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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />~- <br />1 <br />z <br /> <br />Page <br /> <br /> <br />Figure 24. Changes in Mid-gut intestinal cell height (upper) and Mid-gut grading criteria <br /> <br /> <br />(lower) for Starved, Suboptimal and Ad libitum razorback sucker larvae at 14, 17 <br /> <br /> <br />and 22 d underlaboratory conditions. ............................... 142 <br /> <br /> <br />Figure 25 a-c. Mid-gut histology of tissue classes used for developing grading criteria in <br /> <br /> <br />razorback sucker larvae: a. Grade 3, representing tissue in optimal condition; b. <br /> <br /> <br />Grade 2, shows some evidence of atrophy, cell height is somewhat reduced and <br /> <br />folding is reduced; c. Grade 1, in which a high degree of atrophy is visible with <br /> <br /> <br />noticeable separation of mucosal layer. ..... . . . . . . . . . . . . . . . . . . . . . . . . . . 143 <br /> <br /> <br />Figure 26. Changes in Brain (upper) and Muscle (lower) grading criteria in Starved, <br /> <br />Suboptimal and Ad libitum razorback sucker larvae at 14, 17 and 22 d under <br /> <br /> <br />laboratory conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 <br /> <br /> <br />Figure 27 a-c. Histology of brain tissue used for developing grading criteria in <br /> <br /> <br />razorback sucker larvae: a. Grade 3, distinguished primarily by active zones of <br /> <br /> <br />mitosis; b. Grade 2, mitosis noticeably reduced to non-existent, otherwise tissue <br /> <br />appears normal; c. Grade 1, mitosis is non-existent, lesion-like openings often <br /> <br /> <br /> <br />apparent. ...................................................... 146 <br /> <br />XXIV <br />