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

Age Determination and Growth for Two Corvinas, Cynoscion Stolzmanni and Cynoscion Squamipinnis in the Gulf of Nicoya

Published: 
September 1, 1989
U.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 RicaLatin America and the Caribbean

Hydroacoustic Assessment of Fish Stocks in the Gulf of Nicoya, Costa Rica

Published: 
September 1, 1989
U.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 RicaLatin America and the Caribbean

Special Report: University of South Carolina, Scampi [South Carolina Aquaculture and Marine Internationals] -- January 30 - September 30, 1989: 1988/89 El Salvador Caps Program

Published: 
September 1, 1989
U.S. Agency for International Development
Objectives of Ihe program included improvement of the trainees' listening proficiency to a level at whichthey could understand simple conversations and short lectures on topics in areas of interest (includingaquaculture). This improvement was measured at the end of the training period by the...Read more
Regional focus: 
El SalvadorLatin America and the Caribbean

Irrigation Management in Relation to Waterlogging and Salinity

Published: 
September 1, 1989
U.S. Agency for International Development
This paper presents an overview of the current state of knowledge on the relationship between irrigation management in Pakistan and the incidence of waterlogging and salinity. It is emphasized that management research should focus on the whole system, including surface and ground water resources...Read more
Regional focus: 
PakistanSouth East Asia

Medium Scale Irrigation Systems in Northeast Thailand: Future Directions

Published: 
September 1, 1989
U.S. Agency for International Development
Appropriate sites for new irrigation development are increasingly hard to find, and many countries are choosing to rehabilitate existing systems instead. This study assesses the effectiveness and replicability of the Northeast Small Scale Irrigation Project (NESSI), which involved rehabilitation...Read more
Regional focus: 
ThailandEast Asia and Pacific

Fisheries Stock Assessment -- Title XII Collaborative Research Support Program: Continuation Proposal Amendment

Published: 
September 1, 1989
U.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, 1989
U.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, 1989
U.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, TheSub-Saharan Africa

Spatio - Temporal Variations in Community Structure on a Heavily Fished Slope in Bolinao, Philippines

Published: 
August 1, 1989
U.S. Agency for International Development
An analysis of variations in community structure along a heavily fished fore reef slope in the Philippines indicates that depth and heterogeneity at the 1 and 10 cm scales were dominant structuring factors. Bottom temperature also appeared to be influential, but its effect was difficult to isolate...Read more
Regional focus: 
PhilippinesEast Asia and Pacific

Earth Observing System and Coral Reef Fisheries

Published: 
August 1, 1989
U.S. Agency for International Development
The management of coral reef fisheries has been hampered by insufficient knowledge of their physical and biological characteristics. However, the Earth Observing System (EOS), a sophisticated array of satellite sensors which will be available by the mid-1990's, will increase this knowledge to...Read more

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