Aquatic resources

From a biological point of view, it may be difficult to decide if a given population of fish is a stock or not, for this reason we use the term "aquatic resources", to emphasize a rousource management perspective. From a biological point of view, a stock comprises all the individuals of fish in an area, which are part of the same reproductive process. A stock is self-contained, with no emigration or immigration of individuals from or to the stock. It occupies a well-defined spatial range and is independent of other stocks of the same species. Random dispersal and directed migrations due to seasonal or reproductive activity can occur. Some species form a single stock (e.g. southern bluefin tuna) while others are composed of several stocks (e.g. albacore tuna in the Pacific Ocean comprises separate Northern and Southern stocks). The operational definition we assume is that a stock is identified by one or more species and one or more water areas where they can be found. Again, we provide two versions, with different owl:imports statements.

Note! The ontologies published here are draft versions  and should not be used as official expressions of any of the classifications sytems modeled.