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Wednesday, January 27 • 2:40pm - 3:00pm
Improving Polyculture Systems In Rural Nepal For Farmers; An Optimal Stocking Density Analysis of Two Small Indigenous Species (SIS)

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AUTHORS: Bailey A. Keeler*, University of Michigan; James S. Diana, University of Michigan; Madhav Shrestha, University of Nepal

ABSTRACT: Adding small indigenous species (SIS) to polyculture ponds in rural Nepal has potential to improve livelihoods for farmers and their families. However, there has been little research on determining an optimal stocking density for SIS, the resulting production of SIS and large carp, the availability of SIS for household consumption, and the economic impacts. Currently, farmers do not intentionally stock SIS as they see SIS entering the system naturally. This research provides evidence to help fisheries managers better understand SIS potential and advise on optimal pond stocking strategies, so that farmers can efficiently use their pond space and increase the economic, nutritional, and environmental sustainability of carp culture in the region. The main goal of this research is to identify an optimal stocking density of two SIS (punti and dedhuwa) within a typical carp polyculture system, and to assess impacts and interactions with large carp production, water quality, periphyton growth, and economic returns. Twelve 200 m2 ponds were stocked (August 2013) using 3 treatments and a control. SIS stocking densities were chosen based on a literature review, and were widely varied to clearly show differential impact(s) and identify an optimal stocking density. Water quality measurements were taken weekly, diurnal oxygen measurements were taken bi-monthly to estimate primary productivity, and partial harvests were taken monthly to assess carp growth. All fish were harvested after 5-month grow-out period. Results show SIS densities had no direct effect on large carp production, punti production, or water quality. Density of dedhuwa seemed to have an inverse effect on production; highest stocking density treatments showed lowest production. Other factors affecting production are explored including interconnectedness of ponds & canals, and predation. These results, along with information gathered in a budget analysis, provide insights to the trade-offs associated with different pond stocking strategies.

Wednesday January 27, 2016 2:40pm - 3:00pm EST

Attendees (4)