Graduate Thesis Or Dissertation

 

The black crappie, Pomoxis nigromaculatus, as a farm pond fish in Oregon Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/00000264z

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  • The black crappie was evaluated as a pond fish in four experimental ponds in the Willamette Valley. Two ponds were stocked with largemouth bass, bluegill sunfish, and black crappie (1:9:3), and two ponds with largemouth bass and black crappie (1:3). Total biomass was greatest in the three-species ponds (80 kg/ acre), but was predominantly bluegill weight (70 percent). The average biomass in the two-species ponds was 63 kg /acre; black crappie and largemouth bass each comprising 50 percent. The average coefficient of condition for the largemouth bass was about 2.20 in all ponds. The average coefficient of condition for the black crappie was higher in the two- species ponds; 3.79 in contrast to 3.44 in the three-species ponds. A controlled fishing experiment showed that the black crappie was more susceptible to angling in the two-species ponds. Seventeen crappie were taken from the three-species ponds in contrast to 89 from the two-species ponds. Largemouth bass were caught about equally from all ponds; 66 from the two-species ponds and 76 irons the three-species ponds. Natural bait proved to be more effective for the black crappie and the bluegill sunfish than for the bass. Artificial bait was preferred by the bass. Both combinations of fishes appeared to be successful, but the crappies were heavier and the fish were of a more desirable size in the two-species combination. Data for growth of the black crappie were obtained from eastern Oregon reservoirs and additional western Oregon farm ponds. These data showed that reservoir crappie grew more rapidly in their first three years than did western Oregon crappie. The reservoir crappie were also in better condition than the farm pond crappie. Of the crappie examined, none were older than six years.
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