and wildlife biologists, is the capture, mark and recapture method. The capture, mark, and recapture method is an alternative sampling method that is particularly useful with mobile or far-ranging species.

www.biologycorner.com/worksheets/estimating_population...

Objective: You will be expected to estimate the size of a sample population using the mark-recapture technique and compare the mark and recapture technique to other methods of population estimating. 1. You are given the responsibility of determining the number of fish in Horseshoe Lake. Discuss with ...