Navigation Links
Overfishing in inland waters reduces biodiversity and threatens health

Systematic overfishing of fresh waters occurs worldwide but is largely unrecognized because of weak reporting and because other pressures can obscure fishery declines, according to an article in the December 2005 issue of BioScience.

Although the status of inland waters and their fish species should be of broad concern, threats to freshwater fisheries and associated biodiversity have received scant attention from conservation groups and the media, according to author J. David Allan of the University of Michigan and his colleagues. Allan and colleagues refer to the relative lack of attention to fresh waters as a "dangerous" imbalance, since freshwater ecosystems are by some accounts more threatened than marine ecosystems.

Fishing is a crucial source of livelihoods in developing nations, and in 2000 constituted an estimated 15.3 percent of human consumption of animal protein. About 1 billion people rely on fish as their primary protein source. Landings from inland waters have increased more than fourfold since 1950, mainly in developing nations, though in developed countries, in contrast, catches have decreased. But catch statistics are difficult to interpret for inland species because they may exclude recreational and illegal fisheries, and because landings are dispersed. Moreover, overfishing may not immediately cause declines in the total catch––and its weight may even transiently increase. Overfishing leads to numerous changes in both the target species and other species. Larger individuals and species are often successively replaced in the catch by smaller ones. At the same time, some fish populations respond to fishing pressure with reductions in mean size at maturation.

Allan and colleagues identify two main types of overfishing. One leads to marked declines in catch per unit effort and size of individuals captured. The second type is characterized by sequential declines of species and depletion of individuals and species of large size, e
'"/>

Source:American Institute of Biological Sciences


Page: 1 2

Related biology news :

