Results 201 to 210 of about 16,343 (251)

Population Dynamics and Body Size Structure of the Antarctic Krill <i>Euphausia superba</i> in the Bransfield Strait and South Shetland Islands. [PDF]

Biology (Basel)
Zhao G, Li S, Yang J, Zhang G, Xu B, Liu H, Rao X, Lian P, Huang H, Li L.   +9 more
europepmc   +1 more source

Importance and spatial patterns of invisible fisheries in Amazonian clear-water rivers as revealed by fisher knowledge and collaboration. [PDF]

Conserv Biol
Silvano RAM, Vieira KC, Pereyra PER, Tomazoni-Silva LH, Alves IA, Bezerra JG, Dutra MCF, Keppeler FW, Nunes CB, Cunha CV, Hallwass G.   +10 more
europepmc   +1 more source

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Water quality, fishing effort and fish yield in lakes

Fisheries Research, 1992
The relationship between fish yield, water quality and fishing effort was explored in 70 Finnish lakes. The total yield (kg ha−1 yr−1) was also split to species level (11 species). Fishing effort was estimated by the number of fishermen (fishermen km−2). The principal components of water quality variables were extracted.
Esa Ranta, Kai Lindström, Kalervo Salojärvi   +2 more
openaire   +1 more source

Fishing Mortality and Effort

1993
It is convenient to distinguish three problems which involve the variation of the fishing mortality coefficient with age. The first (§8.1.1), concerns the effects of the selective action of the meshes of the fishing gear, and of the interaction between this and recruitment to the exploited area.
Raymond J. H. Beverton, Sidney J. Holt
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Impact of wind speed on fishing effort

Modeling Earth Systems and Environment, 2020
In this work, we search to show the influence of the wind speed on the annual fishing effort, catches and profit of seiners, and show that these parameters are the most important parameters involved in seiner’s fishing activity. To achieve this objective, we consider a bioeconomic system of marine populations exploited, in the southern Atlantic zone of
Imane Agmour, Mermiem Bentounsi, Noussaiba Baba, Youssef El Foutayeni, Naceur Achtaich, Chaouki Aouiti   +5 more
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The Social Aspects of Fishing Effort

Human Ecology, 2007
While economic literature inspired by the “tragedy of the commons” has emphasised people’s tendency to increase fishing effort beyond desirable levels, sociologists and anthropologists who have studied the social aspects of fishing have often emphasised the capacity of these factors to restrict fishing effort.
Stig S Gezelius, Gezelius Stig S
exaly   +3 more sources

Optimal spatial distribution of the fishing effort in a multi fishing zone model

Ecological Modelling, 2006
This work presents a stock-effort dynamical model of a fishery subdivided on several fishing zones. The stock corresponds to a fish population moving between different zones, on which they are harvested by fishing fleets. The bio-economical model is a set of ODE’s governing the fishing efforts and the stocks on the different fishing zones.
Rachid Mchich, Pierre Auger, Nadia Raissi   +2 more
exaly   +3 more sources

Variable effort fishing models in random environments

Mathematical Biosciences, 1999
We study the growth of populations in a random environment subjected to variable effort fishing policies. The models used are stochastic differential equations and the environmental fluctuations may either affect an intrinsic growth parameter or be of the additive noise type.
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How commercial fishing effort is managed

Fish and Fisheries, 2018
AbstractWild capture fisheries produce 90 million tonnes of food each year and have the potential to provide sustainable livelihoods for nearly 40 million people around the world (http://www.fao.org/3/a-i5555e.pdf). After decades of overfishing since industrialization, many global fish stocks have recovered, a change brought about through effective ...
Christopher M. Anderson, Melissa J. Krigbaum, Martin C. Arostegui, Megan L. Feddern, John Zachary Koehn, Peter T. Kuriyama, Christina Morrisett, Caitlin I. Allen Akselrud, Melanie J. Davis, Courtney Fiamengo, Ava Fuller, Qi Lee, Katherine N. McElroy, Maite Pons, Jessica Sanders   +14 more
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Fishing area, effort, and yield

1981
The drainage system centering on the Rio Madeira can be divided into three main commercial fishing regions: 1) Beginning upriver, the first is the large area embracing the Rio Beni, Rio Mamore, and Rio Guapore. The Rio Beni lies entirely within Bolivia, while the Rio Mamore and Rio Guapore are shared with Brazil.
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