Left upper: Standard errors of the estimates of the exponent and constant values of the regression line between ln(FL) and ln(BWT) for four species of scombrids. Right upper: plot of the four power curves of fork length (mm) and live body weight (g). The black line is BET, blue is YFN, red is ALB, and SKJ is cyan. Below left: The percent error in estimating weight between the two curves that are widest apart (ALB and SKJ).