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and a midday period of sampling inactivity was reserved for equipment <br />maintenance, travel, and personal activities of the crew (Figure 5). • <br />Daylight activities were devoted to netting, trapping, electrofishing and <br />physical/chemical measurements. Activities during darkness were devoted <br />to tending nets; traps, electrofishing, and some seining. Seasonal <br />sampling conformed to river stage. Each year (when work was in progress) <br />prerunoff, runoff, and postrunoff river stages were sampled in each of <br />the six strata. <br />Figure 5 <br />12 am <br />12 Pm <br />0 <br />y <br />00 Strata <br />. ,Sh <br />d <br />n j <br />Freeze f <br />UP <br />Post <br />Runoff m <br />Pre <br />Runoff <br />a <br />Runoff Annual <br />j m Strata <br />1 <br />Temporal sampling design <br />8 <br />•