EFFECTS OF MICROHABITAT TYPES ON DISTRIBUTION AND YIELD PERFORMANCE OF OREOCHROMIS NILOTICUS IN PORT BUNYALA BAY, LAKE VICTORIA (KENYA)

Citation

James Omolo, EFFECTS OF MICROHABITAT TYPES ON DISTRIBUTION AND YIELD PERFORMANCE OF OREOCHROMIS NILOTICUS IN PORT BUNYALA BAY, LAKE VICTORIA (KENYA)(2017)SDRP Journal Of Plant Science 1(1)

Abstract

Study was conducted to elucidate effects of different types of microhabitats on distribution and yield performance of O. niloticus. The distribution and yield performance structures were evaluated and compared among the four geo-referenced microhabitat types based on physicochemical characteristics. Total water depth, Water temperature, Dissolved Oxygen and Electrical conductivity, were measured in situ using YSI 650 MDS instrument. Water transparency, was determined using Secchi disk. One-Way ANOVA was used to describe variation in the measured variables, Tukey’s HSD Post-hoc test, was applied after completing an ANOVA in order to determine which groups differ from each other. Karl-Pearson regression and correlation, was used to measure the degree of relationship between physicochemical parameters, distribution and yield performance. Results indicate that O. niloticus distribution and yield performance having similar Spatio-temporal patterns with highest O. niloticus distribution in MH 3, (30.88%) followed by 26.12% in MH 4. Correlations between physicochemical parameters, distribution and yield performance were significant at the 0.05 significance levels. In conclusion, abiotic stress was found to cause the declining O. niloticus distribution with consequent decreasing potential yields between 90 and 70% while, there was significant correlation among environmental variables with yield performances.

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