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Search for New Fish Species Yields to Weird and Beautiful Discoveries

Each year scientists are discovering scores of new fish species, like a new species of giant arapaima recently found in the rivers of Guyana. These discoveries are important in ways you might never have imagined. (Photo courtesy of Keith Sutton)

One might think new species of fish are rarely discovered; truth is many areas beneath the water's surface remain unexplored and researchers discover dozens of previously unknown annually

June 5, 2016. Richard Pyle, a marine biologist with Hawaii’s Bishop Museum, is scuba diving 300 feet beneath the ocean’s surface off Kure Atoll, the northernmost Hawaiian island, 1,200 miles northwest of Honolulu. He’s there on a National Oceanic and Atmospheric Administration research cruise, studying the area’s unique coral ecosystem and documenting species that occur there.

Pyle is well acquainted with the numerous fish swimming around Kure. But one he spies doesn’t resemble any he’s ever seen before. The beautiful pink-and-gold creature has a prominent red spot on its dorsal fin that tells Pyle it’s something unique. Intrigued, he collects the fish for closer examination in the research boat.

“It was one of those eureka moments,” Pyle said later. After he and his colleagues examined the fish, a member of a group called basslets, they were convinced. It was a species unknown to science.

Just two and a half months after Pyle’s discovery, President Barack Obama, at the urging of native Hawaiian leaders, conservationists and marine scientists, quadrupled the size of Papahanaumokuakea Marine National Monument, which encompasses Kure Atoll. At 582,578 square miles, it is now the largest swath of protected land or water on Earth, an area roughly twice the size of Texas.

It is not surprising then that Pyle and his colleagues decided to name the fish Tosanoides obama.

“We named this fish after President Obama to recognize his efforts to protect and preserve the natural environment, including the expansion of the Papahanaumokuakea,” said Pyle. “This expansion adds a layer of protection to one of the last great wilderness areas on Earth.”

One might think that new species of fish are rarely discovered. After all, men have been dragging nets and fishing lines through the Earth’s waters for hundreds of years, and have been exploring the depths with scuba gear and submersibles for decades.

In truth, however, many areas beneath the water’s surface remain unexplored, and researchers scrutinizing such waters are discovering dozens of previously unknown species every year. Many species are elusive and difficult to find, so scientists must extensively search lakes, streams, oceans and even caves and underground aquifers before coming across something new.

Advances in DNA analysis also aid in the search for new species. Blood and tissue samples from museum specimens or fishes that closely resemble one another can be tested to determine if they come from known species or are something new and different.

New fish discovered in recent years vary from the weird to the beautiful, from tiny to gargantuan in size and from deep-sea dwellers to jungle air-breathers.

Consider, for example, Lasiognathus regan, a previously unknown anglerfish found deep in the Gulf of Mexico. One writer described the 1- to 4-inch long creature as looking like “a hunchbacked, rotting old shoe with spikes, a scraggly mustache and a big mouth with bad teeth.” Growing from the fish’s head is a “fishing pole” with a bioluminescent lure. Bacteria cause the lure to glow in the perpetual darkness of the deep, attracting other fish the weird angler eats. This species inhabits depths exceeding 4,000 feet, where pressure is 100 times greater than we experience on land.

The hideous-looking anglerfish contrasts greatly with the colorful dwarf snakehead (Channa andrao) researchers found near West Bengal, India. This long, slender fish exudes beauty, with glowing electric-blue fins and body markings. But what makes it extra special are its abilities to breathe air and “walk” across land. Should the shallow waters it lives in dry up, it can wriggle up to a quarter mile over wet ground to another home site, surviving up to four days out of water.

Three more Asian beauties were discovered recently by researchers diving on Indonesia’s coral reefs. Called flasher wrasses, the males of these species (Paracheilinus alfiani, P. paineorum and P. xanthocirritus) are like living neon signs. As they dart about underwater, their muted colors rapidly change to eye-popping pinks, reds and blues to impress potential mates.

The coastal waters of western Australia were the site of another new discovery in 2015 – the ruby seadragon, an unusual fish related to seahorses. A few specimens dating as far back as 1919 had been preserved in museum collections, but it wasn’t until a sharp-eyed researcher noticed differences in this unusual fish and its two known living relatives that DNA tests were run, determining the ruby seadragon was an entirely new species. Using information about the original collection sites, biologists employed a remote-controlled submersible to find and film living rubies, which are so named because of their brilliant crimson coloration. They believe the fish’s red hues are absorbed at the great depths where seadragons live, helping to camouflage them from predators.

