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4 s <br />0 <br />22 July. During and subsequent to these dates, all specimens were <br />carefully examined for evidence of marks. <br />Beginning on 29 July, captured fish were removed to another on-site <br />location (Davis Cove) for an additional period of growth. This <br />decision was prompted by a combination of declining water level in <br />the backwater (which was a direct response to lower elevation of <br />Lake Mohave, with which it is hydrologically connected through the <br />coarse gravels of the separating berm), stressful and potentially <br />lethal water quality conditions (especially dissolved oxygen, which <br />in deeper areas was below 1 mg/L; and temperature, which in places <br />approached 30 C; see below), and extensive, dense growths of sago <br />pond-weed (Potamogeton pectinatus) and spiny naiad (Nalas marina). <br />On 14 October and 23-25 November, most fish exceeded the target <br />length of 30 cm, and thus were PIT (Passive Integrated Transponder) <br />tagged and released to Lake Mohave. On the morning of 25 November, <br />the backwater was again treated with ichthyocide to ensure complete <br />removal of all fish, and to reset the system for propagation. in <br />1993. Fish captured during the poisoning were transferred <br />immediately to fresh lake water to recover from effects of the <br />toxicant (rotenone) and, once stabilized, were released into the <br />lake. The backwater was inspected five days after the reclamation <br />operation, when two moribund individuals were recovered.