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Life history pattern of notropis sabinae pisces cyprinidae in the lower sabine river drainage of louisiana and texas usa



Life history pattern of notropis sabinae pisces cyprinidae in the lower sabine river drainage of louisiana and texas usa



Tulane Studies in Zoology & Botany 22(2): 67-84



The life history of N. sabinae in 2 tributary streams of the lower Sabine River drainage system (Bayou Anacoco, Beauregard-Vernon Paris line, Louisana; Big Cow Creek, Newton County, Texas) was studied from 1972-1977. The life history pattern observed for the 2 streams was similar. In Bayou Anacoco, the reproductive season extended from early April through late Sept. It was similar in Big Cow Creek except that reproduction ended earlier in Sept. 1973. Counts of unovulated mature ova in females ranged from 113-423 for females 35-48 mm SL [standard length] and were significantly correlated with female size. There was a low but significant correlation between the ovary weight-somatic weight ratio and body size among Bayou Anacoco females but not among Big Cow Creek females. A low but significant correlation was found between mean mature ovum size and body size among females from both localities. The size of unovulated mature ova ranged from 0.55-0.88 mm diameter. There were no significant differences in slope or elevation of regression lines fitted to either fecundity or ova size data for each of the 2 lcoalities. Sex ratios did not differ significantly from 1:1. Females matured at a slightly larger size than males; all females were mature by 32 mm in Bayou Anacoco and 33 mm in Big Cow Creek. Mean sizes of adult males and females did not differ significantly. Maximum age for most individuals of N. sabinae was about 1 1/2-2 yr. Maximum size was 49 and 47 mm SL for Big Cow Creek and Bayou Anacoco, respectively.

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