To construct an effective circular mix-culture model and investigate its culture capacity, we established one small and one large systems, with white shrimp (Litopenaeus vannamei) and razor clam (Sinonovacula constricta) cultured in separate ponds. The culture water from the L. vannamei was pumped to the S. constricta, and the culture water from the S. constricta overflowed back into the L. vannamei via gravity. In trial I, we tested four culture densities (groups 1 – 4), and monitored water quality, growth indices, and digestive and immune enzyme activities. From the results, the nitrogen and phosphorus levels generally increased then declined after 56 days, and were lower in groups 1 and 2. The specific growth rate of group 2 was the highest. After 56 days, activities of four digestive enzymes were increased in group 2, and lysozyme activity was significantly decreased in S. constricta in groups 1 – 4; Alkaline phosphatase activity of L. vannamei was increased in group 3, but decreased in S. constricta in groups 2 – 4; Acid phosphatase activity was significantly higher in groups 1 – 3 (P < 0.05), while SOD and CAT activities were significantly elevated in group 2 (P < 0.05). Thus, we applied group 2 density for trial Ⅱ. In trial Ⅱ, nitrogen and phosphorus concentrations declined significantly during the latter stages, and growth indices were higher than the control (P < 0.05). The yields of L. vannamei and S. constricta were sig-nificantly higher than the control (P < 0.05). The results revealed a good circular mix-culture system with the optimal culture capacity for L. vannamei (40 ind m?2) and S. constricta (300 ind m?2), which provided a reference for the future culture of them.

HU Jiabao;ZHAO Chunpu;BAO Gege;LUO Yunhui;WANG Danli;XU Jilin;XU Shanliang

School of Marine Sciences,Ningbo University,Ningbo 315211,China

中国海洋大学学报（自然科学英文版）

[1]HU Jiabao;ZHAO Chunpu;BAO Gege;LUO Yunhui;WANG Danli;XU Jilin;XU Shanliang-.Optimal Culture Capacity of White Shrimp (Litopenaeus vannamei) and Razor Clam (Sinonovacula constricta) in a New Series-Connection Culture Model)[J].中国海洋大学学报（自然科学英文版）,2022(06):1641-1648

Shrimp,Clam,razor,overflowed

Optimal,Culture,Capacity,White,Litopenaeus,vannamei,Razor,Sinonovacula,constricta,New,Series,Connection,Model,To,construct,effective,circular,mix,model,investigate,its,capacity,established,one,small,large,systems,white,shrimp,clam,cultured,separate,ponds,water,from,was,pumped,back,into,via,gravity,In,trial,tested,four,densities,groups,monitored,quality,growth,indices,digestive,immune,activities,From,results,nitrogen,phosphorus,levels,generally,increased,then,declined,after,days,were,lower,specific,highest,After,enzymes,lysozyme,activity,significantly,decreased,Alkaline,phosphatase,but,Acid,higher,while,CAT,elevated,Thus,applied,density,concentrations,during,latter,stages,than,control,yields,revealed,good,optimal,which,provided,reference,future,them

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