. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 51-31-31 4 7 10 14 17 21 24 35 " 140 N Z M PL. TRYPSIN (TAME) 030 010 000 51-31-31 4 7 10 14 17 21 24 "35 " 140 N Z M PL CARBOXYPEPTIDASE B I--*" 51-31-31 4 7 10 14 17 21 24 35 140 N Z M PL 51-31-31 4 7 10 14 17 21 24 35 140 N Z M PL DEVELOPMENTAL STAGE Figure 3. Specific activity of trypsin (with substrate indicated), carboxypeptidase A, and carboxypepti- dase B for developmental stages o'iPenaeu* setijerus, obtained from whole-animal homogenates. Activity expressed as International Units of activit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 51-31-31 4 7 10 14 17 21 24 35 " 140 N Z M PL. TRYPSIN (TAME) 030 010 000 51-31-31 4 7 10 14 17 21 24 "35 " 140 N Z M PL CARBOXYPEPTIDASE B I--*" 51-31-31 4 7 10 14 17 21 24 35 140 N Z M PL 51-31-31 4 7 10 14 17 21 24 35 140 N Z M PL DEVELOPMENTAL STAGE Figure 3. Specific activity of trypsin (with substrate indicated), carboxypeptidase A, and carboxypepti- dase B for developmental stages o'iPenaeu* setijerus, obtained from whole-animal homogenates. Activity expressed as International Units of activity per mg protein in entire animal. Solid versus broken lines indicate separate spawnings. Error bars indicate 95% confidence interval about mean activity for each developmental stage. Sample size for each mean is indicated by numbers above or below bars. N. nauplius stage 5; Z. protozoeal stages 1-3; M, mysis stages t-3: PL. age of postlarvae in days. feeding stage. Enzyme activities increase during early lar- val development in all four species. In P. setijerus and P. japonicus, amylase activity decreases to a low level by metamorphosis, but activity remains relatively constant in P. serratus and H. americanus. In all species, amylase activity increases during postlarval development. Prote- ase activity in all four species decreases at metamorpho- sis. During early postlarval development, protease activ- ity remains low in Penaeus spp., but increases in P. serra- tus and H. americanus. There is a peak in A/P ratio for P. japonicus at Z3, but in P. setijerus the peak occurs at Mi; in both species the ratio declines to a low level at metamorphosis. Ontogeny of gut. Increase in digestive enzyme activity has been correlated with differentiation of the gut in lar- vae of both teleosts (Buddington and Doroshov, 1986) and echinoderms (Vacquier et a/., 1971). In P. setijerus, the decrease in most enzyme activities immediately after metamorphosis coincides with degeneration of the ante
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
