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sustainable fishery

Anitha R Arathi, P Graham Oliver, Raveendhiran Ravinesh, Appukuttannair Biju Kumar
The economically valuable bivalve mollusc, known as the short-neck clam, is the major fishery resource of the brackishwater Ashtamudi Lake in Kerala, India. This fishery carries a Marine Stewardship Council certification for sustainability wherein it and all hitherto published reports identify the short-neck clam or yellow-foot clam as Paphiamalabarica (Dillwyn, 1817). It is noted that this name does not conform with current nomenclature and is now correctly referred to Protapesgallus (Gmelin, 1791). Furthermore, it is shown that the identification is also incorrect...
2018: ZooKeys
David Grémillet, Aurore Ponchon, Michelle Paleczny, Maria-Lourdes D Palomares, Vasiliki Karpouzi, Daniel Pauly
Fisheries transform marine ecosystems and compete with predators [1], but temporal trends in seabird-fishery competition had never been assessed on a worldwide scale. Using catch reconstructions [2] for all fisheries targeting taxa that are also seabird prey, we demonstrated that average annual fishery catch increased from 59 to 65 million metric tons between 1970-1989 and 1990-2010. For the same periods, we estimated that global annual seabird food consumption decreased from 70 to 57 million metric tons. Despite this decrease, we found sustained global seabird-fishery food competition between 1970-1989 and 1990-2010...
November 26, 2018: Current Biology: CB
Taynara P Franco, Cristiano Q Albuquerque, Rosa S Santos, Tatiana D Saint'Pierre, Francisco G Araújo
Movements of coastal fish species between estuarine systems (rearing grounds) and adjacent platforms (spawning grounds) are complex and can be influenced by multiple biotic and abiotic factors associated with the life cycle of each species. Understanding fish movement patterns between these habitats is crucial for sustainable management of these resources. We aimed to identify movement patterns of the whitemouth croaker Micropogonias furnieri, an important fishery resource along the southeastern Brazilian coast, through characterization of elemental concentration profiles in otoliths...
November 27, 2018: Marine Environmental Research
Sarah J Dolman, Philippa Brakes
The incidental capture of cetaceans and other protected marine wildlife in fishing gear has significant welfare implications. Many thousands of cetaceans are bycaught in fishing gear in European waters and hundreds of thousands die globally. We can expect many more to survive, but suffer from such interactions. As marine policy focuses on "population level" impact assessments and "sustainability" of fishing to preserve fish populations, the impacts to the bycaught individual, and their wider social group, are often largely underestimated, despite the large numbers affected...
2018: Frontiers in Veterinary Science
Carsten Niemitz
As the number of human individuals increases on a planet of invariable size and measures, the ecological conditions vary to a corresponding extent. Quite a number of biotic and abiotic factors are a matter of daily news as well as of current scientific discussions. In this contribution, eleven ecological fields concerning human life are analysed: • area available with respect to various competing utilisations, • fresh water needed as drinking water, for industrial processes and for irrigation as well as for other human purposes, • food production, nutrition and related aspects, • required fossil and regenerative energies, • atmosphere and climate, • marine ecology and fisheries, • human waste and ecological aftereffects, • the ecological functions of forests for human life, • biodiversity, • the Ecological Footprint, and • the development of human population increase...
November 30, 2018: Anthropologischer Anzeiger; Bericht über die Biologisch-anthropologische Literatur
Katharina Renner-Martin, Norbert Brunner, Manfred Kühleitner, Werner-Georg Nowak, Klaus Scheicher
The Bertalanffy-Pütter growth model describes mass m at age t by means of the differential equation d m /d t = p * m a  -  q * mb . The special case using the von Bertalanffy exponent-pair a = 2/3 and b = 1 is most common (it corresponds to the von Bertalanffy growth function VBGF for length in fishery literature). Fitting VBGF to size-at-age data requires the optimization of three model parameters (the constants p , q , and an initial value for the differential equation). For the general Bertalanffy-Pütter model, two more model parameters are optimized (the pair a < b of non-negative exponents)...
2018: PeerJ
Mark Moritz, Roy Behnke, Christine M Beitl, Rebecca Bliege Bird, Rafael Morais Chiaravalloti, Julia K Clark, Stefani A Crabtree, Sean S Downey, Ian M Hamilton, Sui Chian Phang, Paul Scholte, James A Wilson
Current theoretical models of the commons assert that common-pool resources can only be managed sustainably with clearly defined boundaries around both communities and the resources that they use. In these theoretical models, open access inevitably leads to a tragedy of the commons. However, in many open-access systems, use of common-pool resources seems to be sustainable over the long term (i.e., current resource use does not threaten use of common-pool resources for future generations). Here, we outline the conditions that support sustainable resource use in open property regimes...