It’s easy to understand why an inches-long fish living deep in the ocean escapes notice for so long, but could a 10-foot, 400-pound air-breather also be among the new fish discoveries? It seems so. Scientists testing the DNA of giant arapaimas, fish that breathe air through a primitive lung, have found genetically distinct populations in Guyana’s rivers. These fish closely resemble one another, but analysis of their genetic coding reveals at least one new species – perhaps several – swimming in South America’s jungle waters.

Scientists say there are many species of fish yet to be discovered, but the knowledge base is expanding faster than ever before. The United Nations Educational, Scientific and Cultural Organization reports that 1,565 new fish species came to light between 1999 and 2008. And scores more have been added to the list since then. In saltwater alone, roughly 150 new species are described each year. Add in freshwater discoveries and the tally climbs into the hundreds.

Why is all this important? Are there legitimate reasons why so much time, effort and money is spent on finding fish we didn’t know about? As anglers, should we really care?

Meg Lowman, chief of science and sustainability at the California Academy of Sciences, summed up the answer nicely in an interview with San Francisco Chronicle reporter Kevin Schultz. “Every time we make a new species discovery, it may be a key to a future medicine, the glue that holds together an ecosystem or an important new predator,” she said “Half of the time we don’t know these things, but that’s the purpose: to be this incredible Noah’s Ark of biodiversity for the researchers of tomorrow.”

Such concepts are not just the wishful thinking of scientists trying to justify their work. Their practical application is seen in many facets of fish study ongoing in different disciplines.

For example, toadfish, a group of seemingly unimportant creatures found in oceans worldwide, are proving important in medical research. Male toadfish can contract their swim bladders extremely fast in order to create sounds that attract mates. Researchers believe that studying these muscles may help them fight cardiomyopathy, a condition where the heart cannot pump blood properly because of its inability to relax normally

Another unique toadfish adaptation that scientists find interesting is their ability to regenerate the central nervous system. When cut, the spinal cord of the toadfish will regenerate completely, unlike humans’. Scientists believe this could lead to advances in prosthetic devices for people with central nerve damage.

The pufferfish, well-known for its unique bloated shape and prickly self-defense mechanism, also has been shown to provide important medical benefits. These fish secrete a deadly neurotoxin in some of their internal organs and on their skin, often making the fish a fatal meal for predators. Researchers are developing new medications from that toxin that may help improve the lives of cancer patients suffering debilitating pain caused by chemotherapy treatments.

Could the discovery of new species of fish lead to more such breakthroughs? No one knows for sure, but it’s highly likely and one reason continued new species research is important.

Discovering new species also helps us sustainably manage fish populations that could be vulnerable to overharvest or other threats. Take the bonnethead, a small species of hammerhead shark found in the United States, Bahamas, Caribbean and Latin America. For decades, scientists believed there was just a single species of bonnethead that was abundant and widespread. Therefore, there were few regulations governing the harvest of this species, which is heavily targeted by commercial and recreational fishermen.

However, when scientists recently sequenced the DNA of what they believed to be bonnethead sharks in Belize, they were shocked to find that they are likely an entirely different species based on large genetic differences between them and other bonnetheads in the region. The discovery that there might actually be two species with smaller ranges and overall numbers means scientists must reassess each of their vulnerabilities.

“Now we have to define the range of each of these species individually and assess them independently against where the potential threats are,” said Florida International University marine scientist Demian Chapman, the lead researcher of the team making the discovery. “For example, there are published reports that bonnetheads have nearly been wiped out by unregulated fishing in Brazil. We do not know which species this is and our finding of a new species in Belize highlights that there could be more undescribed ones out there, each one facing a unique set of threats.”

Such discoveries are now more important than ever because species are dying off worldwide at alarming rates from habitat loss, pollution, climate change and other often man-made influences. The die-offs are happening faster than researchers can identify the species. Giving a species a name is the first step toward protecting it from extinction, as once it is identified, efforts to monitor and conserve the species can be put in place

To create a better world for humans and other animal inhabitants of our planet, we certainly need to know as much as possible about all of the world’s creatures, including fish. Once we can understand what makes them tick, we can grasp how we can help them and how they can help us.

Yet even if new species don’t always have immediate benefits that make our lives better, we should strive to know and understand every living creature with which we share our world. In some ways, many new discoveries are like great works of art. They don’t have much practical purpose at all. But sometimes it’s just enough for fish to amaze and impress us the same way those artworks do. Discovering new species, never before seen by any human eyes, certainly serves that purpose.

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