نتایج جستجو برای: fish harvesting

تعداد نتایج: 131730  

2009
Christian Jørgensen Bruno Ernande Øyvind Fiksen

Exploitation of living resources can lead to evolutionary changes in harvested populations of plants (Law and Salick 2005) and mammals (Coltman et al. 2003), but because of the grand scale of commercial fishing most examples come from fish. The reviews by e.g. Jørgensen et al. (2007), Kuparinen and Merilä (2007), Fenberg and Roy (2008), Hutchings and Fraser (2008), and Sharpe and Hendry (2009) ...

Journal: :iran agricultural research 2007
m. loghavi sh. mohseni

the aim of this study was to determine the most suitable shaking frequency and amplitude for shake harvesting lime fruit (c. aurantifolia). a tractor mounted limb shaker with adjustable shaking frequency and amplitude, powered by the tractor power-take-off shaft was designed and developed for this study. the rotating input power was transmitted to the shaker flywheel through a multiple sheave v...

Journal: :Biophysical journal 2001
V Barzda V Gulbinas R Kananavicius V Cervinskas H van Amerongen R van Grondelle L Valkunas

Singlet-singlet annihilation experiments have been performed on trimeric and aggregated light-harvesting complex II (LHCII) using picosecond spectroscopy to study spatial equilibration times in LHCII preparations, complementing the large amount of data on spectral equilibration available in literature. The annihilation kinetics for trimers can well be described by a statistical approach, and an...

Journal: :Chemical communications 2014
Markus Probst Simon M Langenegger Robert Häner

A light-harvesting complex composed of a π-stacked multichromophoric array in a DNA three-way junction is described. The modular design allows for a ready exchange of non-covalently attached energy acceptors.

2016
Huidong Li Chuan Tian Jun Lu Mitchell J. Myjak Jayson J. Martinez Richard S. Brown Zhiqun Daniel Deng

Acoustic telemetry is the primary method to actively track aquatic animals for behavioral studies. However, the small storage capacities of the batteries used in the transmitters limit the time that the implanted animals can be studied. In this research, we developed and implemented a battery-free acoustic transmitter that uses a flexible piezoelectric beam to harvest energy from fish swimming ...

2012
Charles R. E. Hazlerigg Kai Lorenzen Pernille Thorbek James R. Wheeler Charles R. Tyler

Population regulation is fundamental to the long-term persistence of populations and their responses to harvesting, habitat modification, and exposure to toxic chemicals. In fish and other organisms with complex life histories, regulation may involve density dependence in different life-stages and vital rates. We studied density dependence in body growth and mortality through the life-cycle of ...

2009
Brian N. Tissot William J. Walsh

A network of nine Fish Replenishment Areas (FRA) reserves was demarcated in West Hawai’i in 2000 in response to declines of reef fishes taken by aquarium collectors. In 1999, we established 23 study sites in FRAs, areas open to collectors and reference areas (existing protected areas) to collect data both prior to and after the closure of the reserve network in 2000. To date we have conducted 3...

2015
Alexander D. M. Wilson Jacob W. Brownscombe Brittany Sullivan Sofia Jain-Schlaepfer Steven J. Cooke Christopher Somers

Recently, there has been growing recognition that fish harvesting practices can have important impacts on the phenotypic distributions and diversity of natural populations through a phenomenon known as fisheries-induced evolution. Here we experimentally show that two common recreational angling techniques (active crank baits versus passive soft plastics) differentially target wild largemouth ba...

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