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I I I I I I I I I I I I I I I I I I I ~ 'I. _. Page Figure 28 a-c. Histology of muscle tissue used in development of histological grading criteria in razorback sucker larvae: a. Grade 3, distinguished by closely packed parallel muscle fibers; b. Grade 2, noticeable increase in interfibril space with fibers appearing wavy in nature; c. Grade 1, almost complete lack of structure fibers forming wavy, net-like pattern with myomere banding the only evidence of fonner structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Figure 29. Changes in Pancreatic (upper) and Liver grading criteria in Starved, Suboptimal and Ad libitum razorback sucker larvae at 14, 17 and 22 d under laboratory conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Figure 30 a-c. Histology of liver tissue used to develop histological grading criteria in razorback sucker larvae: a. Grade 3, identifiable by large intracellular spaces and widely dispersed nuclei; b. Grade 2, organ is somewhat atrophied, intracellular spacing reduced, and nuclei more condensed; c. Grade 1, entire organ is highly atrophied, no vacuolar like structures visible and nuclei are condensed and tightly packed. ...................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 Figure 31 a-c. Histology of pancreatic tissue used to develop grading criteria in razorback sucker larvae: a. Grade 3, well developed acinar arrangement, channels large and open; b. Grade 2, noticeable atrophy of organ; acinar arrangement still present, channels much constricted; c. Grade 1, high degree of atrophy of entire .organ; acinar structure almost non-existent and in extreme cases organ only recognizable because of staining color. ............................... 153 xxv