Depletion of the body snatchers: bad news for marine environment
A recent study conducted for The IUCN Red List of Threatened Species™ has determined that 20% of hagfish species are at an elevated risk of extinction*. Scientists warn that this figure could be much higher.
Photo: Paddy Ryan / Ryan Photographic
The results of this research, carried out in association with Conservation International (CI), indicate that the primary causes of hagfish declines are the direct and indirect effects of fisheries.
Hagfish represent an ancient and unique evolutionary lineage; as bottom feeders they play an important role by cleaning the ocean floor and recycling nutrients into the food web which maintains the overall health of the ecosystems they inhabit.
“By consuming the dead and decaying carcasses that have fallen to the ocean floor, hagfish clean the floor creating a rich environment for other species including commercial fish such as cod, haddock and flounder,” says Landon Knapp, research assistant for the IUCN Marine Biodiversity Unit at Old Dominion University and lead author of the study. “The presence of hagfish in areas of intense fishing is extremely important as large amounts of bycatch are discarded."
Particular areas of concern highlighted in the study include southern Australia, where the only hagfish species present is threatened, and the coast of southern Brazil. Also of concern are the species found in the East China Sea, the Pacific coast of Japan, and coastal Taiwan; in these areas, four of the 13 hagfish species occurring are threatened with extinction.
“In many geographic regions, only one or two hagfish species are present, and therefore the loss or decline of even a single species in these areas will have detrimental effects on ecosystems as a whole, as well as the fisheries that depend on them,” says Dr Michael Mincarone, Professor of Zoology at Universidade Federal do Rio de Janeiro, an author of the study.
Fisheries worldwide directly profit from the harvesting of hagfish, such as Myxine garmani (Vulnerable) and Eptatretus burgeri (Near Threatened) for leather and food. Hagfish are also an important part of the food chain, being prey for fishes, seabirds and even marine mammals, including seals. When fishing pressure was focused on hagfish in certain locations in the north-western Atlantic, the stock of other commercial species, such as flounder, plummeted.
Overexploitation and destructive fishing practices are major threats to several hagfish species, including Myxine paucidens and Paramyxine taiwanae, both listed as Endangered. No current conservation measures or legislation exist to protect hagfish populations.
“Additional data is required and controls for the regulation and management of hagfish fisheries and other threats to hagfish populations are urgently needed to ensure the survival of these important species,” says Dr Kent Carpenter, Professor at Old Dominion University, manager of IUCN’s Marine Biodiversity Unit and an author of the paper.
“Hagfish are a great example of one of those ‘not-so-cute’ species that play a vital role in ecosystem health,” says Cristiane Elfes, Programme Officer for the CI-IUCN Biodiversity Assessment Unit. “This study highlights the impact we have on hagfish and the importance of protecting them to maintain the stability of ocean ecosystems.”
*For those groups that have been comprehensively assessed on the IUCN Red List, the percentage of threatened species can be calculated, but the actual number of threatened species is often uncertain because it is not known whether Data Deficient (DD) species are actually threatened or not. Therefore, the percentage presented above provides the best estimate of extinction risk for this group (excluding Extinct species), based on the assumption that Data Deficient (DD) species are equally threatened as data sufficient species. In other words, this is a mid-point figure within a range from x% threatened species (if all DD species are not threatened) to y% threatened species (if all DD species are threatened). Available evidence indicates that this is a best estimate.
For example, for hagfishes, 20% of species (excluding DD species) are threatened, although the precise figure is uncertain and could lie between 12% (if all DD species are not threatened) and 51% (if all DD species are threatened).
For more information, please contact:
Borjana Pervan, IUCN Media Relations, t +41 22 999 0115, m +41 79 857 4072, e email@example.com;
Kathryn Pintus, Communications, IUCN Species Programme, t +41 22 999 0154, e firstname.lastname@example.org;
Kevin Connor, Media Manager, Conservation International, t + 1 703 341 2405, e email@example.com
Spokespeople available for interviews:
Landon Knapp, Research Assistant, Old Dominion University, Lknap003@odu.edu
Heather Harwell, Post-Doctoral Research Associate, Global Marine Species Assessment, IUCN Global Species Programme, firstname.lastname@example.org
Cristiane Elfes, Programme Officer, CI-IUCN Biodiversity Assessment Unit, email@example.com
TOTAL HAGFISH SPECIES ASSESSED = 76
Extinct = 0
Extinct in the Wild = 0
Critically Endangered = 1
Endangered = 2
Vulnerable = 6
Near Threatened = 2
Data Deficient = 30
Least Concern = 35
The hagfish assessments
The hagfish assessments are a part of the Global Marine Species Assessment’s mission to complete more than 20,000 marine species assessments for inclusion on the IUCN Red List of Threatened Species. The Global Marine Species Assessment Unit (GMSA), or Marine Biodiversity Unit, is a joint initiative of IUCN and Conservation International. The GMSA is headquartered in the Department of Biology at Old Dominion University in Norfolk, Virginia, and is largely enabled by the generous support of the New Hampshire Charitable Foundation and Tom Haas.
Complete results of the hagfish species assessments are published on the IUCN Red List of Threatened Species (www.iucnredlist.org).
The IUCN Red List of Threatened Species™
The IUCN Red List of Threatened Species™ (or the IUCN Red List) is the world’s most comprehensive information source on the global conservation status of plant, fungi and animal species. It is based on an objective system for assessing the risk of extinction of a species should no conservation action be taken.
Species are assigned to one of eight categories of threat based on whether they meet criteria linked to population trend, population size and structure and geographic range. Species listed as Critically Endangered, Endangered or Vulnerable are collectively described as ‘Threatened’.
The IUCN Red List is not just a register of names and associated threat categories. It is a rich compendium of information on the threats to the species, their ecological requirements, where they live, and information on conservation actions that can be used to reduce or prevent extinctions.
The IUCN Red List is a joint effort between IUCN and its Species Survival Commission, working with its Red List partners BirdLife International; Botanic Gardens Conservation International; Conservation International; NatureServe; Royal Botanic Gardens, Kew; Sapienza University of Rome; Texas A&M University; Wildscreen; and Zoological Society of London.
The IUCN Red List threat categories
The IUCN Red List threat categories are as follows, in descending order of threat:
Extinct or Extinct in the Wild
Critically Endangered, Endangered and Vulnerable: species threatened with global extinction
Near Threatened: species close to the threatened thresholds or that would be threatened without ongoing specific conservation measures
Least Concern: species evaluated with a lower risk of extinction
Data Deficient: no assessment because of insufficient data
Critically Endangered (Possibly Extinct): this is not a new IUCN Red List Category, but is a flag developed to identify those Critically Endangered species that are in all probability already Extinct but for which confirmation is required, for example, through more extensive surveys being carried out and failing to find any individuals.