Figure 3. Swimming inhibits multiple behaviors. (A) Swimming worms reduced the rate at which they laid eggs. (B) Feeding worms with DiI allowed us to observe alimentary behaviors as well as their fluorescent excreta (arrowheads). (C) Swimming worms interrupted their defecation cycles. (D) DiI was also used to ascertain the feeding behavior of worms crawling on (i) and off food (ii), as well as those swimming in water (iii) or dopamine solutions (iv). (E) Worms crawling on and off food readily ingested the DiI solution. However, worms swimming in a DiI solution did not ingest the dye unless dopamine was also present.