Size and species selection of zooplankton by larval and juvenile walleye (Stizostedion vitreum vitreum) in Oneida Lake, New York

1992 ◽  
Vol 70 (10) ◽  
pp. 2059-2067 ◽  
Author(s):  
Donna M. Graham ◽  
W. Gary Sprules
Keyword(s):  
New York ◽  
Feeding Strategy ◽  
Stomach Contents ◽  
Species Selection ◽  
Feeding Strategies ◽  
Stizostedion Vitreum ◽  
Calanoid Copepods ◽  
Oneida Lake ◽  
Total Length ◽  
Young Of The Year

Young-of-the-year walleye (Stizostedion vitreum vitreum) ranging from 7 to 38 mm in total length were collected from Oneida Lake, New York, from 14 May to 11 June, 1989. Stomach contents were analyzed to document feeding strategies employed during their early life stages. A distinct change in both type and size of prey was evident as the walleye progressed through their first 4 weeks of life. The diet of 10- to 13-mm walleye consisted of 77.3% (by number) cyclopoid copepods; walleye 13–19 mm in total length consumed calanoid copepods (96.1%), while the diet of older juveniles, 29–38 mm in total length, consisted of mostly cladocerans (Daphnia spp.) (88.3%). The smallest size class of fish consumed zooplankton 0.50–1.50 mm long, the second class of fish consumed 1.25- to 2.00-mm zooplankton, and the third class consumed 1.5- to 2.00-mm zooplankton. Electivity calculations from both field and laboratory studies revealed that these changes were a result of active selection by the young walleye. The smallest walleye consumed zooplankton as large as their mouth gapes would allow. As the larvae increased in size they began to consume zooplankton of intermediate size (mouth gape approximately 2.0 mm) and remained consistent in their choice thereafter. We suggest that young-of-the-year walleye foraged in a manner that optimized growth. Both species and size of zooplankton were important components of their feeding strategy.

Year-Class Formation in the Walleye (Stizostedion vitreum vitreum) Population of Oneida Lake, New York, 1966–73

1976 ◽  
Vol 33 (4) ◽  
pp. 783-792 ◽  
Author(s):  
J. L. Forney
Keyword(s):  
New York ◽  
Class Size ◽  
Class Formation ◽  
Stizostedion Vitreum ◽  
Oneida Lake ◽  
Pelagic Larvae ◽  
Second Year ◽  
Alternate Prey

Abundance of eight successive year-classes of walleyes (Stizostedion vitreum vitreum) was measured at intervals from hatching into the second year. Each year-class arose from an initial stock of 12–18 billion eggs. Population of pelagic larvae was augmented in some years by the release of hatchery-reared larvae but the effect on year-class size was obscured by mortality after young became demersal. Decrease in number of fingerlings was attributed to predation by older walleyes. Intensity of predation was influenced by abundance of alternate prey and duration of cannibalism by growth of young walleyes. Five year-classes that were monitored through age 4 contributed 12,000–478,000 walleyes to the adult stock.

scholarly journals Resource use by two electric fishes (Gymnotiformes) of the National Forest Saracá-Taquera, Oriximiná, Pará

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
Bruno E. Soares ◽  
Daniela C. O. Rosa ◽  
Nathália C. S. Silva ◽  
Miriam P. Albrecht ◽  
Érica P. Caramaschi
Keyword(s):  
Resource Use ◽  
Niche Breadth ◽  
Feeding Strategy ◽  
Stomach Contents ◽  
Niche Overlap ◽  
Feeding Strategies ◽  
National Forest ◽  
Microhabitat Use ◽  
Use Patterns ◽  
Head Morphology

ABSTRACT Fishes of the order Gymnotiformes have high diversity of oral and head morphology, which suggests trophic specializations within each clade. The aim of this study was to describe resource use patterns by two fish species (Gymnorhamphichthys rondoni and Gymnotus coropinae) in the National Forest Saracá-Taquera, Oriximiná - Pará, analyzing microhabitat use, diet composition, feeding strategies, niche breadth and niche overlap. Stomach contents of 101 individuals (41 G. rondoni and 60 G. coropinae), sampled in 23 headwater streams were analyzed and volume of food items was quantified to characterize their feeding ecology. Gymnorhamphichthys rondoni was captured mainly on sandy bottoms, whereas G. coropinae in crevices. Both species had a zoobenthivorous diet and consumed predominantly Sediment/Detritus and Diptera larvae, but also included allochthonous prey in their diet. These species had high niche overlap, with small variations related to the higher consumption of Ceratopogonidae larvae by G. rondoni and of Chironomidae larvae by G. coropinae. Both species had a generalist feeding strategy, but G. coropinae had a broader niche breadth. Our results demonstrate that G. rondoni and G. coropinae occupy different microhabitats but rely on similar food resources.

