Search results
Results from the WOW.Com Content Network
Highly migratory species – a term which has its origins in the United Nations Convention on the Law of the Sea. It refers to fish species which undertake ocean migrations and also have wide geographic distributions. It usually denotes tuna and tuna-like species, shark, marlins and swordfish. See also transboundary stocks and straddling stocks.
Many species of salmon are anadromous and can migrate long distances up rivers to spawn Allowing fish and other migratory animals to travel the rivers can help maintain healthy fish populations. Fish migration is mass relocation by fish from one area or body of water to another. Many types of fish migrate on a regular basis, on time scales ...
Fish stocks are subpopulations of a particular species of fish, for which intrinsic parameters (growth, recruitment, mortality and fishing mortality) are traditionally regarded as the significant factors determining the stock's population dynamics, while extrinsic factors (immigration and emigration) are traditionally ignored.
Some species such as Pacific salmon migrate to reproduce; every year, they swim upstream to mate and then return to the ocean. [8] Temperature is a driving factor of migration that is dependent on the time of year. Many species, especially birds, migrate to warmer locations during the winter to escape poor environmental conditions. [9]
Wildebeest migrating in the Serengeti. Migration, in ecology, is the large-scale movement of members of a species to a different environment.Migration is a natural behavior and component of the life cycle of many species of mobile organisms, not limited to animals, though animal migration is the best known type.
Maritime sociology is a sub-discipline of sociology studying the relationship of human societies and cultures to the oceans and the marine environment as well as related social processes. [1] Subjects studied by maritime sociology are human activities at and with the sea such as seafaring , fisheries , maritime and coastal tourism, off-shore ...
Ethnoichthyology is a multidisciplinary field of study that examines human knowledge of fish, the uses of fish, and importance of fish in different human societies.It draws on knowledge from many different areas including anthropology, ichthyology, economics, oceanography, and marine botany.
Other cosmopolitan species, such as the house sparrow and osprey, present similar examples, but in yet other species there are less familiar complications: some migratory birds such as the Arctic tern occur from the Arctic to the Southern Ocean, but at any one season of the year they are likely to be largely in passage or concentrated at only ...