Daniel R. Holder

A Comparison Of The Diets Of Redbreast Sunfish And Spotted Sucker In A Coastal Plain Stream

The diets of r,edbreast sunfish (Lepomis auritus) and spotted sucker (Minytrema melanops) in the Satilla River, Georgia, were shown to be quantitatively different using Spearman rank correlation coefficients. The index of overlap of Pianka by number and weight showed considerable overlap in the diet during the fall. Chironomids were the main food component contributing to this overlap. The index of electivity of Ivlev indicated moderate to high selectivity by both species for chironomids in the winter, spring, and summer and some selectivity in the fall. The diet overlap between the 2...

Year
1977

Life History of Warmouth in the Suwannee River and Okefenokee Swamp, Georgia

Life history data were collected from Suwannee River and Okefenokee Swamp warmouth (Lepomis gulosus) from 19 July 1968 through 28 June 1973. Suwannee River warmouth became sexually mature in the third year of life. while warmouth from the Okefenokee Swamp became sexually mature in the second year of life. Collection of fecund warmouth suggested that the nesting season extended from April to late July or early August and that peak spawning generally occurred in early May. Fecundity estimates varied from 3,029 to 22,850 ova per female and generally increased with fish length. The average...

Year
1974

Life History of the Redbreast Sunfish in the Satilla River, Georgia

Life history data were collected from redbreast sunfish. Lepomis Quritus (Linnaeus). in the Satilla River between 1 July 1970 and 30 June 1973, Spawning was observed in the Little Satilla River during May and June at water temperatures from 22.2°-24.4°C. Strong site preference was evident. Nests were associated with fallen trees, stumps. or logs. The average nest diameter was 93.5 em and the preferred substrate was sand. Sex ratio was I male to 1.49 females. Fecundity estimates ranged from 322 to 9206 ova per female around a mean of 3302 ova. Fecundity increased with both length and weight...

Year
1974

A Study Of Fish Movements From The Okefenokee Swamp Into The Suwannee River

The construction of a dike dividing the Okefenokee Swamp and the Suwannee River in 1960 and the phenomenal poundage of bowfin found in the river prompted an investigation to determine what fish were entering the river by passing over the dike from the swamp. Twenty thousand nine hundred and forty-six fish weighing 18,590.3 pounds were calculated to have moved over the spillway from February 20, 1969 to June 26, 1970. Bowfin comprised seventy-nine percent by weight of the fish and yellow bullhead were the most numerous species to come over. Ninety percent of the movement occurred at night....

Year
1970