FISHERY BULLETIN: VOL. 87, NO. 3, 1989 

 Table 3. — Midgut cell height (mght) statistics for six diets by northern anchovy size. 



-? 32.0 r 



m 



X 



LU 

 O 



o 



Q 



24.0 - 



16.0 - 



8.0 



12.0 18.0 24.0 



HISTOLOGICAL SCORE 



Figure 3. — Engmulis mordax larvae, regres- 

 sion of midgut cell height measurement on his- 

 tological score. 



midgut cells decreased from the fed to the 

 starved state. The average height of the midgut 

 cells in fed fish <4.00 mm was 20.5 |jim. The 

 height averaged 15.6 ixm when feeding was de- 

 layed one day, 12.6 ixm for a 2 d delay and 11.8 

 (xm for a 3 d delay in feeding. The mean midgut 

 height for larvae starved 1 and 2 days was 13.5 

 |xm and for the 3 and 4 d starved group was 10.4 

 |xm (Table 3; Fig. 5). 



The height of midgut cells of the fed group 

 (fed) and those where feeding was delayed 1 day 

 (Sl/F) was different from all other groups 

 (ANOVA P's < 0.01; Table 4). Fish starved 3 

 and 4 days (S3&4) also differed from all others 

 (P's < 0.05 level). On the other hand, midgut cell 

 heights of larvae starved 1 and 2 days (S1&2) 

 were not different from those of larvae in which 

 feeding was delayed 2 or 3 days (S2/F and S3/F) 

 (P's = 0.16 and 6.17; Table 4). The f-test matrix 

 indicated four distinct diet and cell height 



28.0 



i 21.0h 



UJ 



z 



UJ 



o 



I- 



3 



o 



Q 



14.0 - 



7.0 - 



3.0 4.0 5.0 6.0 7.0 



STANDARD LENGTH (mm) 



8.0 



Figure 4. — Midgut cell height measurements for KngrauUs tnurdax 

 larvae that were raised in the laboratory. Fish were either fed, starved, 

 or feeding was delayed. 



462 



