The acorn barnacle, Balanus glandula, has been shown to exhibit tidal zone-dependent differences in anaerobic capacity and cirral behavior. Specifically, barnacles in the low intertidal had higher lactate dehydrogenase (LDH) activity and spent less time cirri beating while submerged than conspecifics from the high intertidal. We hypothesize that increased LDH activity in low intertidal B. glandula results from increased predator exposure, and thus more prolonged shell closure, during longer periods of immersion. To explore this, we measured the density of B. glandula and the predatory snail Acanthinucella spirata across tidal heights at several intertidal sites in California. And in the lab, we compared barnacle cirral activity in the presence and absence of A. spirata. We found the density of both barnacles and snails was significantly higher in the low intertidal relative to the high at all field sites. Further, 10% fewer barnacles were feeding during the first 1.5h of predator exposure, compared to unexposed barnacles, though this pattern disappeared by 24h. While more predators were found in the low intertidal, their effects on barnacle behavior were small and short-term, and therefore unlikely to alter LDH activity. This led us to question the universality of the tidal height effects on LDH and cirral beating in B. glandula. Unfortunately, we could not replicate the original relationship between tidal height and LDH activity at several novel intertidal sites. Barnacles from the high intertidal, however, still engaged in more cirral beating than those from the mid or low. The effects of tidal position on anaerobic metabolism in B. glandula may not be as pronounced as originally thought, though feeding behavior is still linked to tidal height.