November 28, 2018: Proceedings of the National Academy of Sciences of the United States of America
T R McClanahan, C A Abunge
Common-pool governance principles are becoming increasingly important tools for natural resource management with communities and co-management arrangements. Principle's effectiveness will depend on variability in agreements, trust, and adherence to institutional norms. We evaluated heterogeneity in governance principles by asking 449 people in 30 fishing communities in four East African countries to rate their effectiveness. The influences of individuals, membership, leadership, community, and country were tested...
November 28, 2018: Conservation Biology: the Journal of the Society for Conservation Biology
Nesar Ahmed, Shirley Thompson, Marion Glaser
To meet the demand for food from a growing global population, aquaculture production is under great pressure to increase as capture fisheries have stagnated. However, aquaculture has raised a range of environmental concerns, and further increases in aquaculture production will face widespread environmental challenges. The effects of climate change will pose a further threat to global aquaculture production. Aquaculture is often at risk from a combination of climatic variables, including cyclone, drought, flood, global warming, ocean acidification, rainfall variation, salinity, and sea level rise...
November 20, 2018: Environmental Management
Tim Cashion, Santiago de la Puente, Dyhia Belhabib, Daniel Pauly, Dirk Zeller, U Rashid Sumaila
A third of global fish stocks are overexploited and many are economically underperforming, resulting in potential unrealized net economic benefits of USD 51 to 83 billion annually. However, this aggregate view, while useful for global policy discussion, may obscure the view for those actors who engage at a regional level. Therefore, we develop a method to associate large companies with their fishing operations and evaluate the biological sustainability of these operations. We link current fish biomass levels and landings to the revenue streams of the companies under study to compute potentially unrealized fisheries revenues and profits at the level of individual firms...
2018: PloS One
Katherine McFarland, Matthew P Hare
Restoring and conserving coastal resilience faces increasing challenges under current climate change predictions. Oyster restoration, in particular, faces threats from alterations in precipitation, warming water temperatures, and urbanization of coastlines that dramatically change salinity patterns, foster the proliferation and spread disease, and disrupt habitat connectivity, respectively. New York City (NYC) coastal waters, once home to a booming oyster fishery for eastern oysters (Crassostrea virginica), are now nearly devoid of live oyster reefs...
2018: PloS One
Qun Lin, Jun Wang, Zhong Yi Li, Xiu Juan Shan, Ming Zuo, Yan Fen Liu
Yellow River Estuary and adjacent waters are famous shellfish production areas. Mactra veseriformis, Ruditapes philippinarum, and Meretix meretrix are important species for stocking enhancement. At present, the annual output of shellfish bottom sowing culture has reached 300 thousand tons, with an output value of 1.54 billion RMB. Over stocking of shellfish will cause environmental changes in marine, increase shellfish mortality and endanger ecosystem health. Accordingly, the assessment of the carrying capacity for shellfish based on ecosystem underpins responsible marine fisheries enhancement...
September 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
David Tickler, Jessica J Meeuwig, Katharine Bryant, Fiona David, John A H Forrest, Elise Gordon, Jacqueline Joudo Larsen, Beverly Oh, Daniel Pauly, Ussif R Sumaila, Dirk Zeller
Marine fisheries are in crisis, requiring twice the fishing effort of the 1950s to catch the same quantity of fish, and with many fleets operating beyond economic or ecological sustainability. A possible consequence of diminishing returns in this race to fish is serious labour abuses, including modern slavery, which exploit vulnerable workers to reduce costs. Here, we use the Global Slavery Index (GSI), a national-level indicator, as a proxy for modern slavery and labour abuses in fisheries. GSI estimates and fisheries governance are correlated at the national level among the major fishing countries...
November 7, 2018: Nature Communications
John A Mohan, Nathan R Miller, Sharon Z Herzka, Oscar Sosa-Nishizaki, Suzanne Kohin, Heidi Dewar, Michael Kinney, Owyn Snodgrass, R J David Wells
As upper-level predators, sharks are important for maintaining marine food web structure, but populations are threatened by fishery exploitation. Sustainable management of shark populations requires improved understanding of migration patterns and population demographics, which has traditionally been sought through physical and/or electronic tagging studies. The application of natural tags such as elemental variations in mineralized band pairs of elasmobranch vertebrae cartilage could also reveal endogenous and exogenous processes experienced by sharks throughout their life histories...
