Keith W. Ashley

Size, Growth, and Condition of Flathead Catfish in Sutton Lake, North Carolina: Implications for Managing an Introduced Species in Thermally-Influenced Reservoirs

Fisheries Outstanding Technical Paper

Abstract.: A total of 747 flathead catfish (Pylodictis olivaris) were collected from Sutton Lake cooling reservoir located near Wilmington, North Carolina (1999 to 2006), using boat-mounted electrofishing techniques. Individuals >600 mm total length accounted for 70% of all fish collected and trophysized fish (>1,020 mm total length) accounted for 9% of all fish collected. Mean total length (TL) at age was described by the von Bertalanffy growth curve as TL = 1,200 (1-e-0.17[age + 0.93]). Sutton Lake flathead catfish total annual mortality (A) was 0.32. The well-established flathead...


Comparison of 3 Electrofishing Gear Types Used to Capture Catfish

We compared catfish catch per unit effort (CPUE), species composition, and size distribution data collected by a Smith-Root 7.5 GPP boat-mounted electrofishing unit, a Smith-Root 7.5 GPP boat-mounted electrofishing unit used in conjunction with the Smith-Root “Catfish Zapper,” and with the micro-electronic device known as the “Skoal Box.” A combined 1,175 catfish were collected from 6 sites within the Cape Fear and Lumber rivers in the summers of 2000 and 2001. The Smith-Root 7.5 GPP (GPP) collected 549 catfish (46.7%) during the 2-year period while the Smith-Root 7.5 GPP used with the...


Food Habits of Bowfin in the Black and Lumber Rivers, North Carolina

We examined food habits of bowfin (Amia calva), in the Black and Lumber rivers, North Carolina. Stomachs from 192 Black River bowfin and 175 Lumber River bowfin were analyzed to determine frequency of occurrence and percent by number and weight of individual food items consumed from 1994 to 1997. Crustaceans [primarily crayfish (Astacidae) and grass shrimp (Palaemonidae)] were the dominant food item consumed by bowfin in both rivers. They occurred, on average, in 79% of Black River bowfin stomachs containing food and accounted for 65% by number and 53% by weight of all food items consumed...


Changes in Redbreast Sunfish Population Characteristics in the Black and Lumber Rivers, North Carolina

The objective of this study was to document changes in catch rates (fish/hour) and size structure of the redbreast sunfish (Lepomis auritus) populations in the Black and Lumber rivers, North Carolina, over a 4-year period following implementation of a 12-fish daily creel limit. Using boat-mounted electrofishing gear, 123, 122, 94, and 59 redbreast sunfish were collected from the Black River from 1994 through 1997. Numbers of redbreast sunfish collected from the Lumber River during the same years were 257, 252, 164, and 183. Mean CPUE for Black River redbreast sunfish was 18, 19, 16, and 7...


Assessment of the North Carolina Wildlife Resources Commission Environmental Permit Review Program

The North Carolina Wildlife Resources Commission (NCWRC) Environmental Permit Review Program was evaluated. The objective was to classify and compare a sample of environmental permit reviews conducted in 1989 with permit disposition. A secondary objective was to assess the degree of incorporation of conditions attached to permits recommended by NCWRC personnel for approval with modification. One hundred and ten permit applications were reviewed. State and federal regulatory agencies, with few exceptions, denied fewer permit applications than were recommended for denial by the NCWRC. Survey...


Food Habits of Flathead Catfish in the Cape Fear River, North Carolina

Food habits of flathead catfish (Pylodictis olivaris) in the Cape Fear River were determined through analysis of 184 stomachs collected during the spring and summer of 1986. Fish were collected with a 5-bar, hand-cranked telephone generator (magneto). The objective was to determine if frequency of occurrence and percent by numbers of individual food items in the diet of flathead catfish changed significantly between 1979 and 1986. Current data indicate ictalurids, clupeids, and centrarchids remain the primary food items in the diet of Cape Fear River flathead catfish; however, a shift from...