Microcosmic characteristics of annual changes in salinity in sea cucumber Apostichopus japonicus culture ponds
BI Li－xian1， SANG Tian－cheng2， LIU Dan1， LOU Si－yi1， LIAO De－jie1，CHEN Ji－feng1， GUO Chao1， ZHOU Wei1，3
1.College of Fisheries and Life Science， Dalian Ocean University， Dalian 116023， China； 2.College of Economics and Management， Dalian Ocean University， Dalian 116023， China； 3.Dalian Fisheries Association of Industrial Technology Innovation， Dalian 116023， China
Abstract: The annual changes in salinity in upper layer and bottom of water and diurnal and vertical changes in salinity in the representative days of four seasons were monitored in a sea cucumber Apostichopus japonicus culture pond in Lüshun， Liaoning Province to understand the change and formation mechanism of halocline in a sea cucumber culture pond.The salinity in water upper layer in the pond was found to vary from 24.6 to 31.7，and under from 28.4 to 31.7，at bottom in summer.There were differences in salinity between water upper layer and bottom in the pond，higher than in the water upper layer and from July to September and December to March of the following year.Diurnal and vertical changes in salinity were observed in summer and winter，with large range of variation in summer.No diurnal changes in salinity were observed under water layer of below 120 cm in summer and below 60 cm in winter，indicating that salinity in upper layers fluctuate greatly and stable in the low layer of the water.
2017, Vol. 32 
