报道了在我国热带地区集约化养殖凡纳滨对虾Litopenaeus vannamei不同放养密度下水体pH值、溶解氧(Do)、总碱度(TA)、化学需氧量(COD)、生物化学需氧量(BOD)、硫化氢(H2S)、亚硝酸态氮(NO2-NT)、氨态氮(NH4-NT)及弧菌活菌总浓度(Concentration of Live Vibrio,CLV)的变化特征及其与对虾死亡之间的关系,并比较了70、100、120、150尾·m-2不同养殖密度下的养殖成活率.通过几种主要水质因子变化与对虾死亡数之间的相关性分析,结果表明,DO、H2S、NO2-NT、NH4-NT和CLV等5种水质指标与对虾大量死亡存在显著的线性相关,其中DO为负相关,其余为正相关.而pH、TA、COD、BOD与对虾死亡数无显著相关性.4种养殖密度下的成活率分别为80.44％、75.16％、51.74％和44.43％.建议我国热带地区集约化养殖凡纳滨对虾的合理密度为70-100尾·m-2.
Water quality and survival rate for intensive culture of white leg shrimp,Litopenaeus vannamei, under different cultural density in tropic area of China
This paper reports characters of nine water quality parameters, such as Ph, dissolved oxygen (DO), total alkali (TA), chemical oxygen demand (COD), biological oxygen demand (BOD), hydrogen sulfide (H2S), nitrogen of nitrite (NO2-NT), nitrogen of ammonia (NH4-NT), and concentration of live Vibrio (CLV), under different cultural density of Litopenaeus van-namei in a typical outdoor intensive shrimp farm located in Hainan province, a tropic area of China. The relationship between each parameter of water quality and the number of dead shrimp was explored. Statistical analysis suggested that the significantly related water parameters to shrimp mortality are DO, NH4-NT, NO2-NT, H2S, and CLV. There are typical linear regression relationships between these parameters of water quality and shrimp mortality. The other four water parameters, including Ph value, total alkali, COD, and BOD, do not significantly affect shrimp mortality. The survival rates are 80.44%, 75.16%, 51.74%, and 44.43% under four cultural densities of 70, 100, 120, and 150 PL·-2, respectively. The appropriate cultural density of Litopenaeus vannamei for the outdoor intensive system in a tropic area is suggest to be 70 - 100 PL·m-2.
NETL
NSTL
万方数据
维普
