THEILACKER: EFFECT OF STARVATION ON JACK MACKEREL 



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Figure 8. — Day 8, starved Trachurus symmetricus larva. Enlargement of Figure 6. Loss of integrity of midgut cells (8 s); atrophied 

 liver with dark staining and irregular nuclei (3 s); no acinar cellular arrangement in pancreas (7 s); separated muscle fibers (11 s); 

 swollen kidney (K); distended gallbladder (GB); note presence of yolk and oil (Y, O), and eosinophilic mass (EM) in liver. 480 x. 

 s = histological grade = "starved," M = muscle, MG = midgut, P = exocrine pancreas. 



Figure 9. — Day 8 fed larva. Large eosinophilic inclusions in hindgut (10 h); muscle fibers closely packed (11 h); thin, epithelial 

 integumental cells (EC) are prominent below gut and above trunk musculature. 200 x. h = histological grade ="healthy," 

 HG = hindgut, M = muscle, MG = midgut. 



Figure id. — Day 8, starved larva. Loss of cellular structure in hindgut; enlarged epithelial integument cells (EC); separated muscle 

 fibers (11 s). 200 x. s = histological grade = "starved," HG = hindgut, M = muscle, N = notochord, SP = spinal cord. 



Figure ll. — Day 7 larva, starved 2 days and histologically graded "intermediate." No inclusions in hindgut; cellular separation in 

 midgut (MG) and hindgut (HG); midgut cells sloughing (9 s); muscle fibers beginning to separate (11 i). 200 x. i = histological 

 grade = intermediate, s = histological grade = "starved," M = muscle, N = notochord, SP = spinal cord. 



Figure 12. — Day 7 larva, starved 2 days, graded "intermediate." Abundant intermuscular tissue (12 h); no muscle (M) fiber 

 separation; pancreatic nuclei (6 i) not distinct and cellular acinar arrangement lacking (7 i); midgut cells separating (8 i) and sloughing 

 (9 s). 480 X. i = histological grade = intermediate, s = histological grade = "starved," MG = midgut, P = exocrine pancreas. 



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