Stomach Capacities of Six Freshwater Fishes

Gosch, Nathan J.C.; Pope, Kevin L.; Michaletz, Paul H.

doi:10.1080/02705060.2009.9664342

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…Gape limitation likely affected consumption rate on white perch more in Pawnee Lake than in Branched Oak Lake because predators were smaller (Gosch et al, 2010) and white perch were larger in Pawnee Lake (Chizinski et al, 2010). When predators are not gape-limited, stomach capacity (i.e., how much the stomach can hold) could be another physical limitation on consumption (Truemper and Lauer, 2005;Gosch et al, 2009). Other factors such as growth rate of predators and prey, predator hunting mode, prey avoidance behavior, and habitat overlap between predators and prey could also influence consumption rate.…”

Section: Discussionmentioning

confidence: 99%

Using consumption rate to assess potential predators for biological control of white perch

Gosch

Pope

2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words:biological control, predation, consumption rate, white perch, Morone americana Control of undesirable fishes is important in aquatic systems, and using predation as a tool for biological control is an attractive option to fishery biologists. However, determining the appropriate predators for biological control is critical for success. The objective of this study was to evaluate the utility of consumption rate as an index to determine the most effective predators for biological control of an invasive fish. Consumption rate values were calculated for nine potential predators that prey on white perch Morone americana in Branched Oak and Pawnee reservoirs, Nebraska. The consumption rate index provided a unique and insightful means of determining the potential effectiveness of each predator species in controlling white perch. Cumulative frequency distributions facilitated interpretation by providing a graphical presentation of consumption rates by all individuals within each predator species. Largemouth bass Micropterus salmoides, walleye Sander vitreus and sauger S. canadensis were the most efficient white perch predators in both reservoirs; however, previous attempts to increase biomass of these predators have failed suggesting that successful biological control is unlikely using existing predator species in these Nebraska reservoirs. RÉSUMÉUtilisation du taux de consommation dans l'évaluation des prédateurs potentiels pour un contrôle biologique de la perche blanche Mots-clés :contrôle biologique, prédation, taux de consommation, Le contrôle des poissons indésirables est important dans les écosystèmes aquatiques et l'utilisation de la prédation comme outil de contrôle biologique est une option attractive pour les biologistes des pêches. Toutefois, déterminer les bons prédateurs pour un contrôle biologique est crucial pour sa réussite. L'objectif de cette étude a été de tester l'utilité du taux de consommation comme indice de détermination des prédateurs les plus appropriés pour le contrôle biologique d'un poisson invasif. Les valeurs du taux de consommation ont été calculées pour neuf prédateurs potentiels de la perche blanche Morone americana dans les réservoirs

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Section: Discussionmentioning

confidence: 99%

Using consumption rate to assess potential predators for biological control of white perch

Gosch

Pope

2011

Knowl. Managt. Aquatic Ecosyst.

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“…Within the limits imposed by gape size, fishes with big stomachs should be able to feed on a wider range of prey sizes than fishes with small stomachs (e.g. Gosch et al 2009), but when the stomach is partially full, fish might choose small rather than large food items (Truemper and Lauer 2005). In this study, the relationship between average prey size and stomach fullness was positive, but was only statistically significant for the exponential model, suggesting that trout may be able to use relatively large food items regardless of their stomach fullness.…”

Section: Discussionmentioning

confidence: 99%

Adaptive flexibility in the feeding behaviour of brown trout: optimal prey size

Sánchez‐Hernández

Cobo

2015

Zool. Stud.

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Background: Brown trout, Salmo trutta Linnaeus, 1758, is a species of significant conservation and socio-economic importance. A consequence of this importance is the enormous amount of literature that has been published on the species in the last few decades. In general terms, brown trout has been considered as a size-selective predator, even though it is able to feed on a wide range of prey sizes. Nevertheless, there are still some gaps in our knowledge, for example the theoretical relationship between prey numbers and prey sizes eaten by the fish need to be addressed. This research aimed to study optimal prey size in the environment (benthos and drift) as well as the potential relationship between prey size and two other feeding variables (prey numbers and stomach fullness). Additionally, ontogenetic shifts in these variables were addressed.

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“…Stomach capacity was estimated by plotting sample volume (i.e. the cumulative volume of all prey items in a stomach) by total length similar to Gosch et al (2009). Fish were divided into their respective length groups, and an exponential regression was fit to the largest data point within each length group to predict maximum stomach capacity based on fish length.…”

Section: Methodsmentioning

confidence: 99%

Flathead catfishPylodictis olivarisdiet composition during extreme flow events in a large river

Hogberg

Pegg

2016

Journal of Freshwater Ecology

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Record flooding during 2011 caused the middle Missouri River to inundate its floodplain for much of the summer and fall. Subsequently, near-record drought during 2012 confined the river within its channel all year. Flathead catfish Pylodictis olivaris diet was compared between 2011 and 2012 to assess several aspects of their trophic ecology during two years with overtly different hydrographs. A total of 629 flathead catfish were collected across years and results indicated that stomachs were more full (p < 0.001) and fish were in better condition (p < 0.001) during 2011. Furthermore, empty stomachs were less frequent (p D 0.003) and flathead catfish transitioned to piscivory at smaller sizes during the flood year. Future work to assess the influence of hydrology on large river food webs will help resource managers determine the magnitude and frequency of flooding needed to maintain or enhance large river fisheries.

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Stomach Capacities of Six Freshwater Fishes

Cited by 9 publications

References 25 publications

Using consumption rate to assess potential predators for biological control of white perch

Using consumption rate to assess potential predators for biological control of white perch

Adaptive flexibility in the feeding behaviour of brown trout: optimal prey size

Flathead catfishPylodictis olivarisdiet composition during extreme flow events in a large river

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