. Bulletin. Natural history; Natural history. Aug. 1981 Tranquilli et al. : Fishery Population Dynamics 415 lake consists of three long narrow arms oriented in a north-south direction and converging at the northern end where the dam is located (Fig. 1). The power plant is located at the southern end of the lake between the western and middle arms. The plant draws water from the west (intake) arm and empties it into the middle (discharge) arm. A thermal gradient is thus created as the heated water flows around a 16-km cooling loop. The east (control) arm is connected to, but not directly involv
. Bulletin. Natural history; Natural history. Aug. 1981 Tranquilli et al. : Fishery Population Dynamics 415 lake consists of three long narrow arms oriented in a north-south direction and converging at the northern end where the dam is located (Fig. 1). The power plant is located at the southern end of the lake between the western and middle arms. The plant draws water from the west (intake) arm and empties it into the middle (discharge) arm. A thermal gradient is thus created as the heated water flows around a 16-km cooling loop. The east (control) arm is connected to, but not directly involved in, the cooling loop and thus serves as a control area. This rather unique morphology made Lake Sangchris an ideal site for the study of thermal effects on aquatic organisms. Fish sampling stations at Lake Sangchris were selected to represent different thermal habitats (Fig. 1). Station 7, in the control arm, and stations 1 and 2, in the intake arm, represented sampling areas with near-ambient water temperatures. The habitat at stations 2 and 7 is typical of the lake, with numerous coves and inlets. Station 1, the intake canal, is a steep-sided channel in length. Although the surface waters do not flow into the intake canal, there is a current near the bottom created by circulating water pumps, which withdraw water from a depth of 6 m below a skimmer wall. Stations 3, 4, and 5, in the discharge arm, represented artifically heated habitats. The discharge canal, Station 5, had the highest temperature of all stations in the cooling loop. The discharge canal is a channel with a very obvious current. Station 4, located between the power plant and the dam, is a typical lake station characterized by numerous coves, yet it was highly influenced by the thermal effluent. The dam area (Station 3), approximately halfway around the cooling loop, is another habitat STATION 3. STATION 7 PLANT Fig. 1.—Fish sampling stations in Lake Please note that these images
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