American eels are one of the most important commercial species. The catch of fish, in numbers or in weight, taken by a defined unit of fishing effort.
American eels are one of the most important commercial species.
American eels are one of the most important commercial species. An increase in growth rate shown by fish when their populations fall below certain levels. The precise reasons for this compensation are not known, but less competition for food and space are, among others, important factors. The continental shelf was a concept in geology long before it acquired any legal identity. The legal definition of 'continental shelf' does not necessarily correspond with the geomorphical one.