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Optimum Size of Sampling Unit for Estimating the Density of Marine Populations

Michael Pennington and Jon H. Volstad
Biometrics
Vol. 47, No. 2 (Jun., 1991), pp. 717-723
DOI: 10.2307/2532157
Stable URL: http://www.jstor.org/stable/2532157
Page Count: 7
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Optimum Size of Sampling Unit for Estimating the Density of Marine Populations
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Abstract

Data from several trawling experiments and from some scallop dredge surveys indicate that, within limits, a smaller sampling unit can be more efficient than a larger unit for marine abundance surveys. Taking into account survey costs and sampling variability, the unit size is found that produces the most precise density estimate given a fixed amount of survey resources or, if a certain level of precision is required, the size of sampling unit that minimizes the total cost of the survey. As an illustration, the optimum sampling unit sizes are derived for surveys of some fish populations and for a scallop stock on Georges Bank.

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