Larval Genyonemus lineatus and Seriphus politus collected using bongo frames fitted with 0.333 mm mesh nets between December 2003 and September 2004 off Huntington Beach, California, were examined to characterize their daily growth patterns. Samples from one net were fixed in a 4% buffered formalin-seawater solution while those from the other net were preserved in 70% ethanol. All formalin-fixed samples were transferred to 70% ethanol ~72 hours after collection. Growth was best described by a linear equation for G. lineatus (L = –0.833 + 0.242A; R2 = 0.84) and a power function for S. politus (L = 0.825 × A0.647; R2 = 0.76). Sufficient S. politus were available to analyze seasonal effects on growth rate; no significant differences were detected. No significant difference in the S. politus growth rate between preservation media was detected for samples collected on September 1, 2004.