  Universal scaling in the power-law size distribution of pelagic fish schools
is established. The power-law exponent of size distributions is extracted
through the data collapse. The distribution depends on the school size only
through the ratio of the size to the expected size of the schools an arbitrary
individual engages in. This expected size is linear in the ratio of the spatial
population density of fish to the breakup rate of school. By means of extensive
numerical simulations, it is verified that the law is completely independent of
the dimension of the space in which the fish move. Besides the scaling analysis
on school size distributions, the integrity of schools over extended periods of
time is discussed.
