Effects of hook type on injury and capture efficiency of rock bass, Ambloplites rupestris
, angled in south-eastern Ontario

The reintroduction of River Otters (Lontra canadensis) between 1982 and 1992 resulted in widespread occurrence of the species throughout the Missouri Ozarks. This study examined otter diets from the vicinity of two Ozark streams in relation to seasonal and spatial trends. Otter scats (N = 4750) were collected and analyzed from the Osage Fork River and Big Piney River during the summer and winter seasons of 2001 and 2002. During the winter (January-March), fish occurred in 86% of the samples. During the summer (June–August), occurrence of fish dropped to approximately 15% for both rivers. Seven families of fish were identified in the diets, with Centrarchidae being most common regardless of river or season. Within the Centrarchidae, the genus Lepomis (mostly Longear Sunfish, Lepomis megalotis) was most common, with Micropterus (mostly Smallmouth Bass, Micropterus dolomieu) and Rock Bass (Ambloplites rupestris) also well represented. The mean age of Ambloplites consumed (mean = 3.3 years) was consistently older than that of either Micropterus (mean = 2.54 years) or Lepomis (mean = 2.78 years). Crayfish were recovered from a mean of 85.2% of scats in the winter and 99% in the summer. Smaller fish and crayfish were more common from the upper reaches of the streams while larger fish were prevalent in the lower reaches.

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Hydrostratigraphic model of the South Nation watershed region, south-eastern Ontario

10.4095/248203 ◽

2009 ◽

Cited By ~ 1

Author(s):

C Logan ◽

D I Cummings ◽

S Pullan ◽

A Pugin ◽

H A J Russell ◽

...

Keyword(s):

The South ◽

South Eastern ◽

Eastern Ontario

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Comparative growth and condition of northern stream-dwelling rock bass,Ambloplites rupestris (Rafinesque)

Hydrobiologia ◽

10.1007/bf00007135 ◽

1988 ◽

Vol 160 (3) ◽

pp. 199-206 ◽

Cited By ~ 5

Author(s):

Douglas B. Noltie

Keyword(s):

Rock Bass ◽

Ambloplites Rupestris ◽

Northern Stream

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Evaluation of the influence of groundwater on algal biomass and accrual at the reach scale in a shallow river (Raisin River, South Eastern Ontario, Canada)

SIL Proceedings 1922-2010 ◽

10.1080/03680770.2009.11902211 ◽

2009 ◽

Vol 30 (5) ◽

pp. 662-668

Author(s):

Lieserl M.E. Woods ◽

F.R. Pick ◽

M.J.L. Robin

Keyword(s):

Algal Biomass ◽

South Eastern ◽

Eastern Ontario ◽

Raisin River

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Sexual differences in accumulation of mercury in four species of centrarchid fishes

Canadian Journal of Zoology ◽

10.1139/z88-140 ◽

1988 ◽

Vol 66 (4) ◽

pp. 944-949 ◽

Cited By ~ 36

Author(s):

Paul F. Nicoletto ◽

Albert C. Hendricks

Keyword(s):

Lepomis Macrochirus ◽

Mercury Content ◽

Lepomis Gibbosus ◽

South Fork ◽

The South ◽

Male And Female ◽

Rock Bass ◽

Males And Females ◽

Redbreast Sunfish ◽

Ambloplites Rupestris

A 3-year study of fish from the South River, and the South Fork of the Shenandoah River, and the Shenandoah River in Virginia revealed significant differences in the muscle mercury content of males and females. Female rock bass, Ambloplites rupestris, redbreast sunfish, Lepomis auritus, pumpkinseed, Lepomis gibbosus, and bluegill, Lepomis macrochirus contained higher levels of mercury than the males of each species. An analysis of these species indicated that sex-related differences in mercury levels were not due to differences in body size but may have been related to the onset of reproduction. For example, mercury levels in 1-year-old male and female redbreast sunfish were not significantly different: females averaged 0.66 μg Hg/g and males averaged 0.63 μg Hg/g. However, at 2 years of age, when redbreast sunfish first reproduce, females contained significantly more mercury than males: females averaged 0.84 μg Hg/g and males averaged 0.60 μg Hg/g. Analysis of the other species yielded similar results.

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