Simple productivity indices for lake ecosystem: the case of Sampaloc Lake.

Date

1988

Abstract

Sampaloc Lake's productivity was estimated through the use of the Morphoedaphic Index (MEI). The MEI, derived from measures of total dissolved solids (or conductivity) and mean depth, provides the simplest and most general approach to the problem of initial estimates of potential yield in lakes and reservoirs in North America and Africa. Sampaloc Lake's annual MEI value for 1986 to 1987 was found to be 8.99 umho/cm/m, while fish production (captured fisheries only) was estimated to be at 428 kg/ha. These results were compared to the regression line for 17 African lakes. At the fish cage level, an exploratory analysis wa undertaken to determine the significant association of selected environmental and socio-economic parameters with cage productivity. In using a multiple linear regression and a multiple log-linear regression function, it was found that the latter gave the best fit. Sixty-seven percent of the variation in output (i.e. Tilapia nilotica yield) can be explained by the following explanatory variables: stocking rate, fish size at harvest, production cycle, education or years of schooling of the operator, depth, and harvesting system. Fish culture experience of the operator was also significant in the first model.

Document Type

Master Thesis

Language

English

LC Subject

Lake ecology -- Philippines -- Sampaloc Lake, San Pablo City, Sampaloc Lake

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1988 E8 M36

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