Abstract:The Yellow River estuary is a major fishery and spawning ground in the Bohai Sea. With the decrease of Yellow River runoff, the salinity of water in the estuary became higher, thus many researches focused on the study of ecological water requirement. In this experiment, we used the local dominant species Mactra veneriformis as target organism to detect the influence of high salinity stress on ingestion and growth by semi-static water. The results showed that, with the increase of salinity, the ingestion rate and daily growth rate of shell length and weight decreased. The ingestion rate increased firstly under sudden changes in salinities, and then increased. Through the One-Way ANOVA analysis, the thresholds of ingestion and growth were obtained as 26～28 and 22～24, respectively. Finally,the threshhold of the high-salt stress on ingestion and growth of Mactra veneriformis was determined as 22～24.
