This study examines the impact of private investment on economic performance in Nigeria using time series data from 1980 -2018. Multiple regression and co-integration methods are employed to analyze the data. The objectives of this study is to, among other things, examine the casual relationship between private investment and economic growth in Nigeria and to investigate the impact of private domestic investment on economic performance in Nigeria. Being a time series data, the first step is to test for the stationarity of the data by using Phillips Perron-Fuller unit root test. Ordinary least square (OLS) and Auto regressive distributed lag (ARDL) technique is used to estimate the models. The results of the unit root test show that some variables; Labour Force Participation rate (LPR), Private Domestic This study assessed problems of vertical integration among fish farmers in Rivers State, Nigeria. The paper looked at distribution of respondents’ socio-economic characteristics and problems of vertical integration among fish farmers in the study area. Data for the study was collected from 37 vertically integrated fish farmers that exist in the State. To analyze the data, collected descriptive statistics and Likert-type rating scale was used. The study revealed that the vertically integrated fish farmers were mostly within the range of 41-45 years, married having household size of 6-10 persons. The study revealed that the vertically integrated fish farmers were experienced, learned, and majored only as fish culture farmers. However, farmers complained of large capital required for starting, irregular electricity, sinking of local feed produced, poor drying of fish, and stressful activities of feed production, fingerling hatching and processing of fish. It was suggested that fish culture farmers should be provided with credit at low interest rate, up-to date knowledge in fish culture and extension services to enhance productivity.