Navigation Links
Kenya's fisheries management promotes species that grow larger and live longer
Date:2/10/2011

Marine conservationists from the Wildlife Conservation Society working in Kenya have found that better fisheries management that includes restricting fishing gear is producing more predatory and longer-lived species and is improving fishing even in adjacent areas where no management is taking place.

During a 10-year study, conservationists recording fish catches found that the implementation of fishing regulationsand particularly the banning of small-mesh seine nets that indiscriminately capture all fishallowed practically all fish species to recover, especially those species that took longer to reproduce. Fish communities in regulated sites also had a greater diversity of predatory fish species and those with longer life spans. Even in unregulated areas there were small improvements to the fish community.

The study appears in the February print version of Fisheries Management and Ecology. The authors of the study include Dr. Tim McClanahan of the Wildlife Conservation Society and Christina Hicks of James Cook University in Australia.

The study examined the effects of increasing fisheries management and fishing gear restrictions in 11 coral reef sites along the 75-kilometer stretch of Kenyan coast around the city of Mombasa for a 10-year period.

The wholesale removal of fine-mesh seine nets was implemented in six sites to the south of Mombasa, all of which were more than 30 kilometers away from areas closed to fishing. Kenyatta Beacha landing site and popular tourist destination near Mombasa Marine National Parkserved as the study's most intensively regulated site. The northernmost sites, where fishermen continued to use seine nets in spite of restrictions, were within five kilometers of the fisheries closure zones. In addition to seine nets, other types of gear examined in the study were traps, lines, regular nets, and spears.

"The study shows that regulating coastal fisheries allows fish populations to recover in a number of predictable ways that correspond with knowledge of the biology and ecological characteristics of individual species, but also that the recovery was faster then predicted for some species," said Dr. Tim McClanahan, WCS Senior Conservationist and head of the society's coral reef research and conservation program.

From February 1998 to August 2007, researchers identified and measured individual fish from 152 species caught at each of the 11 siteswith 15 species representing approximately 90 percent of the data poolas well as recording the gear used. On average, all fish species from regulated sites over the course of the study increased in body length over time, with two speciesthe rabbitfish (averaging a short lifespan of 5.9 years) and seagrass parrotfish (averaging a intermediate lifespan of 7.7 years)exhibiting the most significant size increases following fishing regulations. The unregulated northern sites were dominated by short-lived herbivorous species and the very few species that were able to escape the gaps of small-meshed nets.

Predictably, the largest and longest lived fish were landed at the most regulated site (Kenyatta), and the smallest in the least regulated. Further, spears and gill nets caught the largest fish in the study, whereas the smallest were caught in seines and lines. Also, fish body lengths in the sites where seine net bans were implemented and enforced during the study were growing to the same lengths as fish from the most regulated site by the end of the study.

Dr. McClanahan said the improvements even in the unregulated areas suggest that strong management can improve conditions in adjacent areas where management is weak.

"This can lead to either free loading on the nearby stronger management or increased interests in participating in the improved management, depending on the interests, incentives, and organization of the fishing and management community," McClanahan said.

The study builds on a previous WCS study from the same sites on the costs and revenues of local fisheries along the coast of Kenya, which was published last year in Conservation Biology and demonstrated that effective fisheries management actually yields more profits for fishermen. In terms of income, fishermen working in Kenyatta experienced a 60 percent increase in revenue (from 224 up to 374 Kenya shillings, or $3 up to $5) following the beach seine ban in 2001. By contrast, daily income in the northern sites averaged $2 per person between 2002-2007. Overall, fishing revenue in the southern landing sites (all of which banned beach seines during the study period) was 41 percent higher than northern coast sites with the beach seines; Kenyatta's fishing revenue climbed to 135 percent higher than northern sites after seine elimination.

Dr. Caleb McClennen, Director of the Wildlife Conservation Society's Marine Program, said: "This important comparison of various fisheries management systems over time demonstrates the critical need to move past unregulated open-access fishing in resource poor countries around the world. This empirical evidence demonstrates how both fishers and their supporting ecosystems can and do benefit from restrictions and improved management,"


'/>"/>

Contact: John Delaney
jdelaney@wcs.org
718-220-3275
Wildlife Conservation Society
Source:Eurekalert  

Related biology news :

1. Arctic fisheries catches 75 times higher than previous reports: UBC research
2. Study finds fisheries management makes coral reefs grow faster
3. Co-management holds promise of sustainable fisheries worldwide
4. Globally sustainable fisheries possible with co-management
5. Study shows drifting fish larvae allow marine reserves to rebuild fisheries
6. Scientists question fisheries health test
7. Scientists question indicator of fisheries health, evidence for fishing down food webs
8. Widely adopted indicator of fisheries health questioned
9. New fisheries system will save about $20 million, Iowa State University researchers find
10. New collaborative process can help improve management of marine recreational fisheries
11. Global fisheries research finds promise and peril
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Kenya's fisheries management promotes species that grow larger and live longer
(Date:4/19/2016)... 2016 The new GEZE SecuLogic ... web-based "all-in-one" system solution for all door components. It ... the door interface with integration authorization management system, and ... The minimal dimensions of the access control and the ... installations offer considerable freedom of design with regard to ...
(Date:4/15/2016)... DUBLIN , April 15, 2016 ... of the,  "Global Gait Biometrics Market 2016-2020,"  report ... http://photos.prnewswire.com/prnh/20160330/349511LOGO ) , ,The global gait ... CAGR of 13.98% during the period 2016-2020. ... movement angles, which can be used to compute ...
(Date:4/13/2016)...  IMPOWER physicians supporting Medicaid patients in ... standard in telehealth thanks to a new partnership with ... IMPOWER patients can routinely track key health measurements, such ... and, when they opt in, share them with IMPOWER ... local retail location at no cost. By leveraging this ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June 23, 2016 A person commits ... the crime scene to track the criminal down. ... U.S. Food and Drug Administration (FDA) uses DNA evidence to ... Sound far-fetched? It,s not. The FDA has ... to support investigations of foodborne illnesses. Put as simply as ...
(Date:6/23/2016)... ... June 23, 2016 , ... Charm Sciences, Inc. is pleased ... received AOAC Research Institute approval 061601. , “This is another AOAC-RI approval of ... Salter, Vice President of Regulatory and Industrial Affairs. “The Peel Plate methods perform ...
(Date:6/23/2016)... , June, 23, 2016  The Biodesign Challenge ... envision new ways to harness living systems and biotechnology, ... Art (MoMA) in New York City ... 130 participating students, showcased projects at MoMA,s Celeste Bartos ... Paola Antonelli , MoMA,s senior curator of architecture and ...
(Date:6/23/2016)... ... 2016 , ... Supplyframe, the Industry Network for electronics hardware ... . Located in Pasadena, Calif., the Design Lab’s mission is to bring together ... built and brought to market. , The Design Lab is Supplyframe’s physical representation ...
Breaking Biology Technology: