Aquaculture Engineering Parameters.

Abstract

The main objectives of the present study were to use a semi­ intensive system for fish production, or design ponds and design system aeration, feeding, foods and different feeding rate fertilizer amount. Number of feedings daily, different soil used (clay, sandy) were used with different water sources (lakes, drainage and Nile). In this study we obtained that Results 1-average of dissolved oxygen (DO) : during the experiments showed that th'e design system aeration higher than another systems. 2- Body

mass gain :Highest averages body mass gain was observed for treatment (S) (design system aeration) or (automatic demand feeder), Nile water, rectangular pond and layers sandy soil used the bottom of the bond in experiment .I (rectangular concrete). Highest averages BMG gain was. observed for treatment (6) {vertical pump system aeration) or (demand feeder), circular cages, Nile water, and layer clay soil in the bottom of the bond in experiment •].Highest averages BMG gain was observea for treatment ( 150 kg B) (design system food and aeration system), medium the pond lateral of the wind on method fertilizer) and 150 kg (chicken manure) per month in experiment 2. Highest averages BMG gain was observed for treatment (5% B) mechanical feeding (A), mechanical aeration (center 4 tube) at medium the pond lateral of the wind and 5% feeding rate in • experiment J. Highest averages BMG gain was observed for treatment 6 (mechanical feeding and fertilizer by design system of medium the pond lateral of the wind and three daily method at I0, 12 and 2 hour) in experiment 4. 3- Final BM and BMG: Highest final BM and BMG were obtained by treatment 5 (design system aeration, automatic demand feeder, Nile water and layer sandy soil of the bottom rectangular pond) in experiment I. Highest final BM and BMG were obtained by treatment 6 (circular cage, demand feeder: vertical pump aerationNile water and layer clay soil of the bottom circular cage) in experiment I. Highest final BM and BMG were obtained by treatment 5% B (automatic demand feeder, center 4 tube aeration and 5% feeding rate) in experiment 3. 4- Specific growth rate (SGR) : Treatment 5 showed the highest SGR value {automatic demand feeder, Nile water and layer sandy soil of the bottom rectangular pond) in