scholarly journals Diet shifts and delayed piscivory specialisation during the ontogenesis of the largemouth bass Micropterus salmoides (Lacepede, 1802) in the Nakdong River and Upo Wetlands, South Korea

2016 ◽  
Vol 63 (4) ◽  
Author(s):  
Hyunbin Jo ◽  
Ju-Duk Yoon ◽  
Jeong-Hui Kim ◽  
Kwang-Seuk Jeong ◽  
Yuno Do ◽  
...  
Keyword(s):  
South Korea ◽  
Largemouth Bass ◽  
Prey Selection ◽  
Micropterus Salmoides ◽  
Habitat Type ◽  
Habitat Characteristics ◽  
Diet Shift ◽  
Ontogenetic Changes ◽  
Nakdong River ◽  
Prey Items

In this study, we examined the ontogenetic changes in prey selection pattern of largemouth bass Micropterus salmoides (Lacepede, 1802) in accordance with habitat type. The stomach contents of largemouth bass were analysed with respect to predator size classes for two different habitats (Nakdong River main channel and the Upo Wetlands tributary) in South Korea, that differed in the diversity of potential prey items. The diversity (H′) of invertebrate diet items in stomach of largemouth bass was found significantly different between the study sites. Small large mouth bass (<100 mm) preferred to consume decapods and mayflies in the river and wet land systems respectively. Fishes >100 mm in the river and >200 mm in the wet land system preferred fish as their prey. Results demonstrated variations in composition of prey items as influenced by habitat characteristics as well as habitat use type, contributed to the delayed ontogenetic diet shift in the largemouth bass population.

ONTOGENETIC CHANGES IN RESPONSE TO HETEROSPECIFIC ALARM CUES BY JUVENILE LARGEMOUTH BASS ARE PHENOTYPICALLY PLASTIC

Behaviour ◽  
2002 ◽  
Vol 139 (7) ◽  
pp. 913-927 ◽  
Author(s):  
Devon Gershaneck ◽  
Justin Golub ◽  
Grant Brown ◽  
Desiree Plata
Keyword(s):  
Largemouth Bass ◽  
Standard Length ◽  
Micropterus Salmoides ◽  
Alarm Cues ◽  
Ontogenetic Changes ◽  
Body Type ◽  
Chemical Alarm Cue ◽  
Alarm Cue ◽  
Information Cues ◽  
Chemical Alarm Cues

AbstractJuvenile largemouth bass (Micropterus salmoides) undergo an ontogenetic change in their response to chemical alarm cues of a heterospecific prey guild member (finescale dace, Phoxinus neogaeus), shifting from an antipredator to a foraging response at a standard length of 50 to 55 mm. We conducted a laboratory study to determine if: (1) this shift is fixed or phenotypically plastic, and (2) juvenile bass respond to the alarm cues of a non-Ostariophysan prey guild member. Juvenile bass were reared on high versus low food diets for 10 weeks prior to the experiment, and then exposed to heterospecific skin extracts (the source of chemical alarm cues). When exposed to the skin extracts of finescale dace or green sunfish (Lepomis cyanellus), juvenile bass exhibited a significant positive relationship between standard length and horizontal and vertical area use and time spent moving. In addition, there was a significant effect of body type, with bass with deeper body morphs shifting from antipredator to foraging responses earlier than those with shallower body morphs. Bass exhibited no change in behaviour to swordtail (Xiphophorus helleri) skin extracts, which lack a chemical alarm cue recognized by bass. These data strongly suggest that the developmental point at which bass switch from an antipredator to a foraging response is phenotypically plastic and dependant upon body morphology, and that bass are capable of using the chemical alarm cue of at least two, taxonomically diverse, heterospecific prey guild members as social information cues.

scholarly journals Recruitment dynamics of non-native largemouth bass within the Sacramento-San Joaquin Delta

