. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 152 D. L. LOVETT AND D. L. FELDER Q 020 o 3 O (E O UJ I 015 0 10 005. 51-31-31 N Z M 10 14 17 21 24 140 PL DEVELOPMENTAL STAGE Figure 7. Ratio of volume of hepatopancreas (in early stages, vol- ume of anterior midgut caeca plus lateral midgut caeca) to total body volume for developmental stages of /V/n/fi/.v sctifcrus. Areas were mea- sured on 8 nm serial sections of formalin-fixed, paraffin-embedded specimens. Volumes were calculated by summing frusta. Error bars in- dicate 95% confidence interval about mean ratio of volume
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 152 D. L. LOVETT AND D. L. FELDER Q 020 o 3 O (E O UJ I 015 0 10 005. 51-31-31 N Z M 10 14 17 21 24 140 PL DEVELOPMENTAL STAGE Figure 7. Ratio of volume of hepatopancreas (in early stages, vol- ume of anterior midgut caeca plus lateral midgut caeca) to total body volume for developmental stages of /V/n/fi/.v sctifcrus. Areas were mea- sured on 8 nm serial sections of formalin-fixed, paraffin-embedded specimens. Volumes were calculated by summing frusta. Error bars in- dicate 95% confidence interval about mean ratio of volumes are indi- cated for each developmental stage (n = 3). N, nauplius stage 5; Z, protozoeal stages 1-3; M, mysis stages 1-3; PL, age of postlarvae in days. carbohydrate in the postlarval diet. A similar response to elimination of starch from the diet was observed by Hernandorena (1982) in Artemia. However, such a re- sponse is contrary to an assumption that is widely held among aquaculturists: that enzyme activity is high for those substrates most common in the diet. An additional problem associated with the use of en- zyme activity to evaluate diet is that the stage of molt cycle, nutritional status of shrimp, season, sexual condi- tion, and ontogenetic stage have been shown to affect size, histological condition, water content, and protein content of the hepatopancreas, (Cuzon el ai. 1980; Rosemark el ai. 1980; Van Wormhoudt et 1980; Van Wormhoudt and Sellos, 1980; Storch et ai. 1982; Barclay et ai. 1983; Pascual et ai. 1983; Storch and An- ger, 1983; Lee, 1984; Lee et ai. 1984; Storch et ai. 1984; Vogt et ai. 1985). Thus, the units selected to express en- zyme activity (either activity per mg protein in hepato- pancreas, activity per g wet weight of hepatopancreas, ac- tivity per mg protein in whole shrimp, or activity per g wet weight of shrimp) can affect whether significant change in digestive enzyme activity is reported (Cuzon et ai. 1980; Van Wormhoudt et ai.
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