In a 2006 article about the decrease of the world’s fish population from The Washington Post, staff writer Juliet Eilperin explains that fish population is measured through various research methods. These include having researchers study regional populations of fish, analyze records of what types of fish have been caught, and examine ocean ecosystems in order to draw conclusions about how fish are globally growing or decreasing in numbers.
Another method that some biologists use is to stand in a counting tower and keep track of the fish by counting as the fish swim by, or by tagging fish with numbers, releasing them back into the water, catching a group of fish to see how many are tagged or untagged, and then determining the population by contrasting the tagged and untagged groups.
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