Featured Research

from universities, journals, and other organizations

Double jeopardy: Tuna and billfish

Date:
July 25, 2011
Source:
University of Miami Rosenstiel School of Marine & Atmospheric Science
Summary:
Scientists present an alarming assessment of several economically important fish populations. The analysis of 61 commercially important species classified 7 species as threatened with extinction and 4 as "near threatened" for the IUCN Red List of Threatened Species.

Dr. David Die provided data and input on a new study in Science by global fisheries experts presenting an alarming assessment of several economically important fish populations. The analysis of 61 species of "scombrids," which include tunas, bonitos, mackerels and Spanish mackerels, and billfishes, which include swordfish and marlins. The result: seven species classified as threatened with extinction and four as "near threatened" for the IUCN Red List of Threatened Species.
Credit: UM/RSMAS

A new study by top global fisheries experts presents an alarming assessment of several economically important fish populations. The analysis of 61 species of "scombrids," which include tunas, bonitos, mackerels and Spanish mackerels, and billfishes, which include swordfish and marlins, classified seven as threatened with extinction and four as "near threatened" for the IUCN Red List of Threatened Species.

Related Articles


University of Miami Rosenstiel School of Marine & Atmospheric Science associate professor, and assistant director of NOAA's Cooperative Institute for Marine and Atmospheric Studies (CIMAS) David Die and colleagues scientifically evaluated the species population and conservation status under the IUCN Red List Categories and Criteria, which is the most widely accepted system for classifying extinction risk at the species level.

"The IUCN assessments provide us with a different view of the conservation status of marine resources, when compared to that provided by fishery management organizations," said Die, who has studied highly migratory tuna and billfish for more than 12 years.

Die conducts research on highly migratory tunas and billfish and regularly contributes to assessments of Atlantic billfish and Atlantic tropical tunas. He contributed information on abundance trends and biological parameters for the Atlantic species of large tunas and billfish to this recent IUCN review study.

Of the 61 known species, seven are classified in a "threatened" category, being at serious risk of extinction. Four species are listed as "near threatened" and nearly two-thirds have been placed in the "least concern" category.

According to the IUCN, there is growing concern that in spite of the healthy status of several epipelagic (those living near the surface) fish stocks some scombrid and billfish species are being heavily overfished, and there is a lack of resolve to protect against overexploitation driven by high prices.

Global fish populations are under pressure from overfishing, pollution, habitat degradation, and disease. The U.N. Food and Agriculture Organization (FAO) estimates that 25 percent of the world's commercially important marine fish stocks were overfished or depleted.

Scombrids and billfishes are found throughout the world's oceans, primarily in tropical and temperate coastal and marine regions, and vary greatly in size and lifespan. The largest billfish, the Blue Marlin, and largest scombrid species, the Atlantic Bluefin, can grow to more than four meters (31 feet) long. In contrast, the smallest scombrid species, the Indian Mackerel, only grows to a maximum of 31 centimeters (~ 1 foot).

The health of ocean fisheries is assessed in several different ways. The IUCN review seeks to identify species threatened by extinction where as fisheries management evaluations focus on a population's sustainability in the face of exploitation.

"Our study reaches similar conclusions to those from the FAO," said Die. "Approximately one quarter of the worldwide fish stocks and species of "scombrids" are in an undesirable state of sustainable exploitation or conservation."


Story Source:

The above story is based on materials provided by University of Miami Rosenstiel School of Marine & Atmospheric Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. B. B. Collette, K. E. Carpenter, B. A. Polidoro, M. J. Juan-Jorda, A. Boustany, D. J. Die, C. Elfes, W. Fox, J. Graves, L. R. Harrison, R. McManus, C. V. Minte-Vera, R. Nelson, V. Restrepo, J. Schratwieser, C.- L. Sun, A. Amorim, M. Brick Peres, C. Canales, G. Cardenas, S.- K. Chang, W.- C. Chiang, N. de Oliveira Leite, H. Harwell, R. Lessa, F. L. Fredou, H. A. Oxenford, R. Serra, K.- T. Shao, R. Sumaila, S.- P. Wang, R. Watson, E. Yanez. High Value and Long Life--Double Jeopardy for Tunas and Billfishes. Science, 2011; 333 (6040): 291 DOI: 10.1126/science.1208730

Cite This Page:

University of Miami Rosenstiel School of Marine & Atmospheric Science. "Double jeopardy: Tuna and billfish." ScienceDaily. ScienceDaily, 25 July 2011. <www.sciencedaily.com/releases/2011/07/110725091713.htm>.
University of Miami Rosenstiel School of Marine & Atmospheric Science. (2011, July 25). Double jeopardy: Tuna and billfish. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/2011/07/110725091713.htm
University of Miami Rosenstiel School of Marine & Atmospheric Science. "Double jeopardy: Tuna and billfish." ScienceDaily. www.sciencedaily.com/releases/2011/07/110725091713.htm (accessed December 22, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Monday, December 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Earthworms Provide Cancer-Fighting Bacteria

Earthworms Provide Cancer-Fighting Bacteria

Reuters - Innovations Video Online (Dec. 21, 2014) Polish scientists isolate bacteria from earthworm intestines which they say may be used in antibiotics and cancer treatments. Suzannah Butcher reports. Video provided by Reuters
Powered by NewsLook.com
Existing Chemical Compounds Could Revive Failing Antibiotics, Says Danish Scientist

Existing Chemical Compounds Could Revive Failing Antibiotics, Says Danish Scientist

Reuters - Innovations Video Online (Dec. 21, 2014) A team of scientists led by Danish chemist Jorn Christensen says they have isolated two chemical compounds within an existing antipsychotic medication that could be used to help a range of failing antibiotics work against killer bacterial infections, such as Tuberculosis. Jim Drury went to meet him. Video provided by Reuters
Powered by NewsLook.com
Researchers Test Colombian Village With High Alzheimer's Rates

Researchers Test Colombian Village With High Alzheimer's Rates

AFP (Dec. 19, 2014) In Yarumal, a village in N. Colombia, Alzheimer's has ravaged a disproportionately large number of families. A genetic "curse" that may pave the way for research on how to treat the disease that claims a new victim every four seconds. Duration: 02:42 Video provided by AFP
Powered by NewsLook.com
Monarch Butterflies Descend Upon Mexican Forest During Annual Migration

Monarch Butterflies Descend Upon Mexican Forest During Annual Migration

Reuters - Light News Video Online (Dec. 19, 2014) Millions of monarch butterflies begin to descend onto Mexico as part of their annual migration south. Rough Cut (no reporter narration) Video provided by Reuters
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.

Save/Print:
Share:

Breaking News:

More Coverage


Increased Protection Urgently Needed for Tunas, Experts Urge

July 7, 2011 For the first time, all species of scombrids (tunas, bonitos, mackerels and Spanish mackerels) and billfishes (swordfish and marlins) have been assessed for the IUCN Red List of Threatened Species. ... read more

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

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