Fig. 4From: Effects of passive integrated transponder (PIT) implantation on Pacific lamprey ammocoetesMean time that PIT-tagged ammocoetes (triangles) and untagged controls (circles) were able to sustain swimming at either 5, 6, or 7 cm/s water velocity. Results are given for the first (solid symbols) and second (open symbols) tests, separated by a 15-min rest period for each lamprey. Error bars represent standard deviation of each meanBack to article page