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8 I I I I I I I I I I I I I I I I I I I 3.3.3 1989 Year Class Total numbers and CPE of the 1989 year class showed a decrease over the winter. From fall 1989 to spring 1990, total numbers decreased by 88% from 120 to 14. CPE decreased by 78% from 2.07 to 0.42/100 m2. Fish captured in fall 1989 averaged 40 mm TL and ranged from 24 to 67 mm TL. Age-O Colorado squawfish captured in spring 1990 averaged 41 mm TL with a range of 29-54 mm TL. Average overwinter growth of the 1989 year class was 1 mm. Seven juveniles were captured in fall 1989 and one was captured in spring 1990. These fish ranged in length from 70 to 124 mm TL in fall, and the one fish in spring was 77 mm TL. These juveniles were considered to belong to 1988 year class. 3.3.4 1990 Year Class Total numbers and CPE of the 1990 year class decreased from fall to spring in the lower 50 miles of Reach 1. From fall 1990 to spring 1991, total numbers decreased by 83% from 111 to 19, and CPE decreased by 78% from 2.86 to 0.63/100 m2. Fish captured in fall 1990 averaged 44 mm TL and ranged from 27 to 60 mm TL. Age-O Colorado squawfish captured in spring 1991 averaged 46 inm TL with a range of 32 to 62 mm TL. Average overwinter growth of the 1990 year class was 2 mm. Thirteen juvenile Colorado squawfish, ranging from 63 to 154 nun TL, were captured in fall 1990. One juvenile Colorado squawfish, 70 mm TL, was captured in spring 1991. 3.3.5 1991 Year Class A total of 83 age-O Colorado squawfish were captured in the lower 50 miles of Reach 1 in fall 1991. Total numbers decreased by 46% to 45 by the following spring. Catch rates decreased by 37% from 2.30/100 m2 in fall to 1.44/100 m2 in spring. Fish captured in fall 1991 averaged 44 mm TL and ranged from 27 to 60 mm TL. Age-O squawfish captured in spring 1992 averaged 42 mm TL with a range of 25 to 64 mm TL. No overwinter growth was obselVed. No juvenile Colorado squawfish were captured in fall or spring sampling.