來源： Robins, undated
到達日期： late 1960's
The initial introduction of Clarias batrachus is believed to be linked either to the importation of adult brood stock by an aquaculture facility in Palm Beach County or to a truck transporting brood fishes between Miami and the town of Parkland, Broward County, Florida. The spread of the walking catfish from this area has been remarkable. Finding the many hundreds of miles of interconnected canals in south Florida to be a veritable highway for dispersal, this species spread to 20 counties in 10 years, no doubt aided by its ability to traverse short distances over land and potentially enhanced survivorship imparted by parental care of their young. Their abundance in some small Florida ponds was estimated in excess of 3,000 pounds per acre. Its establishment includes specific locations: Florida Panther National Wildlife Refuge, Charlotte Harbor, Mayakki River, Pelican Island National Wildlife Refuge, Big Cypress National Preserve, Everglades National Park (Robins, undated; Nico, 2006) and many others which can be viewed here.
The walking catfish has been established in Everglades National Park and in Big Cypress National Preserve since the mid-1970s (Courtenay 1989). Populations suffer periodic die-offs due to cold temperatures; consequently, northward dispersal is limited.
競爭: Clarias batrachus will outcompete or directly consume several co-occurring native species in Florida. Resident centrarchids, freshwater sunfish, and native catfish species appear particularly susceptible to impacts from this invader. C. batrachus can also negatively impact native amphibian populations by preying on tadpoles (Masterson, 2007).
經濟 /民生: Clarias batrachus in South Florida are known to invade commercial aquaculture facilities, often consuming vast numbers of the stocks of fishes (Robins, undated).
最後修改 ： 21/03/2005 12:46:56 p.m.