Abstract
The method of integral geometry is developed to estimate fish density. We can estimate two dimensional measure using measurement of one dimensional quantity. In this papar, we apply this method called line intercept method. The conditions using this method are as follows: searching individuals by observer, numrous readily visible individuals, large individuals and interception of object by line. In this research, it was recognized that the use of an echo sounder as a searching observer is good for the line intercept method. There are some problems in estimating biomass, but the method is a good way to estimate number of fish schools. We think this method may be used widely in the future, though it has not yet been put sufficiently into practical use in the field of fisheries.
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