Aparna Lucknow, India 601 Questions 0 Answers 0 Best Answers 678 Points View Profile Aparna Asked: October 21, 20212021-10-21T00:09:31+05:30 2021-10-21T00:09:31+05:30In: GENERAL What is A GIANT FISH IS DECLARED EXTINCT? A GIANT FISH IS DECLARED EXTINCT. current affairsenvironment Share Facebook 1 Answer Recent 0 Questions 518 Answers 176 Best Answers 0 Points View Profile Best Answer [Deleted User] 2021-10-21T00:13:34+05:30Added an answer on October 21, 2021 at 12:13 am Context: One of the largest freshwater fish has been declared extinct in a study published in the journal Science of the Total Environment. About The Chinese paddlefish (Psephurusgladius) was an iconic species, measuring up to 7 m in length, dating back from 200 million years ago, and therefore swimming the rivers when dinosaurs ruled the Eart Its ancestral home was the Yangtze River. Chinese researchers made this conclusion based on the Red List criteria of the International Union for Conservation of Nature (IUCN). The Red List has several categories for extinction “Extinct in the wild” means a species survives only in a captive environment “Locally extinct” means a species has ceased to exist in a particular area but may exist in other areas. “Functionally extinct”, which means the species continues to exist but it has too few members to enable to reproduce meaningfully enough to ensure survival. “Globally extinct”, means a species has no surviving member anywhere. Such a conclusion is reached when there is no reasonable doubt left that its last member has died. Other facts Declaring a species extinct is an elaborate process. It involves a series of exhaustive surveys, which need to be taken at appropriate times, throughout the species’ historic range, and over a time frame that is appropriate to the species’ life cycle and form. Once declared extinct, a species is not eligible for protective measures and conservation funding; therefore, the declaration has significant consequences. In the case of the Chinese paddlefish, the researchers made the conclusion over long-term surveys. It was once common in the Yangtze, before overfishing and habitat fragmentation — including dam-building — caused its population to dwindle from the 1970s onwards. Between 1981 and 2003, there were just around 210 sightings of the fish. The researchers estimate that it became functionally extinct by 1993, and extinct sometime between 2005-2010. 1 Reply Share Share Share on Facebook Share on Twitter Share on WhatsApp Leave an answerCancel replyYou must login or register to add a new answer. Related Questions What is Pathalgadi? What is Bodo Accord?
One of the largest freshwater fish has been declared extinct in a study published in the journal Science of the Total Environment.