Spawning Articles
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Expanding marine protected areas to restore fisheries
After World War II, accelerating population growth and steadily rising incomes drove the demand for seafood upward at a record pace. At the same time, advances in fishing technologies, including huge refrigerated processing ships that enabled trawlers to exploit distant oceans, enabled fishers to respond to the growing world demand. In response, the oceanic fish catch climbed from 19 million tons ...
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Organic and conventional production systems in the wisconsin integrated cropping systems trials: i. Productivity 1990–2002
During the last half-century, agriculture in the upper U.S. Midwest has changed from limited-input, integrated grain–livestock systems to primarily high-input specialized livestock or grain systems. This trend has spawned a debate regarding which cropping systems are more sustainable and led to the question: can diverse, low-input cropping systems (organic systems) be as productive as ...
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Alternative futures for Southern Bluefin Tuna
This paper examines the outcomes of alternative management scenarios for the Southern Bluefin Tuna (SBT) fishery over the next 30 years. Two criteria are used to characterise outcomes: economic efficiency as measured by the present value of net benefits generated and conservation as measured by the predicted size of the spawning stock biomass in 20 years' time (SSB20). A bioeconomic model, ...
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CORNucopia of Opportunity in the Heartland: Or Just More Feed for the Political Cattle?
We now live in a carbon constrained world. Fears of human induced climate change are bringing about changes in government, corporate and consumer behaviors. Investments in renewable energy are increasing, corporations are greening everything from their supply chain to their vehicle fleet, and consumers are seeking to minimize their ecologic footprint as well. Are some of our greening efforts ...
By AHC Group
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Predation of Northern Pike (Esox lucius L.) Eggs: A Possible Cause of Regionally Poor Recruitment in the Baltic Sea
Northern pike (Esox lucius) spawning habitat and egg mortality were studied in three spawning areas in 2001 along the Swedish coast of the Baltic proper: the Blekinge Archipelago, Kalmar Sound and coastal freshwater streams. Spawning peaked during the last week of April in streams, at temperatures ranging from 7.7 to 8.9 °C and during the first week of May in brackish waters, at temperatures ...
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In Situ Avoidance Response Of Adult Atlantic Salmon To Waste From The Wood Pulp Industry
An accidental release of non-toxic waste from decommissioned wood pulp industry in the River Numedalslågen, Southern Norway, occurred in the upper part of the accessible stretches for anadromous fish during a study of migration behaviour of radio tagged Atlantic salmon (Salmo salar, n=32, body length 51–99 cm). The fish had completed the migration phase and initiated the resident phase ...
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Factors affecting seasonal mortality of rosy bitterling (Rhodeus ocellatus kurumeus) embryos on the gills of their host mussel
I investigated the seasonal change in factors affecting embryonic mortality in the rosy bitterling, Rhodeus ocellatus kurumeus, a freshwater fish that spawns on the gills of living unionid mussels. Research was conducted in a small pond during 1999 and 2001 in which bitterling were provided with Anodonta sp. mussels for spawning. Bitterling spawned between April and July, peaking mid–late May. ...
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General Electric, a model of corporate citizenship and business evolution
The General Electric Company has spawned from the creativity and genius of Thomas Edison, the entrepreneurial spirit and business savvy of Charles Coffin, and the capital support of J.P. Morgan. The culture of continual improvement and industrial research at General Electric has produced significant breakthroughs and contributions to science and society. The paper presents an analytic framework ...
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State Fish Hatcheries and Invasive Species Don’t Mix
INTRODUCTION The Vermont Fish and Wildlife Department is responsible for the protection and management of the state’s fish populations. Cultured fish are stocked in natural and manmade areas that are excellent for growth and survival but have little or no spawning habitat. Other stocking areas include natural water bodies where spawning and nursery habitats have been destroyed or isolated ...
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