Evidence of Inter- and IntraSpecific Competition as Factors Regulating Walleye (Stizostedion vitreum vitreum) Biomass in Oneida Lake, New York

1977 ◽  
Vol 34 (10) ◽  
pp. 1812-1820 ◽  
Author(s):  
John L. Forney
Keyword(s):  
New York ◽  
Intraspecific Competition ◽  
Yellow Perch ◽  
Stizostedion Vitreum ◽  
Predator Population ◽  
American Eel ◽  
Oneida Lake ◽  
Sequence Of Events ◽  
Mean Size ◽  
Change In Mean

The sequence of events that led to a decline in numbers of American eel (Anguilla rostrata) and esocids and an increase in numbers of walleye (Stizostedion vitreum vitreum) in Oneida Lake from 1900–74 are reviewed. Demise of eel and esocids was followed by a rise in numbers of walleye, but little change in mean size of individual walleye. Reduced interspecific competition apparently enhanced walleye recruitment, but the anticipated increase in growth of walleye was probably inhibited by intensified intraspecific competition. This interpretation was supported by evidence that recruitment and growth of walleye in 1957–74 were regulated by prey abundance. Transition from a diverse predator population to one dominated by walleye was orderly and yellow perch (Perca flavescens) remained the most abundant prey. Key words: Percidae, competition, walleye biomass, Stizostedion, population dynamics, community ecology

scholarly journals Makanan dan strategi pola makan ikan kuniran Upeneus sulphureus, Cuvier (1829) di perairan Teluk Kendari, Sulawesi Tenggara

2018 ◽  
Vol 18 (1) ◽  
pp. 23
Author(s):  
Asriyana Asriyana ◽  
Nur Irawati
Keyword(s):  
Digestive System ◽  
Feeding Strategy ◽  
Mesh Size ◽  
Medium Size ◽  
Feeding Strategies ◽  
Productive Capacity ◽  
Total Length ◽  
Large Size ◽  
Management Plans ◽  
Food And Feeding

Knowledge of food and feeding strategies are essential to understand the ecological role and productive capacity of fish populations. This information is critical for development of conservation and management plans of fishery resources. This study aimed to analyze the food and feeding strategy of sunrise goatfish in Kendari bay. Sampling was done monthly from May to November 2016, with bottom experimental gillnets with mesh size ¾, 1, 1 ¼, and 1 ½ inches. The food habits was analyzed using index of preponderance; while feeding strategy was determined by Amundsen modified Costello method. There were 386 fish with total length and weight ranged from 46.0-176.0 mm and 3.0-67.1 g, res-pectively. The fish were categorized into 3 groups based on the length sizes. The length sizes were classified into small size (45.0-69.7 mm), medium size (69.8-94.3 mm) and large size (94.4-119.0 mm). Twenty eight species of organisms were found in the digestive system of the sunrise goatfish dominated by the phytoplankton genus Thallasiothrix. The sunrise goatfish has significant dietary changes with increasing total length and time. The sunrise goatfish developed mix feeding strategies; specialist and generalist. Generalist strategy developed for all prey, except Thallasiothrix obtained by spesialist strategy. AbstrakPengetahuan tentang makanan dan strategi pola makan adalah penting untuk memahami peran ekologi dan kapasitas produktif populasi ikan. Informasi tersebut sangat penting untuk pengembangan rencana konservasi dan pengelolaan sumber daya ikan. Penelitian ini bertujuan untuk menganalisis makanan dan strategi pola makan ikan kuniran di per-airan Teluk Kendari. Pengambilan contoh dilakukan sekali sebulan dari bulan bulan Mei sampai November 2016, de-ngan jaring insang eksperimental berukuran mata jaring ¾, 1, 1 ¼, dan 1 ½ inci. Kebiasaan makanan dianalisis meng-gunakan metode indeks bagian terbesar, sedangkan strategi pola makan ditentukan melalui metode Costello yang dim-odifikasi oleh Amundsen. Jumlah ikan yang terkumpul sebanyak 386 ekor dengan kisaran panjang total 46,0–176,0 mm dan kisaran bobot 3,0–67,1 g. Ikan dikelompokkan kedalam tiga kelompok ukuran yaitu ukuran kecil (46,0–90,0 mm), sedang (91,0–134,0 mm), dan ukuran besar (135,0–176,0 mm). Ditemukan 28 jenis organisme makanan dalam saluran pencernaan ikan kuniran. Menu makanan didominasi oleh kelompok fitoplankton genus Thallasiothrix. Ikan kuniran mengalami perubahan makanan yang signifikan sejalan dengan bertambahnya ukuran panjang tubuh dan waktu. Dalam memanfaatkan makanan di perairan, kuniran umumnya mengembangkan strategi pola makan campuran antara generalis dan spesialis. Strategi pola makan generalis dikembangkan untuk memperoleh semua jenis mangsa, kecuali mangsa Thallasiothrix diperoleh dengan strategi pola makan spesialis. 

