In this study, larger clams (greater than 40 mm) become sluggish during burrowing rate experiments and had to be induced to burrow by aerating/stirring water (simulating swash conditions), whereas small clams (less than 40 mm) burrowed
in calm conditions.
To determine whether worms burrowed
faster by increasing their cycle distance or by increasing cycle frequency, velocities of each individual were plotted as function of cycle distance and cycle frequency to obtain a regression coefficient for the two relationships.
Most juvenile activity outside the burrowed
occurred in the early morning shortly after sunrise when the female was no longer active or visible at the burrow entrance.
Despite this variability, geoducks burrowed
significantly faster in the sand sediment than in the mud sediment (1.1 [+ or -] 0.08 mm/min and 0.67 [+ or -] 0.11 mm/min, respectively; Student's t = 3.13, df = 42, P = 0.003).
Because procambarid crawfish commonly burrow prior to oviposition, this study observed month of spawning for crawfish that burrowed
during the early months of the harvesting season (winter) in Louisiana.