. Bulletin. Natural history; Natural history. Aug. 1981 PoRAK & Tranquilli: Impingement and Entrainment of Fishes 647 literature by Fish (1932), Mansueti & Hardy (1967), May & Gasaway (1967), Meyer (1970), and Hogue et al. (1976). Ichthyoplankton data were standardized into catch per unit effort and expressed as number of fish eggs (or larvae) per 10 m' of water. Velocity profiles and water parameters were measured through the stop-log grates in front of the traveling screens. Pump data were obtained from power plant personnel. RESULTS AND DISCUSSION A total of 218 fish eggs was co
. Bulletin. Natural history; Natural history. Aug. 1981 PoRAK & Tranquilli: Impingement and Entrainment of Fishes 647 literature by Fish (1932), Mansueti & Hardy (1967), May & Gasaway (1967), Meyer (1970), and Hogue et al. (1976). Ichthyoplankton data were standardized into catch per unit effort and expressed as number of fish eggs (or larvae) per 10 m' of water. Velocity profiles and water parameters were measured through the stop-log grates in front of the traveling screens. Pump data were obtained from power plant personnel. RESULTS AND DISCUSSION A total of 218 fish eggs was collected dur- ing the study period. Most of the eggs ( percent) were collected from 31 May through 12 August (Fig. 5). The greatest number of fish eggs found in 1 day was collected on 1 July at a density of fish eggs/10 m'. Fish eggs were collected in very low numbers at depths of 8 m and m during the study period. A t test indicated no significant differences (P< ) be- tween the numbers of fish eggs collected at the two depths. To estimate the total number of fish eggs entrained by the Kincaid Generating Sta- tion, the mean density of eggs was multiplied by the total flow of water through the plant during the major period of egg entrainment from 31 May through 12 August. An estimated million eggs were entrained during the 1976 spawning season. Since so few eggs were collected, a rigorous evaluation of the impact of fish-egg entrainment was not made. However, the estimate of million entrained eggs appears minimal when considering the prolific nature of most fish species. For example, data cited by Carlander (1969) showed fecundities for age II gizzard shad ranging from 211,378 to 543,912 eggs per female. Low fish-egg entrainment rates might have been expected, because all species of fish in Lake Sangchris, with the exception of freshwater drum, have demersal or semibouyant adhesive eggs. 0,4- oo S S UJ ca TOTAL NUMBER OF EG
Size: 1559px × 1603px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
