The first modern-day marine fish has officially gone extinct. More may follow

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by Elizabeth Claire Alberts

  • The smooth handfish (Sympterichthys unipennis), an unusual species that could “walk” on its pectoral and pelvic fins, is the first marine bony fish to go extinct in modern times, likely due to habitat loss and destructive fishing practices.
  • There was only ever one specimen of the smooth handfish known to scientists, which became the holotype for the entire species.
  • The other 13 species of handfish are threatened with extinction due to habitat loss, pollution, destructive fishing practices, and other human-linked causes, and conservationists are stepping up efforts to protect them.
  • Only four species of handfish have been spotted in the past 20 years, which has raised serious concerns for the future survival of these species.

There is only one photo of the smooth handfish: an image of a withered, yellowing specimen with pectoral fins that extend like arms, and a triangular crest attached to the top of its head. Sometime between 1800 and 1804, French zoologist François Péron plucked this fish out of the ocean while voyaging through Australia, presumably in the shallow coastal waters of southeastern Tasmania.

Since then, no other smooth handfish (Sympterichthys unipennis) has ever been spotted, and the fish that Péron collected became the holotype for the entire species. In March 2020, the IUCN officially declared the species to be extinct.

The holotype of the smooth handfish. Image by Australian National Fish Collection, CSIRO.The loss of this species may seem insignificant, especially since it hasn’t been seen for about 200 years, but it’s a noteworthy event: the smooth handfish is actually the first marine, bony fish to go extinct in modern times. While it could be argued that the New Zealand grayling (Prototroctes oxyrhynchus) was actually the first oceanic fish to die out, the grayling was migratory and spawned in freshwater, so wasn’t an exclusively marine fish.

Jessica Meeuwig, a professor at the University of Western Australia and director of the university’s Centre for Marine Futures, told Mongabay that the smooth handfish likely disappeared due to habitat loss and destructive fishing practices like scallop trawling, and that the species’ extinction is “indicative of broader problems in how we continue to manage our oceans.”

“Some claim that the ocean is too vast for marine wildlife to go extinct,” Meeuwig said in an email. “But ocean industrialisation from fishing, mining, oil and gas exploration, shipping and infrastructure development is catching up with the scale of industrialisation on land and with it the risk of extinction for marine wildlife.”

A red handfish, photographed in January 2020. Image by Antonia Cooper.

There are 13 other handfish species still living in Australian waters. While they come in many different shapes and sizes, handfish are characterized by their ability to “walk” on the seafloor with their pectoral and pelvic fins. They don’t have swim bladders to help control their buoyancy, so walking is their preferred source of transport. Handfish also have flamboyant antenna-like illiciums growing out of the top of their head to help lure prey.

But these strange-looking, ambulatory fish are threatened with extinction due to habitat decline, pollution, destructive fishing practices, and predation by invasive species such as Northern Pacific seastars (Asterias amurensis). Four handfish species are considered endangered, including the cockatoo handfish (Pezichthys amplispinus), narrowbody handfish (Pezichthys compressus), pink handfish (Brachiopsilus dianthus), and the Moulton’s handfish (Sympterichthys moultoni). Three others are critically endangered: the spotted handfish (Brachionichthys hirsutus), red handfish (Thymichthys politus), and the Ziebell’s handfish (Brachiopsilus ziebelli). There’s insufficient data on the rest of the handfish species to accurately assess their conservation status.

The Ziebell’s handfish, a critically endangered species, hasn’t been spotted since 2007. Image by Andrew Green.

Only four of the 13 handfish species have been spotted in the past 20 years, according to Jemina Stuart-Smith, a research fellow at the Institute for Marine and Antarctic Studies and manager of the Handfish Conservation Project. She told Mongabay this raises grave concerns about the species’ survival. One lost species is the critically endangered Ziebell’s handfish that lives on rocky reefs in the Tasman Peninsula. It hasn’t been spotted since 2007, and the team at the Handfish Conservation Project are urging the public to report any possible sightings in the last five years.

“Survey effort around Tasmania as part of a larger marine monitoring programs has resulted in more than 7653 underwater surveys since the early 1990s in Red and Ziebell’s habitat,” Stuart-Smith said in an email. “None [no Ziebell’s handfish] have been observed at additional sites from these surveys.”

While the Ziebell’s handfish is missing, conservationists are currently using a number of techniques to try and protect the other critically endangered handfish, the red and the spotted. This includes habitat restoration and management, public awareness campaigns, and the consideration of starting a captive-breeding program, according to Stuart-Smith. Scientists are also trying to learn as much as they can about the species to inform these conservation efforts.

A spotted handfish. Image by Rick Stuart-Smith.

“I think people should be concerned about the extinction of any species, especially ones that humans are likely to have caused,” Stuart-Smith said. “We don’t know enough about handfish to know what their ecological role is [and if extinction] will impact the ecosystems that they are a part [of], or whether it [the underlying causes] will lead to other extinctions. The Smooth handfish became extinct before we had a chance to study them.”

“Whilst most have not heard of the handfish, it is emblematic of the need to effectively protect marine biodiversity,” Meeuwig said. “Whilst the smooth handfish is now permanently lost to us, placing 30% of the oceans in highly protected marine parks, secure from exploitation, as recommended by much of the scientific community … will help ensure other marine wildlife does not follow the fate of the smooth handfish, with the additional benefit of building ocean resilience in the face of climate change.”

Source: news mongabay

 

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