63 citations
4 papers
Exploitation dynamics of fish stocks
Hiro-Sato Niwa
I address the question of the fluctuations in fishery landings. Using the fishery statistics time-series collected by the Food and Agriculture Organization of the United Nations si…
Power-law scaling in dimension-to-biomass relationship of fish schools
Hiro-Sato Niwa
Motivated by the finding that there is some biological universality in the relationship between school geometry and school biomass of various pelagic fishes in various conditions,…
Space-irrelevant scaling law for fish school sizes
Hiro-Sato Niwa
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. Th…
Power-law versus exponential distributions of animal group sizes
Hiro-Sato Niwa
There has been some confusion concerning the animal group-size: an exponential distribution was deduced by maximizing the entropy; lognormal distributions were practically used; a…