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each subsequent recapture. Fields were examined for obvious errors and corrected <br />when possible using original data sources, otherwise erroneous or irreconcilable data <br />were removed from analyses. Fish that died at capture or were moved to a hatchery <br />were excluded from analyses. <br />Three tag types were used to mark endangered fishes in the Upper Colorado <br />River Basin and all types were included in the analyses. Between 1975 and 1978, <br />endangered fish were tagged with Floy spaghetti tags and from 1978 to 1989, fish were <br />tagged with Carlin dangler tags attached by monofilament through the dorsal <br />musculature under the dorsal fin. Due to concerns with tag loss and infection. Carlin <br />tags were discontinued in 1989 and few fish were tagged between 1989 and 1990 <br />(Bates et al. 1993; Burdick and Hamman 1993). After 1990, fish were tagged with PIT <br />(Passive Integrated Transponder) tags injected into the body cavity with a hypodermic <br />needle. <br />All analyses were based on a comparison of fish initially captured by either <br />electrofishing or non-electrofishing gear types. Electrofishing gear consisted primarily <br />of boat-mounted, Coffelt WP-15 or Smith-Root CPS electrofishers that produced <br />pulsed-DC currents. Non-electrofishing gears were pooled and included trammel, gill, <br />hoop, trap, and fyke nets and angling. Captures from seines, block and shock, <br />undocumented, or unknown gear types were not included in the analysis. The capture <br />technique known as "block and shock" used both net and electrofishing gears <br />concurrently and was excluded because it was not possible to distinguish which gear <br />3 <br />