November 7, 2018: Proceedings. Biological Sciences
Irfan Yulianto, Hollie Booth, Prayekti Ningtias, Tasrif Kartawijaya, Juan Santos, Sarmintohadi, Sonja Kleinertz, Stuart J Campbell, Harry W Palm, Cornelius Hammer
Overfishing is a major threat to the survival of shark species, primarily driven by international trade in high-value fins, as well as meat, liver oil, skin and cartilage. The Convention on the International Trade in Endangered Species of Wild Fauna and Flora (CITES) aims to ensure that commercial trade does not threaten wild species, and several shark species have recently been listed on CITES as part of international efforts to ensure that trade does not threaten their survival. However, as international trade regulations alone will be insufficient to reduce overexploitation of sharks, they must be accompanied by practical fisheries management measures to reduce fishing mortality...
2018: PloS One
Daniel Ayllón, Steven F Railsback, Ana Almodóvar, Graciela G Nicola, Simone Vincenzi, Benigno Elvira, Volker Grimm
Harvesting alters demography and life histories of exploited populations, and there is mounting evidence that rapid phenotypic changes at the individual level can occur when harvest is intensive. Therefore, recreational fishing is expected to induce both ecological and rapid evolutionary changes in fish populations and consequently requires rigorous management. However, little is known about the coupled demographic and evolutionary consequences of alternative harvest regulations in managed freshwater fisheries...
October 2018: Ecology and Evolution
M Lago, B Boteler, J Rouillard, K Abhold, S C Jähnig, A Iglesias-Campos, G Delacámara, G J Piet, T Hein, A J A Nogueira, A I Lillebø, P Strosser, L A Robinson, A De Wever, T O'Higgins, M Schlüter, L Török, P Reichert, C van Ham, F Villa, McDonald Hugh
The AQUACROSS project was an unprecedented effort to unify policy concepts, knowledge, and management of freshwater, coastal, and marine ecosystems to support the cost-effective achievement of the targets set by the EU Biodiversity Strategy to 2020. AQUACROSS aimed to support EU efforts to enhance the resilience and stop the loss of biodiversity of aquatic ecosystems as well as to ensure the ongoing and future provision of aquatic ecosystem services. The project focused on advancing the knowledge base and application of Ecosystem-Based Management...
October 9, 2018: Science of the Total Environment
Eze Simpson Osuagwu, Eseoghene Olaifa
The Niger Delta region is the oil producing area of Nigeria, which consists of highly diverse ecosystems that are supportive of numerous species of terrestrial and aquatic fauna and flora. Crude oil spills endanger fish hatcheries in coastal water and also contaminate valuable fish. This study examines the effects of oil spills on fish production in the Niger Delta of Nigeria from 1981-2015 using an estimable Cobb Douglas production function. The findings suggest that oil production and spills negatively affect fish production, while farm labour has a positive effect on fish production...
2018: PloS One
Halvor Knutsen, Per Erik Jorde, Jeffrey A Hutchings, Jakob Hemmer-Hansen, Peter Grønkjær, Kris-Emil Mose Jørgensen, Carl André, Marte Sodeland, Jon Albretsen, Esben M Olsen
Coexistence in the same habitat of closely related yet genetically different populations is a phenomenon that challenges our understanding of local population structure and adaptation. Identifying the underlying mechanisms for such coexistence can yield new insight into adaptive evolution, diversification and the potential for organisms to adapt and persist in response to a changing environment. Recent studies have documented cryptic, sympatric populations of Atlantic cod ( Gadus morhua ) in coastal areas. We analysed genetic origin of 6,483 individual cod sampled annually over 14 years from 125 locations along the Norwegian Skagerrak coast and document stable coexistence of two genetically divergent Atlantic cod ecotypes throughout the study area and study period...
October 2018: Evolutionary Applications
Mostafa A R Hossain, Isha Das, Lily Genevier, Sugata Hazra, Munsur Rahman, Manuel Barange, Jose A Fernandes
Hilsa (Tenualosa ilisha) or river shad is an anadromous fish species widely distributed in the North Indian Ocean, mainly in the Bay of Bengal (BoB). Hilsa is the national fish of Bangladesh and it contributes 10% of the total fish production of the country, with a market value of $1.74 billion. Hilsa also holds a very important place in the economics of West Bengal of India with 12.5% of the catch and also tops the marine capture in Myanmar. During the last two decades Hilsa production from inland waters has been stable, whereas marine yields in the BoB increased substantially...
February 15, 2019: Science of the Total Environment
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