Individual-based model simulations of a zebra mussel (Dreissena polymorpha) induced energy shunt on walleye(Stizostedion vitreum) and yellow perch (Perca flavescens) populations in Oneida Lake, New York

1999 ◽  
Vol 56 (11) ◽  
pp. 2148-2160 ◽  
Author(s):  
Edward S Rutherford ◽  
Kenneth A Rose ◽  
Edward L Mills ◽  
John L Forney ◽  
Christine M Mayer ◽  
...  
Keyword(s):  
New York ◽  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Forage Fish ◽  
Stizostedion Vitreum ◽  
Individual Based Model ◽  
Oneida Lake ◽  
Model Predictions

Zebra mussels (Dreissena polymorpha) recently invaded North American aquatic ecosystems and are hypothesized to impact lakes by increasing water clarity through filtration and shunting energy from pelagic to benthic pathways (ES effect). We used an individual-based model of Oneida Lake, New York, walleye (Stizostedion vitreum) and yellow perch (Perca flavescens) populations to simulate ES effects on percids by lowering zooplankton density and production rates and increasing benthos rates. We performed 50-year simulations involving both zooplankton and benthos changes together and each change alone. We also performed simulations to determine robustness of model predictions under different assumed levels of zooplankton and benthos, increased forage fish and mayflies, and walleye stocking. Predicted ES effects were elimination of walleye high-recruitment years, resulting in a 30% reduction in adult walleye abundance. Yellow perch adult abundance increased by 6% due to reduced walleye predation. Neither component (zooplankton or benthos) of ES generated the same total response for yellow perch as both components together. Simulated walleye stocking and increased forage fish density had little effect on model predictions. Increased mayfly densities offset predicted ES effects by buffering predation on juvenile percids. Model predictions of ES impacts on percids generally were consistent with observed changes in Oneida Lake since zebra mussel arrived.

Limits to Growth of Young-of-the-Year Walleye (Stizostedion vitreum vitreum): An Individual-Based Model Perspective

1991 ◽  
Vol 48 (8) ◽  
pp. 1492-1499 ◽  
Author(s):  
Charles P. Madenjian
Keyword(s):  
Lake Erie ◽  
Growing Season ◽  
Encounter Rate ◽  
Stizostedion Vitreum ◽  
Prey Fish ◽  
Individual Based Model ◽  
Oneida Lake ◽  
Western Lake ◽  
Young Of The Year ◽  
Western Lake Erie

An individual-based model (IBM) accurately described the variation in growth exhibited between young-of-the-year (YOY) walleye (Stizostedion vitreum vitreum) cohorts from Oneida Lake (New York) and western Lake Erie. The IBM was used to develop a general explanation for the wide variability in growth exhibited by YOY walleye. Length of growing season and encounter rate, λ, between YOY walleye and the prey fish set the potential for growth in a particular aquatic system. Walleye spawning observations and observed YOY prey densities in Oneida Lake versus those for western Lake Erie corroborated these modeling results. Given a specific encounter rate and length of growing season, first-year growth of walleye was further controlled by size of prey fish relative to YOY walleye size, availability of prey fish throughout the summer and early fall months, and water temperature.

SEASONAL PREVALENCE OF SKIN TUMORS FROM WALLEYE (STIZOSTEDION VITREUM) FROM ONEIDA LAKE, NEW YORK

1988 ◽  
Vol 24 (2) ◽  
pp. 292-298 ◽  
Author(s):  
Paul R. Bowser ◽  
Marilyn J. Wolfe ◽  
John L. Forney ◽  
Gregory A. Wooster
Keyword(s):  
New York ◽  
Skin Tumors ◽  
Stizostedion Vitreum ◽  
Seasonal Prevalence ◽  
Oneida Lake

scholarly journals Ecological Observations on Hybrid Populations of European Plethodontid Salamanders, Genus Speleomantes

Diversity ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 285
Author(s):  
Enrico Lunghi ◽  
Fabio Cianferoni ◽  
Stefano Merilli ◽  
Yahui Zhao ◽  
Raoul Manenti ◽  
...  
Keyword(s):  
Body Condition ◽  
Parental Species ◽  
Stomach Contents ◽  
Trophic Niche ◽  
Natural Hybrid ◽  
Ecological Information ◽  
Total Length ◽  
Plethodontid Salamanders ◽  
The Future ◽  
First Time

Speleomantes are the only plethodontid salamanders present in Europe. Multiple studies have been performed to investigate the trophic niche of the eight Speleomantes species, but none of these studies included hybrid populations. For the first time, we studied the trophic niche of five Speleomantes hybrid populations. Each population was surveyed twice in 2020, and stomach flushing was performed on each captured salamander; stomach flushing is a harmless technique that allows stomach contents to be inspected. We also assessed the potential divergence in size and body condition between natural and introduced hybrids, and their parental species. Previously collected data on Speleomantes were included to increase the robustness of these analyses. In only 33 out of 134 sampled hybrid Speleomantes we recognized 81 items belonging to 11 prey categories. The frequency of empty stomachs was higher in females and individuals from natural hybrid populations, whereas the largest number of prey was consumed by males. We compared the total length and body condition of 685 adult salamanders belonging to three types of hybrids and three parental (sub)species. Three group of salamanders (one hybrid and two parental species) showed significantly larger size, whereas no difference in body condition was observed. This study provided novel ecological information on Speleomantes hybrid populations. We also provided insights into the potential divergence between hybrids and parental species in terms of size and body condition. We discuss our findings, and formulate several hypotheses that should be tested in the future.

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