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Excerpt from Tulane Studies in Zoology and Botany, Vol. 27: June 11, 1989
Traps were set in a wide variety of microhabitats between 1500 hours and 1900 hours and recovered early the fol lowing morning. Depending upon logis tics, between 30 and 60 traps were set per night (normally 15-20 traps per site). In most instances, traps were spread over a 300-500 In stretch of stream and left undisturbed for 12 to 18 hours. Successful settings ranged in depth from 25 cm to 450 cm and in cluded areas of extremely fast current to pools with virtually no detectable current. Most traps, however, were set at depths ranging from 45 cm to 150 cm in areas with slow to moderate current. We Observed that traps placed with one of the long sides flush to the bank, a large boulder, a crevice in the bedrock or a submerged log were, on the aver age, more effective.
A variety of baits were tested early in the study to determine if one bait type was more effective than Others. Chicken parts, chicken livers, various types of canned cat food, canned sar dines, canned herring, and native mol luscs (snails and mussels ground or sliced and placed in a porous bait pouch) were compared. Canned her ring and native molluscs appeared to be the least effective attractants. Because there were no observable differences in trap-capture rates between the other types of baits, canned sardines were used predominantly during the major ity of the study because of convenience, cost and relative effectiveness.
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