不同培养条件对蒙古裸腹溞种群密度及水质的影响
Effects of Different Culture Conditions on the Population Density of Moina Mongolica and Water Quality

蒙古裸腹溞(Moina mongolica)为水产养殖重要的生物饵料，为了探究高效、低成本的培养方法，本试验在室内水温21~26℃，盐度为15，裸腹溞初始接种密度为40 ind./L，进行了2个验，1) 投喂微拟球藻(Nannochloropsis salina，A1)、对虾尾水沉积物(B1)、微拟球藻 对虾尾水沉积物(C1)、微拟球藻+ 有机酸(D1)、对虾尾水沉积物 有机酸(E1)；2) 以仅投喂微拟球藻为对照组(A2)，向养殖水体中添加1000 mg/L (5 mL) (B2)、2000 mg/L(10 mL) (C2)、3000 mg/L (15 mL) (D2)浓度的有机酸。连续培养22 d，结果表明：1) A1组蒙古裸腹溞最高密度、日均增长量、日均增长率和最终增长倍数均最高，分别为4203 ind./L、189.2 ind./(L·d)、21.2%/d和105倍。第22 d，该组水体中氨氮(TAN)和亚硝酸氮(NO₂^？-N)浓度最高，分别为2. 45 mg/L、0.53 mg/L，显著高于其他各组(P < 0.05)，A1组溶解氧(DO)浓度显著低于其他组(P < 0. 05)；2) D2组蒙古裸腹溞最高密度、日均增长量、日均增长率和最终增长倍数均最高，分别为4543 ind./L、204.6 ind./(L·d)、21.5%/d和113.6倍。第22 d，该组培养水体中TAN和NO₂^？-N浓度最低，分别为2.08 mg/L、0.46 mg/L，显著低于其他各组(P < 0. 05)，D2组DO浓度显著低于其他组(P < 0.05)。本试验条件下，投喂微拟球藻有利于蒙古裸腹溞种群增长，添加有机酸能够进一步改善水质，增强培养效果。
The Moina mongolica is an important live food organism in aquaculture. In order to explore efficient and low-cost cultivation methods, two experiments on culture of M. mongolica were carried out under indoor conditions in seawater with a water temperature of 21 ~ 26？C and a salinity of 15, 1) feeding Nannochloropsis salina (A1), sediments from shrimp tail water (B1), N. salina sediments from shrimp tail water (C1), N. salina organic acid (D1), and sediments from shrimp tail water organic acid (E1), and 2) feeding N. salina alone as the control group (A2) and adding 1000 mg/L (5 mL) (B2), 2000 mg/L (10 mL) (C2), 3000 mg/L (15 mL) (D2)volumes of organic acid simultaneously to the culture water as treatment groups. The initial inoculum density was 40 ind./L for 22 d of continuous incubation. Results showed that 1) M. mongolica in the A1 group had the highest maximum density, average daily growth, average daily growth rate, and final growth multiple with values of 4203 ind./L, 189.2 ind./(L·d), 21.2%/d, and 105.1 times, respectively. On the 22nd day, the highest total ammonia nitrogen (TAN) and nitrite nitrogen (NO₂^？-N) concentrations in the culture water were found in this group, which were 2.45 mg/L and 0.53 mg/L, respectively, and were significantly higher than those in the other groups(P < 0.05). The DO content in the A1 group was significantly lower than that in the other groups(P < 0.05); 2) M. mongolica in the D2 group had the highest maximum density, average daily growth, average daily growth rate, and final growth multiple, with values of growth of 4543 ind./L, 204.6