1. Overfishing may drive endangered seabird to rely upon lower quality food
2. Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply
3. Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems
4. Survey finds silver contamination in North Pacific waters
5. UNC computer, marine scientists collaborate to predict flow of toxic waters from Katrina
6. Katrina floodwaters not as toxic to humans as previously thought, study says
7. Jellyfish dominate fish in over-harvested Namibian waters
8. Detecting microalgae in coastal waters
9. How fish species suffer as a result of warmer waters
10. Male circumcision reduces risk of HIV transmission from women to men
11. Deficiency of growth hormone and IGF-1 reduces cancer and kidney disease, but creates other problems
Post Your Comments:
(Date:7/28/2014)... the U.S. Food and Drug Administration (FDA) for other ... pathogens inside human cells, including those that cause Legionnaires, ... in mBio , the online open-access journal of ... of identifying non-antibiotic drugs that could one day help ... on the list inhibit the growth of at least ...
(Date:7/28/2014)... States have a circulatory problem of the legs called ... even require surgery in serious cases. This disease can ... limb amputation. , At The University of Texas Health ... a non-surgical preventative treatment in a mouse model of ... circulation. Their proof-of-concept study appears in the journal ...
(Date:7/28/2014)... rat brain cells suggests that the effects of a ... cells are temporary. , The study, published in this ... was conducted by biologists at the University of California, ... York in response to concerns, arising from multiple studies ... to general anesthetics may increase their susceptibility to long-term ...
Breaking Biology News(10 mins):New route to identify drugs that can fight bacterial infections 2Scientists discover genetic switch that can prevent peripheral vascular disease in mice 2Study suggests disruptive effects of anesthesia on brain cell connections are temporary 2Study suggests disruptive effects of anesthesia on brain cell connections are temporary 3
... genomics initiative ever undertaken an international effort to ... Earth will be officially activated this week. , ... launched by the Minister of Research and Innovation, Glen ... Saturday, September 25 at 6:30 p.m. , By enabling ...
... Contrary to a thousand face cream adverts, the secret of ... Dr. Carlos Herrera, a Professor of Research at the Consejo ... the withering action of flowers may have evolved to protect ... issue of the Annals of Botany ( http://dx.doi.org/10.1093/aob/mcq160 ...
... objects in a new computer program designed to give people ... thought the ease of the using the program,s automatic mode ... many participants in a pilot study didn,t like it because ... mode, which requires them to think several steps ahead and ...
Cached Biology News:Building a digital library for life on Earth 2Robotic arm's big flaw: Patients say it's 'too easy' 2
(Date:7/29/2014)... July 29, 2014 Human Longevity, Inc. (HLI), ... focused on extending the healthy, high performance human life ... , Ph.D., an expert in machine learning and machine ... to HLI from Google where he was Distinguished Research ... report directly to HLI Co-Founder and CEO, J. ...
(Date:7/29/2014)... , July 29, 2014  Pomerantz LLP is ... Inc. ("Impax" or the "Company") (NASDAQ: IPXL).  Such investors ... at rswilloughby@pomlaw.com or 888-476-6529, ext. 237. ... its officers and/or directors have violated Sections 10(b) and ... On July 29, 2014, Impax Laboratories, Inc. ...
(Date:7/29/2014)... PORTLAND, Oregon , July 29, 2014 ... titled, "Global surgical equipment market (types, applications and geography) ... Analysis, Research, Report, Opportunities, Segmentation and Forecast, 2013 - ... expected to reach $12.1 billion by 2020 registering a ... Due to the breakthrough achieved by the electro surgical ...
(Date:7/29/2014)... Philadelphia’s newest entrepreneurial incubation space is ready for business, and ... Center @3401 , a collaborative effort of Drexel University ... help attract and nurture start-up businesses in the region, officially ... , The Innovation Center @3401 (ic@3401), which is located at ... home of DreamIt Ventures and Point.io ...
Breaking Biology Technology:Franz Och, Ph.D., Expert in Machine Learning and Machine Translation, Joins Human Longevity, Inc. as Chief Data Scientist 2Franz Och, Ph.D., Expert in Machine Learning and Machine Translation, Joins Human Longevity, Inc. as Chief Data Scientist 3SHAREHOLDER ALERT: Pomerantz Law Firm Investigates Claims On Behalf of Investors of Impax Laboratories, Inc. - IPXL 2Global Surgical Equipment Market is expected to reach $12.1 billion by 2020 - Allied Market Research 2Global Surgical Equipment Market is expected to reach $12.1 billion by 2020 - Allied Market Research 3Innovation Center @3401 Opens for Business; DreamIt Ventures and Point.io First Residents 2Innovation Center @3401 Opens for Business; DreamIt Ventures and Point.io First Residents 3
... Research Foundation has licensed the California immunological research ... WARF's stem cell patents, Chemicon's parent company Serologicals ... to WARF's portfolio of stem cell technologies, which were ... . , ,Jeff Linton, president of Chemicon, said ...
... Platypus Technologies of suburban Madison has received ... for $200,000 from the National Cancer Institute. The grant ... rapid quantification of protein activity, useful for cancer research. ... II SBIR grant for $2.14 million from the National ...
... Customer Potential Management , a developer of databases and ... management solution has been implemented at the Michigan hospital ... the CRM solution to promote its collaboration with the ... with oncologists from both hospitals. While market research said ...
Cached Biology Technology:WARF signs stem cell agreement with California firm 2
... This CLS number is a ... easily match Cornings product number. ... please order under the old ... customer service for assistance. ...
... Maximize the value of your microarray data ... support you need from consultation to extensive ... date methods. Utilize our expertise in combination ... from your own microarray experiments., ,Normalization and ...
BD Falcon 850 cm Smooth-surface TufRol Roller Bottle, tissue-culture treated polystyrene, blow-molded one-piece design, with easy on/off non-vented cap. (2/sp, 20/ca) Packaging: 2 / pack, 20 /...
... of Flight Mass Analyzer for superior sensitivity, mass accuracy, and resolving ... m/z, * Precursor ion selection range: 150 - 4000 m/z, * ... with internal reference, * Dynamic range: 4 orders of magnitude ... ...
Biology Products: