A variable growth rate modification of von Bertalanffy's equation for aquaculture

In aquaculture experiments of only a few months'duration, fish can approach their asymptotic size and growth rates may change greatly. One objective of aquaculture is to obtain a maximum economic return, and a growth model is needed to relate rate of growth to food consumption and other costs to find the optimum duration of growth cycles. Von Bertalanffy's equation is an asymptotic growth model which can be used for this purpose. A variable growth rate model was developed to describe fish growth oscillations observed in aquaculture experiments. This growth model provides improved estimates of von Bertalanffy's equation in aquaculture and can be used for an efficient evaluation of fish production during production cycles.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73180/1/j.1365-2109.1994.tb00689.x.pd

Surviving Vietnam's coffee boom and bust

SANREM CRSP researchers Dang Thanh Ha of Vietnam's Nong Lam University and Gerald Shively of Purdue University examined small farmers' responses to the boom and bust in Vietnam's coffee economy. Using data from 1999 and 2003 surveys of coffee farms, the researchers analyzed responses to falling prices. They took into account the role of ethnicity, the importance of access to irrigation, and households' subjective outlook on future coffee prices. The data identified four patterns of farmer response to plummeting prices:SysCoor-5 (Policy and Governance

SANREM CRSP Newsletter, May 2008

ME (Management Entity

SANREM CRSP News, February 2011

ME (Management Entity

Developing social infrastructure for effective NRM

Effective natural resource management (NRM) in Mali must address methods of conflict avoidance and management. Collaborating with local Natural Resource Management Advisory Committees (NRMACs), SANREM researchers have outlined a process for improving conflict and natural resource management at the commune/multi-village level.ME (Management Entity

GLOBALIZING NWP? The Latin America report

The presentation is an assessment report of the Nature, Wealth, and Power paper for Latin America. It addresses strengths, weaknesses, gaps, and required modifications of the paper

SANREM CRSP Newsletter, May 2007

ME (Management Entity

Network opportunities for promoting conservation agriculture: Bungoma, Kenya

This brochure summarizes the findings of the SANREM CRSP Technology Networks Cross Cutting Research Activity in Bungoma, Kenya. This includes a description of beliefs about the three main principles of conservation agriculture before project activities began and a map of the agricultural production network in Bungoma, Kenya. Key nodes for the transmission of information are also identified. The brochures were distributed accompanying a presentation "Technology networks for conservation agriculture: Bungoma, Kenya" and feedback workshop in Bungoma held 14 February 2012. Additional copies of the brochure have remained in the local area for distribution by the local team.CCRA-8 (Technology Networks for Sustainable Innovation

Subsistence farmers move into the market

Improved transportation and communication infrastructure have increased market access for farmers in the Philippines. This increased exposure has resulted in a shift from traditional subsistence farming to commercial production. Understanding this production shift will increase the effectiveness of national economic reforms transmitted through market prices.BA-1 (SANREM Research in Southeast Asia