Stream drift feeding and microhabitat competition of invasive smallmouth bass Micropterus dolomieu, native Japanese dace Tribolodon hakonensis and pale chub Opsariichthys platypus in the Nogu River, Japan

In lake trout ( Salvelinus namaycush ) lakes of northeastern Ontario, Canada, aerial surveys of fishing activity on individual lakes (N = 589) and quantitative gillnet surveys (N = 65) were used to assess the effects of road access on angling effort and the presence of introduced smallmouth bass ( Micropterus dolomieu ). Angling effort, particularly during the open-water season, was highest and often exceeded estimated sustainable levels on lakes with good road access. Approximately 25% of the remote lakes also received excessive pressure during the winter season. Angler numerical responses to lake trout abundance were detected in remote lakes, but not in road-accessible lakes. Smallmouth bass were more prevalent in lakes with road access and human settlement (either cottages or lodges), supporting the theory that they were introduced into these lakes. Lake trout populations were depleted throughout much of the study range. Even without road access or smallmouth bass, lake trout abundance was still 47% lower than in unexploited reference lakes. When bass and (or) road access were present, lake trout abundance decreased by 77%. Remote lake trout populations in this area are clearly vulnerable to the negative impacts of improved access, a vector for both overexploitation and species introductions.

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Predation by Age-0 Smallmouth Bass (Micropterus dolomieu) on Bigscale Logperch (Percina macrolepida) in the Pecos River, New Mexico

The Southwestern Naturalist ◽

10.1894/gg-40.1 ◽

2010 ◽

Vol 55 (1) ◽

pp. 120-122 ◽

Cited By ~ 1

Author(s):

Thomas P. Archdeacon ◽

Stephen R. Davenport

Keyword(s):

New Mexico ◽

Smallmouth Bass ◽

Micropterus Dolomieu ◽

Pecos River

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River Otter, Lontra canadensis, Food Habits in the Missouri Ozarks

The Canadian Field-Naturalist ◽

10.22621/cfn.v122i4.636 ◽

2008 ◽

Vol 122 (4) ◽

pp. 303 ◽

Cited By ~ 11

Author(s):

Nathan M. Roberts ◽

Charles F. Rabeni ◽

John S. Stanovick ◽

David A. Hamilton

Keyword(s):

Smallmouth Bass ◽

Lontra Canadensis ◽

Micropterus Dolomieu ◽

Widespread Occurrence ◽

River Otters ◽

Lepomis Megalotis ◽

Rock Bass ◽

Longear Sunfish ◽

The Mean ◽

Ambloplites Rupestris

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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Ⅲ-1. Bioaccumulation and elimination of radiocaesium in Japanese dace Tribolodon hakonensis

NIPPON SUISAN GAKKAISHI ◽

10.2331/suisan.wa2446-10 ◽

2017 ◽

Vol 83 (5) ◽

pp. 811-811

Author(s):

WATARU TERAMOTO ◽

KOJI NIIZEKI ◽

KEIICHI SASAKI ◽

NAOHIKO INATOMI ◽

HIROTAKA NOMURA ◽

...

Keyword(s):

Tribolodon Hakonensis ◽

Japanese Dace

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Black Bass Diversity: Multidisciplinary Science for Conservation

Black Bass Diversity: Multidisciplinary Science for Conservation ◽

10.47886/9781934874400.ch24 ◽

2015 ◽

Keyword(s):

Population Dynamics ◽

Management Strategies ◽

Smallmouth Bass ◽

Micropterus Dolomieu ◽

Spawning Period ◽

Sampling Gear ◽

Gray Literature ◽

Black Bass ◽

Effective Conservation ◽

Conservation And Management

Abstract.—We reviewed the published and gray literature associated with Neosho Smallmouth Bass Micropterus dolomieu velox and the genetically distinct Ouachita lineage. Substantial interstream variation appears to occur among these populations, particularly related to age. The Neosho subspecies is more abundant, grows faster, and lives longer than the genetically distinct Ouachita lineage. Recruitment is highly variable among streams for both populations and appears to be related to some undescribed aspects of hydrology but also likely reflect bias due to sampling gear. Information on annual and seasonal trends is lacking for the Neosho subspecies and the Ouachita lineages, particularly as related to the spawning period. Conservation efforts for these lineages might benefit from agencies partnering to achieve goals that extend beyond a particular agency’s responsibilities and state boundaries. Recognition of spatial and temporal considerations, combined with a better understanding of the population dynamics as related to abundance, growth, mortality and reproduction, would benefit the creation of more effective conservation and management strategies for genetically distinct populations of Smallmouth Bass M. dolomieu.

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