63 research outputs found

    Can Catfish Aquaculture be Profitable in Farm Ponds?

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    Extensive channel catfish farming is a means of utilizing farm ponds for aquaculture production for either supplementary income of home use. This involves stocking catfish at sufficiently low densities such that a pond is able to assimilate excess feed and fish wastes without needing supplemental aeration or chemicals to keep water quality from reaching toxic levels. This is "low-tech" aquaculture and requires little producer labor/management inputs. A mathematical model of extensive catfish culture in farm ponds was presented in this paper. This model used data from Kentucky where part-time producers, with a minimum of aquaculture experience and time for pond management, are involved in culturing catfish for retail/live markets. Results of this model showed that the optimal strategy would be to stock fish at densities up to 3,000/ha/yr (1,200/ac/yr). Other results showed that breakeven prices were less than 2.20/kg(2.20/kg (1.00/lb), a popular retail price for whole catfish. Hence, this paper concluded that small-scale aquaculture is both feasible and profitable in farm ponds, provided the producer had access to retail markets for the product.Mathematical programming, catfish, aquaculture, farm ponds, Livestock Production/Industries,


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    Water quality standards and a limited water supply have dramatically restricted the expansion of the U.S. trout industry. Faced with production restrictions, producers have turned to value-added products to strengthen the economic growth of the industry. In the near future, trout steaks could surface in retail outlets as a new revenue source for the mature trout industry. A telephone survey of consumers in Chicago and Los Angeles was conducted by the University of Idaho in the spring of 1997 to determine consumer preferences for trout steaks and, ultimately, to determine the viability of this product form. Using a probit analysis, fresh trout steaks were found to be more popular than frozen trout steaks. Consumers that exhibited significantly higher preference for fresh trout steaks were Hispanic, had high school education (or less), and/or believed that trout was less expensive than other meats. Chicago respondents and individuals with an urban background tended to display a higher preference toward frozen trout steaks.Consumer/Household Economics,


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    The impacts of socioeconomic/demographic characteristics, experiences and preferences of consumers on trout purchasing decisions were estimated using Probit and Ordered Probit regression techniques. Data from a survey of consumer purchasing behavior and personal attributes were used to deduce factors that led to either a high or low likelihood of purchasing trout products. Analysis of data pertaining to whole trout and value-added products yielded consistently different characteristics of consumers who show a high affinity toward purchasing one or more of such products. Results from these analyses were used to suggest techniques for marketing whole trout and value-added trout products to specific segments of the consumer population.Food Consumption/Nutrition/Food Safety,

    Costs of Pastured Broiler Operations Based on Data from Small-Scale Farms

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    Many small-scale and limited-resource farmers use hobby scale technologies to produce food for home consumption and as a source of supplementary income. However, the economic potential of many of these technologies has not been investigated. Raising poultry on pasture is a relatively common small-scale technology for which there is sparse production and economics information based on actual-farm data. This article provides such information, based on data from farms in Kentucky. Analysis indicated that live broiler sales might be marginally profitable but that greater profit can be realized through sales of processed broilers at farmers\u27 markets

    An electrokinetic route to giant augmentation in load bearing capacity of compliant microfluidic channels

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    The performances of lubricated systems widely used in natural, biological, and artificial settings are traditionally dictated by their load bearing capacities. Here we unveil that, by exploiting a unique coupling between interfacial electro-mechanics, hydrodynamics and substrate compliance, it is plausible to realize a massive augmentation in the load bearing capacities ofcompliant microfluidic channels. Our analysis demonstrates that the interplay between wettability and charge modulation in association with the solution chemistry and surface compliance results in this remarkable phenomenon. These results are likely to open up novel design paradigms of augmenting the load bearing capacities of miniaturized bio-mimetic units through the realization of a symmetry breaking phenomenon triggered by asymmetries in electromechanical and hydrodynamic transport over interfacial scales.Comment: 29 pages, 7 figure

    Moon Missions:The Way Ahead (NIAS/CSS/ISSSP/U/RR/10/2023)

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    The lunar missions gained impetus in the 21st century after decades of lull. The newer sprite in lunar missions began with orbiter and impact missions, which included India’s moon -impact probe onboard the Chandrayaan 1, in 2008. Subsequent robotic missions included orbiters, landers and rovers as well as sample collection missions. The Lunar south polar regions which is under permanent shadow is expected to have reserves of water-ice, essential for lunar habitation and as a source for future deep space missions(space) operating from lunar surface. Other Lunar resources include helium 3 a potential source for nuclear fusion reactors and other minerals which can be commercially exploited and in-situ resource utilization. Consequently, number of countries, space agencies and private parties are keen on lunar exploration. This report details the lunar explorations carried out and being planned, the initiatives taken by leading space faring countries and the technological aspects of lunar exploration. The role of international cooperation is emphasized

    "The fruits of independence": Satyajit Ray, Indian nationhood and the spectre of empire

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    Challenging the longstanding consensus that Satyajit Ray's work is largely free of ideological concerns and notable only for its humanistic richness, this article shows with reference to representations of British colonialism and Indian nationhood that Ray's films and stories are marked deeply and consistently by a distinctively Bengali variety of liberalism. Drawn from an ongoing biographical project, it commences with an overview of the nationalist milieu in which Ray grew up and emphasizes the preoccupation with colonialism and nationalism that marked his earliest unfilmed scripts. It then shows with case studies of Kanchanjangha (1962), Charulata (1964), First Class Kamra (First-Class Compartment, 1981), Pratidwandi (The Adversary, 1970), Shatranj ke Khilari (The Chess Players, 1977), Agantuk (The Stranger, 1991) and Robertsoner Ruby (Robertson's Ruby, 1992) how Ray's mature work continued to combine a strongly anti-colonial viewpoint with a shifting perspective on Indian nationhood and an unequivocal commitment to cultural cosmopolitanism. Analysing how Ray articulated his ideological positions through the quintessentially liberal device of complexly staged debates that were apparently free, but in fact closed by the scenarist/director on ideologically specific notes, this article concludes that Ray's reputation as an all-forgiving, ‘everybody-has-his-reasons’ humanist is based on simplistic or even tendentious readings of his work