HOUDE and LUBBERS: SURVIVAL AND GROWTH OF STRIPED BASS 



Table 4.— Summary of data and analyses from 2 m 3 enclosure experiments in the Manning Hatchery pond, 1983. Three replicate 

 enclosures were run for each type of larva: Striped bass (SB), striped bass x white bass (WBX), and striped bass x white perch (WPX). A) 

 Mean standard lengths and wet weights at 9 d after hatching, prior to stocking in enclosures. B) Percent survivals at 30 d after hatch- 

 ing. C) Mean lengths and weights at 30 d after hatching. D) Growth-in-length equations (/, = standard length in mm at age f; f = 

 days after hatching; S b = standard error of the regression coefficient; r 2 = coefficient of determination). E) Exponential, growth-in- 

 weight equations (W t = wet weight in mg at age f ; f = days after hatching; S G = standard error of the exponential coefficient; r 2 = 

 coefficient of determination). F) Power function equations of the wet weight-standard length relationships (W = wet weight in mg; / = 

 standard length in mm; S b = standard error of the power coefficient; r 2 = coefficient of determination). 



'Significant at P < 0.05. ANOVA. 



zThe WBX and WPX exponential coefficients differed significantly, P < 0.05, from the SB coefficient. ANCOVA followed by SNK multiple comparison procedure. 



3 The WBX power coefficient differed significantly, P < 0.05, from the SB and WPX coefficients. ANCOVA followed by SNK multiple comparison procedure. 



oratory and in freshwater pond enclosures, demon- 

 strated clearly superior growth or survival. The 

 apparent heterosis in young-of-the-year and sub- 

 adult white bass hybrids (Logan 1968; Ware 1975; 

 Bonn et al. 1976; Williams et al. 1981; Kerby et al. 

 1983) was not evident during the first month after 

 hatching. Survival and growth rates of the three 

 types of larvae were relatively high in all of our ex- 

 periments, indicating that striped bass and its 

 hybrids may have near-equal production potential 

 up to 30 d of age. 



Larvae grew and survived surprisingly well at the 

 relatively low food concentrations that we offered 

 in the laboratory. There was evidence that striped 

 bass and white perch hybrid larvae grew faster at 

 the 500 L _1 than at the 100 L _1 Artemia concen- 

 tration but there was no significant difference in size 

 of white bass hybrid larvae reared at those two food 

 levels. Survival of all three types of larvae did not 

 differ between the two food levels, demonstrating 

 that high survival and favorable growth can be ob- 



Figure 2.— Mean wet weights ± 2 standard errors of striped bass (SB), 

 striped bass x white bass (WBX), and striped bass x white perch 

 (WPX) larvae from 6 to 30 d after hatching, reared at two food levels 

 in the laboratory. 



E 



J? 



a> 



"3 



5 



Days after Hatching 



911 



