slack tide

1. The hybrid sturgeon in cement pool had the habit of hiding during the day and coming out at night, while that in deep water cage stayed at the base in riptide and swam in slack tide.
   水泥池养殖的杂交鲟具有昼伏夜出习性，深水网箱养殖的杂交鲟流急时在网箱底部活动、流缓时到水层中游动；

noun

1. the occurrence of relatively still water at the turn of the (low) tide

   Synonym:    slack water