Featured Research

from universities, journals, and other organizations

Scientists Describe The World's Smallest, Lightest Fish

July 22, 2004
Scripps Institution Of Oceanography
Scientists in San Diego have described the earth's smallest, lightest animal with a backbone. The miniscule "stout infantfish" is a new species no longer than the width of a pencil.

Credit: Courtesy of Scripps Institution Of Oceanography / University of California, San Diego

Scientists in San Diego have described the earth's smallest, lightest animal with a backbone. H.J. Walker of Scripps Institution of Oceanography at the University of California, San Diego, and William Watson of the Southwest Fisheries Science Center, National Marine Fisheries Service, in La Jolla have identified the miniscule "stout infantfish," a new species no longer than the width of a pencil.

Related Articles

Found exclusively in the vicinity of Australia's Great Barrier Reef and the Coral Sea, only six specimens are known to exist.

The largest specimen-and only female-measures approximately a third of an inch (8.4 millimeters) while the males measure just over a quarter of an inch (7 millimeters). Roughly 500,000 of these fish weighed together would barely tip the scales at one pound. A full scientific description of the animal was published in the latest issue of Records of the Australian Museum.

The first stout infantfish was captured in 1979 by the Australian Museum's Jeff Leis during fieldwork in the Lizard Island / Carter Reef area of the Great Barrier Reef. After it was left unstudied for years, Watson and Walker recently analyzed the animal in detail for the first time. They spent roughly six months studying the creature but instantly recognized it as something special.

"It was a really good day when I first looked under the microscope and recognized something that I knew was a new species. I said to myself, 'Wow, this is really great,'" said Walker, a senior museum scientist in the Scripps Marine Vertebrates Collection. "But at the time I didn't realize that I was looking at the world's smallest vertebrate."

The stout infantfish supplants the dwarf goby as the new record holder of the world's smallest vertebrate (animal with a backbone). The scientists developed the animal's name (scientific name Schindleria brevipinguis) to characterize its thick, or "stout," structure as compared with other infantfishes. "Infant" describes the uncommon early-stage features of the animal. It is transparent without pigmentation, except for its eyes, and lacks teeth, scales and certain characteristics typical of other fishes.

Scientists note that the stout infantfish's unusual appearance corresponds with its extremely short lifespan, which is believed to be approximately two months. Many features characteristic of a larval stage of development appear even though it is fully mature.

"It's interesting that these animals experience several generations each year," said Watson, a fishery biologist. "This suggests that they could evolve quite quickly as well. They live in a specialized habitat that could be threatened by global warming or human development, but they may have the ability to evolve as fast as their environment changes."

Philip Hastings, the curator of the Scripps Marine Vertebrates Collection, says the identification of the stout infantfish is another demonstration that scientists do not yet possess a complete inventory of marine animals, even for relatively well-studied groups like fishes, and in fact many important species remain undiscovered.

"Anytime a scientist identifies an 'extreme' in the world it's important," said Hastings. "Think about the whole envelope of life. Most of us systematists describe things that fill in the dots in the middle of the envelope. This new discovery is pushing the edge, increasing the size of the envelope. It's important because it demonstrates that we're still expanding our knowledge of the limits of the diversity that's present on this planet and there are still significant new discoveries to be made. We need to continue doing what we can to explore and describe the diversity before it's gone, in addition to focusing our efforts on protecting biodiversity."

Other recent examples of discoveries of new fish species by Scripps scientists include the description of the "saddled prickleback," a species that lives on the sea bottom, discovered off San Diego's coastline, and the "orangeflag blenny," a species found on reefs off Belize. New discoveries continue to unfold near and far.

The recent findings also underscore the importance of scientific resources such as Scripps's invaluable Marine Vertebrates Collection. This collection of more than two million fish specimens is used by researchers at Scripps and around the world to uncover new information about the animal world.

"Collections such as these provide an enormous library of materials that allow us to make comparisons for new discoveries," said Hastings. "Unless you know what's already known, you don't know what's new."


A copy of the paper is available from the Australian Museum at: http://www.amonline.net.au/pdf/publications/1429_complete.pdf

Scripps Institution of Oceanography on the web: http://scripps.ucsd.edu

Scripps News on the web: http://scrippsnews.ucsd.edu

Scripps Collections: http://collections.ucsd.edu/donors.cfm

Southwest Fisheries Science Center: http://swfsc.nmfs.noaa.gov


Scripps Institution of Oceanography, at the University of California, San Diego, is one of the oldest, largest, and most important centers for global science research and graduate training in the world. The National Research Council has ranked Scripps first in faculty quality among oceanography programs nationwide. The scientific scope of the institution has grown since its founding in 1903 to include biological, physical, chemical, geological, geophysical, and atmospheric studies of the earth as a system. Hundreds of research programs covering a wide range of scientific areas are under way today in 65 countries. The institution has a staff of about 1,300, and annual expenditures of approximately $140 million from federal, state, and private sources. Scripps operates one of the largest U.S. academic fleets with four oceanographic research ships and one research platform for worldwide exploration.

Story Source:

The above story is based on materials provided by Scripps Institution Of Oceanography. Note: Materials may be edited for content and length.

Cite This Page:

Scripps Institution Of Oceanography. "Scientists Describe The World's Smallest, Lightest Fish." ScienceDaily. ScienceDaily, 22 July 2004. <www.sciencedaily.com/releases/2004/07/040722090720.htm>.
Scripps Institution Of Oceanography. (2004, July 22). Scientists Describe The World's Smallest, Lightest Fish. ScienceDaily. Retrieved December 19, 2014 from www.sciencedaily.com/releases/2004/07/040722090720.htm
Scripps Institution Of Oceanography. "Scientists Describe The World's Smallest, Lightest Fish." ScienceDaily. www.sciencedaily.com/releases/2004/07/040722090720.htm (accessed December 19, 2014).

Share This

More From ScienceDaily

More Plants & Animals News

Friday, December 19, 2014

Featured Research

from universities, journals, and other organizations

Featured Videos

from AP, Reuters, AFP, and other news services

Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) — The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Kids Die While Under Protective Services

Kids Die While Under Protective Services

AP (Dec. 18, 2014) — As part of a six-month investigation of child maltreatment deaths, the AP found that hundreds of deaths from horrific abuse and neglect could have been prevented. AP's Haven Daley reports. (Dec. 18) Video provided by AP
Powered by NewsLook.com
When You Lose Weight, This Is Where The Fat Goes

When You Lose Weight, This Is Where The Fat Goes

Newsy (Dec. 17, 2014) — Can fat disappear into thin air? New research finds that during weight loss, over 80 percent of a person's fat molecules escape through the lungs. Video provided by Newsy
Powered by NewsLook.com
The Hottest Food Trends for 2015

The Hottest Food Trends for 2015

Buzz60 (Dec. 17, 2014) — Urbanspoon predicts whicg food trends will dominate the culinary scene in 2015. Mara Montalbano (@maramontalbano) has the story. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.


Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News


Free Subscriptions

Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile

Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?

Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins