8002 - Laserfiche WebLink

Home Browse Search

25 by Minckley (1983) from Lake Mohave in 1982 and are higher than those reported from the upper basin by McAda and Wydoski (1980). Males averaged 554.4 mm (TL) in 1982 and 555.7 mm (TL) in 1983. Total lengths of females were significantly higher than males (Mann-Whitney U-test; p=.001) and averaged 628.2 mm in 1982 and 624.0 mm in 1983. Males ranged from 448-686 mm (TL) in 1982 and 450-610 mm (TL) in 1983 (Table 2). The 686 mm (TL) male caught in 1982 may have been incorrectly recorded as a female in the field. The average weight of males captured was 2037.2 gm in 1982 and 2024.6 gm 1983. Females averaged 3123.2 gm in 1982 and 3023.7 gm in 1983 (Table 2). The lengths and weights of bonytail chubs captured during the study are presented in Table 3. The males ranged from 508-529 mm (TL) and females from 475-535 mm (TL). The weights of male bonytail chubs ranged from 809-1105 gm and in females from 766-1040 gm. The length frequency distribution for female razorbacks in the 1982-83 combined catch was slightly leptokurtotic and skewed toward the smaller size classes (Fig. 6). There was an abrupt decrease in the frequency curve for females between 640 and 650 mm, and a sharp decrease at 670 mm. The length frequency distribution for males was more symmetric (Fig. 6). There was however, a slight decrease in the frequency curve between 540 and 550 mm. The range of lengths (TL) for males was 200 mm and 180 mm for females. There were some differences in the monthly mean lengths of male and female razorbacks in the spawning areas. Individuals present during January were slightly larger than those present in following months (Fig. 7-8). Total lengths of males were statistically different during the first three months of the 1982 spawning season (Kruskal-Wallis;