As macrophytes have considerable structrual variation for prey communities by hindering predator foraging and affect the predator behavior, the swimming and feeding behavior of planktivore (Pseudorasbora parva) with their prey (Daphnia pulex) were studied in laboratory experiments with varying densities (350, 700, 1400, 2100 and 2800 stems·m^-2) of artificial submerged vegetation and with different prey densities (0.5, 1, 2, 5, 10 and 25 prey·1^-1). The swimming speed of the fist was found to be negatively related to the prey density; and a significant change in swimming speed was noted as being directly related to the level of satiation The maximum feeding rates was found to depend upon and snow a marked variation with average prey distance. As the stem density gradually increases, the predator's foraging efficiency decreases considerably relative to feeding in open water. Moreover, a good relation in the feeding rate and swimming speed exists with the average stem distance to fish body length ratio (D). Abrupt reduction in feeding and swimming was recorded when D was near 0.7, which is approximately equal to one stride length of a fish.