Research On Optimization And Aquaculture Performance Of Recirculating Aquaculture System Of Cynoglossus Semilaevis G(u|¨)nther

This research take Cynoglossus semilaevis Giinther as experimental material, by means of a serious of contrast experiment, discuss the superiority of recirculating aquaculture mode to flow through aquaculture mode, preliminary confirm the superiority technology process and optimum economic operating parameter.The adaptability characteristic in growth, physiology and development of Cynoglossus semilaevis Gunther in recirculating aquaculture mode, preliminary confirm the optimum stocking density. Also evaluate the aquaculture effect and environmental sustainability with economics and emergy theoretical analysis method. Main research result as follows:1.Breeding variance analysis of Cynoglossus semilaevis adult fish in recirculating and flow through aquaculture mode1) Recirculating aquaculture mode has more superiority than flow through aquaculture mode, the survival rate can promote10%, growth rate can promote20%, and2month was saved with adult fish aquaculture period on equal conditions.2)Aquaculture object have more superiority in physiology performance and immunocompetence in recirculating aquaculture mode than in flow through aquaculture mode.3) Cynoglossus semilaevis development in recirculating aquaculture mode1month earlier than flow through aquaculture mode.That means recirculating aquaculture mode provide better water condition, have superority in parent fish rearing.4) Flow through aquaculture mode has obvious superiority in crude protein, amino acid and PUFA, while recirculating aquaculture mode has obvious superiority in crude fat and MUFA, that means recirculating aquaculture mode is more suit for Cynoglossus semilaevis’s fatten.2.The research of optimization of production process in Cynoglossus semilaevis recirculating aquaculture system1)UV-device postposition is suitable for closed recirculating aquaculture system.2)Perfect ozone addition positon is after biofilter and best ORP is356mv in water.3)The best gas water ratio in biofilter in recirculating aquaculture system is1.25:1.4)In this experiment condition, water treatment effect and aquaculture environment are best when daily circulation times is18.3. The research of optimum stocking density of Cynoglossus semilaevis adult fish in recirculating aquaculture mode1)In this experimental condition,the intial stocking density210group got the best Breeding effect, the month average survival rate is98.72%, month average weitht gain rate is0.1526kg/pcs, after7months breeding, per volume output is23.03kg/m3.2) The month survival rate of Cynoglossus semilaevis in recirculating aquaculture mode was in94.29-100%,weitht gain rate was above125g/pcs,. The water entainment recirculating aquaculture mode offered can vastly excavate Cynoglossus semilaevis’s growth potential,especially in fast growth period adult fish, in recirculating aquaculture mode, the breeding period can be greatly shoreten and producation output can be double.3)In recirculating aquaculture mode, Cynoglossus semilaevis have more operiority in physiology performance and immunocompetence, it has great competitiveness in resist illness,reduce medicine and promote fish aroma and quality.4. The contrast research of economic efficiency and ecological emergy of Cynoglossus semilaevis adult fish in recirculating and flow through aquaculture mode1)The recirculating aquculture mode can save electricity54.55%,coal93%,water98%,have notable water and energy conservation effect.2)The recirculating aquaculture mode have week realable on environment, show a higher production degree, have a obvious superiority in breeding effect, have a better resist risk ability.3)The flow through aquaculture mode make use of34.77%environment emergy investment, once showed a great life vitality, but with10years of disorder utilize of underground water and terrestrial heat, have caused huge destroy to environment ecosystem, which is a kind of typical accumulating effect human being production pattern’s destroy to environment quality.4)Envirnment emergy investment is only1.08%in recirculating aquaculture mode, EYR is higher than flow through aquaculture mode and ELR is0.3134, which showed a higher environmental sustainability and capacity, can greatly alleviate the pressure of environment,provide rehabilitate time of under ground water and terrestrial heat resource.