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您的检索式：作者名="Jacob L.Davis"
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| 1 | An evaluation of a catch and release trout regulation in Rapid Creek,South Dakota显示文摘Often,catch and release regulations are meant to maximize a fisheries potential to create trophy fish.I evaluated adult Brown Trout populations at five locations within Rapid Creek within Rapid City,SD over a two-year period.In each year,one of these locations was within a catch and release area,while two were outside.In 2012,density and biomass estimates were higher in a site located outside of the catch and release area.Additionally,size structure within the catch and release area was only significantly larger than one of the two sites outside of the regulation area.Mean relative weight values were inversely related to density estimates,with the lowest density sites having the highest mean relative weights.Similarly,a site outside of the catch and release area had the highest abundance and biomass estimates in 2013.The cumulative length distribution was significantly different between the site within the catch and release area and the two located outside.Relative weight was significantly higher in the catch and release area than the two sites outside.As population characteristics within the catch and release area were not consistently better than outside,it is more likely that factors such as habitat and density dependence are impacting the Brown Trout population more than the regulation itself. | Jacob L.Davis | 2023 | Aquaculture and Fisheries2023，8，5： | 0 |
| 2 | Retention of fin clips and fin and operculum punch marks in rainbow trout显示文摘Fin clips(complete fin removal)or punch marks(stamping of a hole)in fins or operculum are quick and inexpensive methods to identify individuals or groups of fish.This study evaluated the retention of 6 mm diameter punch marks on the operculum,caudal(upper and lower lobes),dorsal,pelvic,and anal fins,and fin clips on adipose,pectoral,pelvic,dorsal and anal fins of rainbow trout Oncorhynchus mykiss for 279 days.Growth and survival were not significantly different among fish with the different mark types or locations.At the end of the experiment,100%of adipose clips,97%of pectoral and anal fin clips,and 93%of dorsal clips and pelvic fin clips were retained.Retention of punch marks was 57%and 50%for the lower and upper caudal fin lobe locations respectively,23%for the dorsal fin,and 3%for the operculum.No pelvic or anal fin punch marks were identified at the end of the trial.Significant differences in retention among the treatment groups did not occur until 125 days post marking,after which all fin clip treatments had significantly greater retention than pelvic and dorsal punch marks.Beyond 244 days,fin clips outperformed all punch mark locations. | Alex J.Rosburg Jacob L.Davis Michael E.Barnes | 2022 | Aquaculture and Fisheries2022，7，6： | 0 |
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