{"id":311498,"date":"2026-03-03T20:55:10","date_gmt":"2026-03-03T20:55:10","guid":{"rendered":"https:\/\/www.newsbeep.com\/nz\/311498\/"},"modified":"2026-03-03T20:55:10","modified_gmt":"2026-03-03T20:55:10","slug":"like-an-aircraft-hovering-in-the-middle-of-the-water-ghostly-cavefish-found-beneath-the-ground-in-china","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/nz\/311498\/","title":{"rendered":"“Like an \u2018aircraft\u2019 hovering in the middle of the water.” Ghostly cavefish found beneath the ground in China"},"content":{"rendered":"

309 new species of freshwater fish from around the world were described in 2025, making it a \u201cbumper year\u201d for freshwater discoveries.\u00a0<\/p>\n

Among the new finds\u00a0on the\u00a0annual\u00a0New Species report<\/a>, a collaboration between freshwater conservation charity Shoal, the California Academy of Sciences and global taxonomists and institutions,\u00a0is the sicklefin redhorse (Moxostoma ugidatli), which lives in the Tennessee River basin, stretching across North Carolina and Georgia in the United States. The researchers described the fish as \u201cperhaps the largest truly new North American species discovered in the past half century.\u201d Its name\u00a0ugidatli\u00a0derives from the Cherokee language, meaning \u2018wearing a feather\u2019, a nod to the fish\u2019s most distinctive feature: a tall, sickle-shaped dorsal fin.\u00a0<\/p>\n

Scientists also described the black arrow tetra (npaichthys luizae), which is notable for its gold with black oblique stripes. Found in the Rio Tapaj\u00f3s basin of Brazil, the fish is considered so beautiful that individuals were being sold for more than $100 (\u00a375) each, before its description qualified it for conservation protection.\u00a0<\/p>\n

Others new additions range from cave-dwelling fishes in China \u2013 including the Yang’s plateau loach \u2013 to minnows in Anatolian streams, as well as the ancestor cory (Hoplisoma noxium), found in the Amazon basin in Par\u00e1 state, Brazil, which is known to produce powerful toxins when stressed that can kill other fish when kept in close proximity after capture.<\/p>\n

\"Yang'sYang’s plateau loach (Triplophysa yangi) was found in a subterranean river in China’s Yunnan Province. \u201cWhen I first saw Triplophysa yangi, I was deeply attracted by its unique appearance,” said researcher Wansheng Jiang. “It doesn\u2019t move much, likely to conserve energy, appearing like an \u2018aircraft\u2019 hovering in the middle of the water.” Credit: Wansheng Jiang<\/p>\n

\u201c309\u00a0new freshwater fish species in a single year is the third highest amount described since records began in 1758,\u201d\u00a0says Mike Baltzer, executive director of Shoal<\/a>. \u201cThe average this century has been around 250, so 2025 was a bumper year. <\/p>\n

“Partly, it reflects improved scientific capacity. Taxonomists are working with better tools and there is growing local expertise in biodiversity hotspots. Previously remote habitats are becoming more accessible, although the same forces that allow us to discover new species can be the forces that threaten them.\u00a0<\/p>\n

“What this figure ultimately tells us is that freshwater biodiversity is far richer than we\u2019ve documented. There\u2019s an extraordinary amount of life yet to be described. But until species are formally recognised and named, they\u2019re effectively \u2018invisible\u2019 to conservation. Discovery is the first step towards protection.\u201d<\/p>\n

\"AncestorAncestor cory (Hoplisoma noxium) from the Amazon basin, Par\u00e1 State, Brazil. Credit: Hans Evers<\/p>\n

Freshwater ecosystems<\/a> cover less than 1% of the Earth\u2019s surface. The New Species 2025 report showcases species from\u00a0rivers, lakes and wetlands\u00a0that have only just been recognised by science. Each one represents years of fieldwork, taxonomic expertise and international collaboration. Many are likely to be found nowhere else on Earth.<\/p>\n

Four African annual killifishes in the\u00a0Nothobranchius\u00a0genus are also described: the rainbow killi, marbled killi, Katemo Manda\u2019s killi and the Dubie Killi. \u201cLike all annual killifish, they have one of the most remarkable life cycles in the vertebrate world,\u201d\u00a0Baltzer explains.\u00a0\u201cThey live in temporary pools that form during the rainy season, sometimes no larger than a puddle. The adults hatch, grow, mature and reproduce in a matter of weeks. Before the pools evaporate, they lay eggs. When the dry season comes, the adults die and the habitat turns to dust. But the eggs remain, lying dormant in bone-dry earth for months, sometimes longer, waiting for rain. When the rains return, the next generation hatches and the cycle begins again. It\u2019s a life lived against the clock \u2013\u00a0an evolutionary response to extreme seasonality. These fishes are small, often jewel-bright, and astonishingly resilient. They remind us that even the tiniest, most ephemeral habitats can harbour extraordinary evolutionary stories.\u201d<\/p>\n

\"RainbowThe rainbow killi (Nothobranchius iridescens) gets its name from the species’ bright, multi-coloured appearance. Credit: B\u00e9la Nagy<\/p>\n

Freshwater fishes are among the most threatened vertebrates on the planet. According to the IUCN, around one in three assessed freshwater fish species are threatened with extinction. Habitat loss, dams, pollution, invasive species and climate change are driving declines that often go unnoticed compared with terrestrial wildlife crises, despite the fact that freshwater ecosystems support food security, drinking water, cultural heritage and the livelihoods for billions of people.<\/p>\n

Of all the world\u2019s freshwater fish species described last year, only one has so far been assessed for the IUCN\u2019s Red List of Threatened Species:\u00a0Nothobranchius sylvaticus, a forest killifish from Tanzania, which researchers listed as Critically Endangered. <\/p>\n

Other species profiled are already thought to be highly threatened, and would likely be listed as Critically Endangered on assessment. Newly found species can wait years for formal conservation assessment. But without Red List assessments, conservationists lack the data needed to prioritise action, secure funding and protect habitats.<\/p>\n

\"MarbledMarbled killi (Nothobranchius marmoreus). Credit: B\u00e9la Nagy<\/p>\n

By spotlighting newly described freshwater fishes, Shoal hopes to raise awareness and increase support for conservation.\u00a0\u201cOn one hand, there is real cause for celebration,\u201d says\u00a0Baltzer. \u201cThe fact that we\u2019re still describing hundreds of freshwater fish species each year speaks to the extraordinary richness of life in freshwater, and to the dedication of researchers around the world who are uncovering it. There is something profoundly hopeful in knowing that our planet still holds so many biological secrets. <\/p>\n

“But there is also a sobering reality. Many of the newly described species are rare, range-restricted, and already under pressure. Some inhabit single river systems or isolated wetlands that are being altered faster than we can document them. We are almost certainly losing species before we even know they exist.<\/p>\n

“Every species described represents not just a fish, but an entire ecological story, a web of interactions, evolutionary history, and habitat specificity. Discovery must go hand in hand with protection.\u201d\u00a0<\/p>\n

New Species 2025<\/a> is available to download.<\/p>\n

More wildlife stories from around the world<\/p>\n","protected":false},"excerpt":{"rendered":"309 new species of freshwater fish from around the world were described in 2025, making it a \u201cbumper…\n","protected":false},"author":2,"featured_media":311499,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[111,139,69,147,406],"class_list":["post-311498","post","type-post","status-publish","format-standard","has-post-thumbnail","category-wildlife","tag-new-zealand","tag-newzealand","tag-nz","tag-science","tag-wildlife"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/311498","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=311498"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/311498\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/311499"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=311498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=311498"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=311498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}