Study On Screening And Purification Effect Of Plants And Substrates In Ecological Fish Tanks

Design an ecological aquarium,build a reasonable and scientific system of hydroponic plants and submerged plants to ensure the concentration of dissolved oxygen in the water body,and select the best combination of hydroponic plants and submerged plants and matrix to achieve the effect of the tank without power.The aim is to ban traditional fish tanks,which rely on artificial water changes or aeration to increase dissolved oxygen content and require a lot of electricity,as well as environmental protection and energy conservation.Three substrates were selected in this paper:river sand,black brown soil and ceramsite sand as the cultivation substrates for submerged plants;Vallisneria natans and black algae were selected for submerged plants Hydrilla verticillata,Ceratophyllum demersum;Hydroponic plants were selected Alocasia(Alocasia macrorrhiza),guangdong evergreen(Aglaonema modestum),Schefflera(Schefflera octophylla);The orthogonal design experiment was carried out with three factors of hydroponic plants,submerged plants and substrates,in order to select the best combination of hydroponic plants,submerged plants and substrates,and finally the co-culture effect experiment of flower fish was carried out.The main research results are as follows:(1)Design of ecological fish tank:a glass tank with a length of 50cm,a width of 26cm,and a height of 38cm is produced.The top of the glass tank is provided with a planting frame of 20cm in length,26cm in width and 9cm in height.faucet switch.(2)Screening of the best combination of hydroponic plants,submerged plants and substrates:From the perspective of the growth of hydroponic plants:the combination of Schefflera oleifera and bitter grass is the best.From the perspective of the physiology of hydroponic plants:the detection data of malondialdehyde is the most suitable for the 26th combination;the superoxide dismutase test data evaluates the 15th combination with the best enzyme activity;the highest protease activity is the 25th combination;oxidation The combination with the highest hydrogenase activity is the combination 19;the combination with the highest peroxidase activity is the combination 19;the combination 19 is the best combination through all the above test data,namely Schefflera;bitter grass;river sand.(3)Screening of the optimal fish and fish co-cultured fish tails:In the ecological fish tank,Evergreen Green is matched with bitter grass,and the most suitable fish flower is co-cultivated as 4 koi.It can be combined with river sand and ceramsite sand to allow more than 3 fish to survive.Alocasia with hornwort can survive more than 3 koi.;Schefflera arborescens with bitter grass can survive 4 koi carps under different substrates.(4)According to the test results of plant growth physiology,water quality testing and plant-fish co-cultivation,Schefflera oleifera;bitter grass;river sand combination is the best.