Auto Amazon Links: No products found. Blocked by captcha.
Freshwater fish species that embark on extensive migrations through rivers, lakes, and ponds are facing significant threats that jeopardize their ability to reach vital breeding sites. Obstacles such as dams, pollution, and overfishing have severely disrupted these migratory routes, contributing to sharp declines in fish populations. Highlighting this alarming trend, the United Nations has recently prioritized thirty key fish species for global conservation efforts in a new report.
This assessment was conducted by an international group of scientists who examined over 15,000 species of migratory freshwater fish—representing about half of all fish species worldwide. Their findings indicate an estimated population decrease of 81% over the past 50 years. The study emphasizes that despite their importance to human livelihoods, migratory freshwater fish have historically been overlooked by conservation strategies. This group includes iconic species such as the golden mahseer and the goonch catfish, with the latter often referred to as the giant devil catfish, struggling due to habitat development along rivers like the Indravati.
The conservation report underscores the value migratory fish hold not only as a food source for approximately 200 million people worldwide but also as a diverse group with remarkable biological traits. Dr. Zeb Hogan, a co-author of the report and professor of biology at the University of Nevada, Reno, pointed out the extraordinary diversity and scale of these fish. “You have fish that can get over 650 lb (295kg) that can migrate over 7,000 miles,” he said, referencing examples such as the golden dorado of South America and tropical eels in Oceania. The UN’s latest review builds on earlier work from 2011, expanding its scope to include many more species thanks to additional data collected by the International Union for the Conservation of Nature (IUCN).
The thirty priority species identified for urgent protection are culturally and ecologically significant and face critical threats from overfishing and habitat degradation. Michele Thieme from the World Wildlife Fund US highlighted, “The golden mahseer is [an] iconic fish of the Himalayas. It’s called the tiger of the river, and many of the people in that region value that fish for cultural and spiritual practices that go far beyond the economic values.” One of the major factors contributing to habitat loss is river fragmentation caused by dams and barriers that alter natural water flow essential for fish migration. In Europe, migratory paths are frequently hindered by structures such as small culverts or weirs, which cumulatively exhaust fish and increase their vulnerability to diseases and predation, according to Dr. Janina Gray of the environment charity WildFish.
Addressing these challenges requires international collaboration, as most migratory fish cross multiple national borders during their journeys. The UN’s Convention on the Conservation of Migratory Species (CMS), a treaty established in 1979, aims to foster cooperation among countries to protect migratory animals. At its upcoming meeting, the UN plans to propose including the 30 highlighted fish species in this agreement to enhance their conservation. Amy Fraenkel, the CMS Executive Secretary, noted that “the focus has clearly been on some of the more well known, more visible species,” but now migratory freshwater fish deserve the same coordinated protection. One success story under the convention is the Saiga antelope, which recovered from near extinction due to international anti-poaching measures—demonstrating the potential for effective global action on migratory species conservation
Read the full article from The BBC here: Read More
Auto Amazon Links: No products found. Blocked by captcha.