نتایج جستجو برای: fish harvesting

تعداد نتایج: 131730  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Matthew G Burgess Alexa Fredston-Hermann Malin L Pinsky Steven D Gaines David Tilman

Our report (1) examines factors that maintain the profitability of harvesting a population as it declines. Without management, this can incentivize harvesting to extinction (2). Le Pape et al. (3) note that humans have not yet caused many marine extinctions, and argue that harvesting fish populations to complete extinction should be difficult because of the high fecundity of these populations. ...

2012
Santiago Salinas Kestrel O Perez Tara A Duffy Stephen J Sabatino Lyndie A Hice Stephan B Munch David O Conover

The application of evolutionary principles to the management of fisheries has gained considerable attention recently. Harvesting of fish may apply directional or disruptive selection to key life-history traits, and evidence for fishery-induced evolution is growing. The traits that are directly selected upon are often correlated (genetically or phenotypically) with a suite of interrelated physio...

Journal: :دامپزشکی 0
مریم عضدی دانش آموخته کارشناسی ارشد، دانشگاه صنعتی اصفهان، مرکز مطالعات و پژوهش های خلیج فارس بوشهر عیسی ابراهیمی استادیار دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان ابراهیم متقی دانش آموخته کارشناسی ارشد، دانشگاه صنعتی اصفهان وحید مرشدی مرکز مطالعات و پژوهش های خلیج فارس بوشهر، عضو باشگاه پژوهشگران جوان دانشگاه آزاد واحد ایلام

in aquaculture, fishes might experience periods of food deprivation during pre-harvesting, transporting and sorting. in during starvation, some fish utilize muscle protein as a major energy source and some fish utilize primarily lipids. with respect to vital role of starvation periods on body composition, the current study was carried out for one month in autumn 2010 at research farm of isfahan...

2010
Tobias van Kooten Jens Andersson Pär Byström Lennart Persson André M. de Roos

We hypothesize that size at hatching strongly affects population dynamics of cannibalistic fish species and is a crucial determinant of how populations respond to selective removal of large individuals (harvesting). We use a mechanistic mathematical model to study the relation between hatching size and response to harvesting mortality, using Eurasian perch (Perca fluviatilis) as a model organis...

2009
Kenichi W Okamoto Rebecca Whitlock Pierre Magnan Ulf Dieckmann

Size-selective mortality caused by fishing can impose strong selection on harvested fish populations, causing evolution in important life-history traits. Understanding and predicting harvest-induced evolutionary change can help maintain sustainable fisheries. We investigate the evolutionary sustainability of alternative management regimes for lacustrine brook charr (Salvelinus fontinalis) fishe...

Journal: :International Journal for Research in Applied Science and Engineering Technology 2018

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده منابع طبیعی و علوم دریایی 1384

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