The effects of Moina artificial diet and nutrase xyla supplemented artificial diet on growth and survival of Clarias gariepinus larvae

An experiment was carried out to investigate the effects of Moina, artificial diet (55% CP) and nutrase xyla supplemented artificial diet on growth performances and survival rates of Clarias gariepinus larvae. A combination of Moina and artificial diet (with or without nutrass xyla) resulted in higher growth performance and survival rates during a 12-day nursing time with specific growth rates of 30.04-32.15% d super(-1) and survival rates of 87.5-90%. Best growth performance and survival rate was obtained with a combination of Moina and artificial diet supplemented with nutrias xylem. Feeding of Moina and artificial diet supplemented, with nutrias xyla alone to the larval led to a lower growth performance of 25.60-27.04% d super(-1). However, the survival rate of Monia of larvae fed a combination of Moina and artificial diet (with or without nutrias xylem supplementation) artificial diet without nutrias xylem addition proved relatively less suitable for larval rearing of Clarias gariepinus owing to a low survival rate of 69% and growth performance of 19.7% d super(-1). This study showed the feasibility of feeding a combination of Moina and nutrias xylem supplemented artificial diet to the larvae of Clarias gariepinu

Design and Construction of Parabolic Solar Heater Using Polymer Matrix Composite

A parabolic dish is a type of concentrating reflective device that uses the shape of a circular paraboloid to collect or project energy such as light, sound, or radio waves. The parabolic reflector transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. In this work concentrating dish was moulded from polyester resin reinforced with fiber glass mat and inner surface lined with Aluminum foil to increase the reflectivity. The design was made up of a moulded dish of 246cm diameter with a height of 58.2cm which has a concentration factor of 54.9. The collector was mounted on a site with latitude 6 40 22.19 and longitude 3 09 47.12 and water at 270C was heated to a temperature of 850C within 20 minutes

Electromechanical Systems in Building Services Engineering

There are myriad of electromechanical systems in domestics, commercial and industrial buildings. Part or most of these systems hardware are hidden from the public though they do account for between 50% to 75% of the total construction cost and take up to 15% of the building volume. This paper is aimed at enumerating their functions as a prerequisite for designing (including modelling and simulation), selecting, integrating, managing and reduction in energy usage. The electromechanical systems included in this paper are cold and hot water supplies, heating, ventilation, air conditioning, drainage, sanitation, refuse and sewage disposal, gas, electricity, access control, communication, oil installation, fire fighting and transportatio