Analysis On Farming System Of Super-intensive And Effect Of Main Factors On Growth,Immunity And Nutrient Budgets In Shrimp

Shrimp super-intensive farming is spring up in our country. The main differences between super-intensive and extensive farming are establishment and stocking density. In order to understand super-intensive farming system, extensive farming system was used as blank control, wastewater characterization, structure and benefit were analyzed. The effects of stocking density and dissolved oxygen (DO) concentration etc on growth, survival, ingestion, feed conversion efficiency (FCE) and non-special immunity factors (PO,SOD,POD,Ua,Ul,etc.) in shrimp were discussed. The main results are as follows.1 Analysis on Structure and Benefit in Super-intensive and Semi-intensive Shrimp Farming SystemsThe abundance of phytoplankton, zooplankton, benthos and water quality factors were observed and discussed in super-intensive and semi-intensive farming ponds in this experiment. The results showed that the numbers of phytoplankton (22 815 inds/ml < 31 590 inds/ml), zooplankton(490.5 inds/L < 650.0 inds/L) and benthos(4.5 inds/10 cm~2 < 267.5 inds/10cm2) were higher in semi-intensive than super-intensive farming ponds; DO, TAN and PO4-P concentrations were higher in super-intensive than semi-intensive farming ponds; Shrimp growth gain, growth rate and survival rate in super-intensive farming ponds were lower than those of semi-intensive farming ponds, but stocking density of super-intensive farming was higher, which can offset the low growth rate. So super-intensive farming could gain higher production than semi-intensive farming.2 The Difference of Wastewater Characterization Between Super-intensive Indoor and Semi-intensive Outdoor Shrimp FarmsNitrogen and phosphorus in aquaculture wastewater may cause many...