Results 241 to 250 of about 387,580 (274)

The impact of technological progress on fishing effort

, 2001
Banks, R., Cunningham, S., Davidse, W.P., Lindebo, E., Reed, A., Sourisseau, E., de Wilde, J.W.   +6 more
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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
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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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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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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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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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Integrated fish farming: An international effort

American Journal of Alternative Agriculture, 1986
AbstractIn much of the developing world, the high cost of purchased feeds makes meat and milk too expensive to be consumed by the producers' own families. A fish pond integrated with livestock or crop production provides an important source of animal protein for home consumption or sale.
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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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Enjoying Catch and Fishing Effort: The Effort Effect in Recreational Fisheries

Environmental and Resource Economics, 2013
Recreational fishermen derive utility from catch and fishing effort. Building our analysis on the Gordon-Clark model for renewable resources, we show that a lower importance of catch may result in higher catches. While this effect also holds under first-best management, it may destabilize open-access recreational fisheries to the point of stock ...
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Assessing electric fishing sampling effort to estimate stream fish assemblage attributes

Fisheries Management and Ecology, 2012
AbstractTheEU WaterFrameworkDirective (WFD) obligates authorities to assess the ecological status of rivers. The sampling of the fish assemblage must be based on a reliable and cost‐effective monitoring programme, and it should be optimised to measure the ecological quality cost‐effectively.
Vehanen, T., Sutela, T., Jounela, P., Huusko, A., Mäki-Petäys, A.   +4 more
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