Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A Fisheries Catch-22: Conserving biodiversity or plundering genetic diversity?

11.12.2008
What is captive breeding doing to fish populations?

Human impacts on the environment have reduced populations of wild species to dangerously low levels.

Nowhere is this more apparent than in worldwide fisheries, where thanks to overfishing and habitat destruction, countless species and populations of fish are on the brink of disappearing forever. To attempt to mitigate the dire situation, captive breeding, the controlled breeding of organisms in protected environments, is regularly initiated.

Despite its popularity, does captive breeding actually work? In the current issue of Evolutionary Applications (1:4), Dr. Dylan Fraser of Dalhousie University provides a candid look at whether these breeding programs are fulfilling their mandates.

Using salmonids (the economically crucial group of fish that include salmon and trout) to illustrate his point, Fraser questions whether captive breeding is doing more harm than good. In his comprehensive review of over 300 papers, Fraser concludes that fish reared in captivity can rapidly lose the genetic diversity needed to adapt and survive in the wild, and that the rate of loss of diversity can both vary across breeding programs and be species specific. To complicate matters further, Fraser points out that that we simply do not know how captive-bred fish will perform once released back into the wild.

Unfortunately, without captive breeding to bolster their numbers, we may soon have too few individuals from which to repopulate disappearing fish populations, leaving us essentially in a fisheries catch-22.

Fraser concludes that not only do more data on the effects of captive breeding on the genetic diversity of fishes need to be collected, but also that alternatives to captive breeding, such as the live freezing of fish sperm of diverse genetic backgrounds, or the physical relocation of fish populations from one site to another, need more serious consideration.

Finbar Galligan | alfa
Further information:
http://www3.interscience.wiley.com/journal/120126564/abstract

More articles from Ecology, The Environment and Conservation:

nachricht Upcycling 'fast fashion' to reduce waste and pollution
03.04.2017 | American Chemical Society

nachricht Litter is present throughout the world’s oceans: 1,220 species affected
27.03.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>