338 



Fishery Bulletin 93(2). 1995 



Table 3 



Regression equations for adjusting the size of larval walleye pollock, Theragra chalcogramma, exposed to various conditions that 

 cause shrinkage. 



Shrinkage type 



Live SL 

 range (mmi 



Regression equation 



la) Laboratory shrinkage in Bouin's' 



lb) Laboratory shrinkage in Z-Fix 2 - 3 



lc) Laboratory shrinkage in 5% formalin 4 



Id) Laboratory shrinkage in ethanol (95%) 4 



2) Net treatment, 5 min 



3) Net treatment, 7.5 min (interpolated) 



4) Net treatment, 10 min 



5) Net treatment, 15 min 



6) Net treatment, 20 min 



7a) Shrinkage in Bouin's after net treatment' 



7b) Shrinkage in Z-Fix after net treatment 3 



7c) Shrinkage in 5% formalin after net 

 treatment 3 



5.27-7.06 47 



5.20-7.60 56 



4.20-20.00 42 



5.80-18.90 42 



4.48-9.90 135 



4.48-9.90 134 



4.48-9.90 97 



4.96-9.90 71 



5.52-8.24 18 



5.36-7.84 35 



4.48-8.40 



50 



live SL = 0.617+1. 033( laboratory preserved SL) 0.88 



live SL = 1.047(laboratory preserved SL) 0.99 



live SL = 0.344+ 1 .02 1( laboratory preserved SL ) 0.98 



live SL = 0.296+0.929( laboratory preserved SL) 0.99 



liveSL=0.509+0.994(NLSL 5 ) 0.93 

 live SL=0.703+0.988(NL SL) 



live SL=0.974+0.983(NL SL ) 0.90 



liveSL=1.26+0.961(NLSL) 0.87 



liveSL=2.26+0.841(NLSL) 0.84 



NL SL = 1.118(preserved SL) 0.99 



NL SL= 1.036(preserved SL) 0.99 



NL SL = 1.0971 preserved SL) 0.99 



' Laboratory shrinkage = live larva placed directly into preservative. 



2 Z-Fix histological preservative, 10% formalin with aqueous zinc and buffers (see text). 



3 In some cases the constant was not significant and was removed from the regression. 



4 Data provided by K. M. Bailey, Alaska Fisheries Science Center. 



5 NL SL = net live standard length (size after net treatment before preservation). 