2020 ◽  
Author(s):  
Brock M. Huntsman ◽  
Frederick Feyrer ◽  
Matthew J. Young ◽  
James A. Hobbs ◽  
Shawn Acuña ◽  
...  
Keyword(s):  
Population Structure ◽  
Largemouth Bass ◽  
Aquatic Vegetation ◽  
Micropterus Salmoides ◽  
Habitat Characteristics ◽  
Fish Community Structure ◽  
Health Indices ◽  
Young Of The Year ◽  
Overwinter Mortality ◽  
Critical Developmental Period

Largemouth bass (Micropterus salmoides, LMB) recruitment is limited by a critical developmental period during early life-stages, but this mechanism may be less significant within non-native habitats. We conducted boat electrofishing surveys in four tidal lakes of California’s Sacramento-San Joaquin Delta (SSJD) from 2010-2011 to describe introduced LMB recruitment dynamics. We evaluated growth, proximate composition, and health indices of young-of-the-year (YOY) LMB among tidal lakes and developed an integrated count model to determine how factors known to affect LMB recruitment shape SSJD population structure. Our results show a mismatch between growth, nutrition, and YOY abundance, where the tidal lake with the most abundant and fastest growing LMB had the poorest nutritional status. The warm winter water temperatures and lack of a hatching-cohort growth advantage suggests overwinter starvation plays a less significant role in SSJD LMB recruitment than many native LMB habitats. Collectively, our results suggest that habitat characteristics (submerged aquatic vegetation) and not overwinter mortality shapes SSJD LMB population structure, a mechanism consistent with contemporary hypotheses about the altered fish community structure of the SSJD.

Behavioral phenotype does not predict habitat occupancy or angling capture of largemouth bass (Micropterus salmoides)

2020 ◽  
Vol 98 (6) ◽  
pp. 399-409
Author(s):  
T.D. Keiling ◽  
M.J. Louison ◽  
C.D. Suski
Keyword(s):  
Largemouth Bass ◽  
Specific Activity ◽  
Micropterus Salmoides ◽  
Habitat Type ◽  
Foraging Strategies ◽  
Habitat Occupancy ◽  
Open Habitat ◽  
Behavior Types ◽  
The Impact ◽  
Predator Behavior

Fish behavior types can predict angling vulnerability, providing insights about how recreational fishing may lead to artificial trait selection. Most vulnerability studies have focused on species with active foraging strategies, and the impact of environmental conditions on vulnerability has not been quantified. The objective of this study was to determine the influences of behavior types and habitat on angling vulnerability of largemouth bass (Micropterus salmoides (Lacepède, 1802)) — a sit-and-wait predator. Behavior assays quantified individual activity and boldness, then experimental angling took place in ponds with two habitat treatments: (1) structured habitat with artificial structures present and (2) open habitat with no structures added. Two anglers determined which individual largemouth bass were vulnerable to capture across the two contexts. In contrast with previous studies involving active foragers, behavior types of largemouth bass did not influence capture, regardless of habitat type. The number of captures also did not differ between structured and open habitat. However, anglers captured fish with different behavioral phenotypes, revealing additional complexity for factors that may affect behavioral selection. Findings suggest that angling may not be selecting for specific activity or boldness phenotypes of largemouth bass, even across habitat types, but that anglers may influence selection.

Pathogeny of disease characterized by swollen liver and spleen in largemouth bass (Micropterus salmoides)

2013 ◽  
Vol 18 (3) ◽  
pp. 654-659 ◽  
Author(s):  
Dongmei MA ◽  
Guocheng DEND ◽  
Junjie BAI ◽  
Shengjie LI ◽  
Xiaoyan JIANG ◽  
...  
Keyword(s):  
Largemouth Bass ◽  
Micropterus Salmoides

scholarly journals Sedimentary Processes of Barrier-Lagoon System in the Nakdong River Estuary, Busan, South Korea

2018 ◽  
Vol 85 ◽  
pp. 1-5 ◽  
Author(s):  
Han Jun Woo ◽  
Jun-Ho Lee ◽  
Jeongwon Kang ◽  
Jae Ung Choi
Keyword(s):  
South Korea ◽  
River Estuary ◽  
Nakdong River ◽  
Sedimentary Processes ◽  
Lagoon System ◽  
The Nakdong River
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