Im pact of total ammonia nitrogen on survival and grow th of larval and juvenile bay scallop Argopecten irradians
YUAN Hong-mei,YANG Chang-kui,YANG Feng,YAN Xi-wu
College of Fisheries and Life Science,Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province,Dalian Ocean University, Dalian 116023,China
Abstract: The effect of total ammonia nitrogen evel on survival and growth of larval and juvenile bay scallop Arg-opecten irradianswas studied to regulatewater quality during bay scallop larva rearing.The results showed the 24 h median effective concentration(EC50)of total ammonia nitrogen was 3.089 mg/L(NH3-N=0.194 mg/L)for hatching rate,with themaximum acceptable toxicant concentration(MATC)of0.86-1.80 mg/L(NH3-N=0.054-0.113 mg/L)atwater temperature of(21.5依22.5)益,pH 8.20-8.30,and a salinity of27-28.The LC50of to-tal ammonia nitrogen for 2-day-old pelagic larvaewas7.801 mg/L(NH3-N=0.342 mg/L)in 48 h,2.445mg/L (NH3-N=0.107 mg/L)in 96 h,and 1.294 mg/L(NH3-N=0.057 mg/L)in 144 h,with EC50of 2.023 mg/L (NH3-N=0.089 mg/L)in 144 h at pH 7.95-8.10,temperature 23-25益and a salinity of 27-28.The pelagic larvae had maximum allowable toxicant concentration(MATC)of 0.37-0.66 mg/L(NH3-N=0.016-0.029 mg/L)and themetamorphic larvae were observed at total ammonia nitrogen concentrations of 2.03 mg/L(NH3-N臆0.089 mg/L)or lower.Duringmetamorphosis stages(from eye-spot larva to juvenile),there was 192 h EC50of 1.460 mg/L(NH3-N=0.064mg/L),408 h EC50of1.927mg/L(NH3-N=0.085mg/L).It is suggested that total ammonia nitrogen concentration be controlled under 0.40 mg/L(NH3-N=0.018 mg/L)at pH 7.95-8.10, which provides some reference for bay scallop developmental ecology and water quality control in larva rearing.
袁洪梅, 杨长奎, 杨凤, 闫喜武. 总氨态氮对海湾扇贝幼体存活和生长的影响[J]. 大连海洋大学学报, 2017, 32(3): 268-274.
YUAN Hong-mei, YANG Chang-kui, YANG Feng, YAN Xi-wu. Im pact of total ammonia nitrogen on survival and grow th of larval and juvenile bay scallop Argopecten irradians. Journal of Dalian Ocean University, 2017, 32(3): 268-274.