Productivity and Efficiency
According to the U.S. Environmental Protection Agency, water efficiency is the smart use of our water resources through water-saving technologies and simple steps. Using water efficiently will help ensure reliable water supplies today and for future generations. Topics addressed in this theme provide insights, lessons, and guidance on how diverse stakeholders are working to improve water management and reduce water use.
Productivity and Efficiency Resources
Accuracy of Some Length-Based Methods for Fish Population Studies
Published:
January 1, 1990U.S. Agency for International Development
Length-based methods have lately found widespread use for the estimation of growth in fish populations, especially in tropical areas, because of the various disadvantages presented by "ageing" techniques such as otolith or scale examinations or tagging experiments. recent methods for the...Read more
Pond Dynamics/Aquaculture Collaborative Research Data Reports -- Volume Six, Number Three, Honduras Project: Cycle III of the CRSP Global Experiment
Published:
December 21, 1989U.S. Agency for International Development
The Pond Dynamics/Aquaculture CRSP has been studying the dynamics of tilapia production ponds in the tropics subjected to differing nutrient additions since the initiation of field experiments in January 1984. A low level of phosphorus, as triple-superphosphate, was added to ponds during the rainy...Read more
Regional focus:
Honduras, Latin America and the CaribbeanHatchery Techniques for Egg and Fry Production of Clarias Batrachus (Linnaeus)
Published:
December 1, 1989U.S. Agency for International Development
Egg hatching, and fry growth and survival of the walking catfish, Clarias batrachus (Linnaeus),were investigated under hatchery conditions in West Java, Indonesia. Spawning was environmentally induced in a specialized breeding pond. Gravid females utilized nests containing kakaban, a fibrous...Read more
Regional focus:
Indonesia, East Asia and PacificProject Management Workshop for the Irrigation Management Systems Coordinating Committee
Published:
September 3, 1989U.S. Agency for International Development
Coordination, communication, timely implementation, and avoiding duplication are the major challenges facing the irrigation management system coordination committee.Read more
Regional focus:
Egypt, Arab Rep., Middle East and North AfricaAge Determination and Growth for Two Corvinas, Cynoscion Stolzmanni and Cynoscion Squamipinnis in the Gulf of Nicoya
Published:
September 1, 1989U.S. Agency for International Development
Age determination and growth for two corvinas, coliamarilla (Cynoscion stoltzmanni) and aguada (Cynoscion quamipinnis), was studied. Validation of age determination on otoliths was carried out by the analysis of length-frequency analysis using the method of Macdonald and Pitcher (1979) and the...Read more
Regional focus:
Costa Rica, Latin America and the CaribbeanHydroacoustic Assessment of Fish Stocks in the Gulf of Nicoya, Costa Rica
Published:
September 1, 1989U.S. Agency for International Development
The Gulf of Nicoya, Costa Rica is a relatively shallow, tidally influenced estuary that supports a substantial artisanal fishery on various stocks, primarily corvinas. However, little is known about the population size or productivity of these stocks. While hydro acoustic techniques have been...Read more
Regional focus:
Costa Rica, Latin America and the CaribbeanFisheries Stock Assessment -- Title XII Collaborative Research Support Program: Continuation Proposal Amendment
Published:
September 1, 1989U.S. Agency for International Development
This document is an amendment to the Fisheries Stock Assessment Title XII Collaborative Research Support Program (CRSP) Continuation Proposal, May, 1989. The JCARD/BIFAD review committee suggested that the CRSP revise its work plans and budgets to a request for $704,000 per year rather than the...Read more
Catch - At - Length Analysis That Incorporates a Stochastic Model of Growth
Published:
September 1, 1989U.S. Agency for International Development
A length-structured population model, which incorporates von Bertalanffy growth, is used to describe changes in population abundance over time. The model is incorporated into a catch-at-length algorithm that uses a nonlinear least squares approach to estimate relative abundance, fishing mortality...Read more
Irrigation Technology and Commercialization of Rice in the Gambia: Effects on Income and Nutrition
Published:
August 1, 1989U.S. Agency for International Development
The potential for improving household-level food security in sub-Saharan Africa through new agricultural technology is assessed in this report. The study focuses on a project in The Gambia which introduced mechanical pump irrigation and improved drainage for rain fed and tidal irrigation to some 7...Read more
Regional focus:
Gambia, The, Sub-Saharan AfricaImportance of Mangroves in Sustaining Fisheries and Controlling Water Quality in Coastal Ecosystems [: Progress Report]
Published:
July 1, 1989U.S. Agency for International Development
The goal of this research program is to investigate specific mangrove properties under different types of geomorphology. Predictions of ecosystem function based on models of mangrove processes are presently restricted to specific environmental settings. Thus the application of mangrove management...Read more
Regional focus:
Latin America and the CaribbeanDon't see what you're looking for? You can search USWP member sites, request a resource, or contact the USWP.