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Last modified
7/14/2009 5:02:33 PM
Creation date
5/17/2009 10:52:20 PM
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UCREFRP
UCREFRP Catalog Number
8192
Author
Wydoski, D.
Title
Review of Report Regarding Evaluation of Gravel-Pit Ponds.
USFW Year
1997.
USFW - Doc Type
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Copyright Material
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<br />probably originated from neighboring Hotspot Pond. <br /> <br />Runoff Sampling. Native fish used these two connected ponds mostly during <br />runoff. Native fish comprised 39t and 13t of the catch in Gardner and Hotspot <br />ponds, respectively (Figure 4). Of the 282 fish collected in Gardner Pond, the <br />most common fi shes co 11 ected were fl anne 1 mouth sucker (33tL green sunfi sh (24tL <br />and white sucker (21t). Of the 321 fish collected in Hotspot Pond, the most <br />common were white sucker (33t) , black bullhead (18t) , and bluegill (13%; Table <br />2). <br /> <br />Post-Runoff Sampling. During post-runoff sampling in July, two adult <br />Colorado squawfish were the only native fish caught in Gardner Pond which was 1t <br />of the 137 total fishes collected. These two fish were caught in the connection <br />channel between the pond and river. In Hotspot Pond, the only native fish caught <br />were two juvenile flannelmouth sucker that comprised 2t of the 99 fish collected <br />(Figure 4). The most common nonnative fishes captured in Gardner Pond were black <br />crappie (24t) , common carp (20t) , white sucker (21t), and black bullhead (15%). <br />In Hotspot Pond, the four most common caught fishes were black bullhead (28%), <br />white sucker (21%), largemouth bass (19t) , and common carp (18t; Table 3). <br /> <br />Gear Tvpe vs. Species Selectivity <br /> <br />Relative abundance was used to describe the species collected by each gear <br />type (Appendix C; Tables C.1.-C.3.). Of the 448 fish collected with <br />electrofishing from both ponds during the three periods sampled, the most common <br />fishes captured numerically in descending order were common carp (64%) , <br />largemouth bass and black bullhead (12% each) and green sunfish (4%). Of the <br />1,348 fish collected with trap nets, the most common species captured were black <br />bullhead (34t), white sucker (24t) , black crappie (12%), and flannelmouth sucker <br />(8.%). Of the 389 fish collected with trammel nets, the most common fishes <br />captured were white sucker (39.%), flannelmouth sucker (23t) , black bullhead <br />(20t) , and common carp (7t). <br /> <br />An attempt was made to determine if one gear type was more selective in <br />capturing certain fishes. Each of the three different gear types used to capture <br />sub-adult and adult fishes appeared to select for certain species. <br />Electrofishing selected for sub-adult and adult carp, largemouth bass, and black <br />bullhead (Table 4; Figure 5). Trap nets captured three times as many fish as <br />either electrofishing or trammel nets. Trap nets selected for black bullhead in <br />addition to white sucker, black crappie, bluegill, and green sunfish. Trammel <br />nets appeared to select more than electrofishing for black bullhead and white <br />sucker. Trap and trammel nets were similarly selective in capturing native <br />fishes such as flannelmouth sucker, bluehead sucker, roundtail chub, and Colorado <br />squawfish. <br /> <br />Fish Recaptures <br />One adult Colorado squawfish (PIT-tag no. 1F413A0066), initially captured <br />8 <br />
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