Digestive Tract Evacuation in Northern Squawfish (<i>Ptychocheilus oregonensis</i>)

Beyer, Jean M.; Lucchetti, Gino; Gray, Gerry

doi:10.1139/f88-064

Cited by 33 publications

(24 citation statements)

References 8 publications

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“…Using the model of Beyer et al (1988), 90% of a salmonid meal would be evacuated from a 1000 g northern pikeminnow within c. 18 h in April-May (c. 12 C) and within c. 6 h in June-August (c. 19 C). Studies with cod Gadus morhua L. and rainbow trout O. mykiss (Walbaum) have shown that indigestible particles (glass beads and pieces of chitin) may be retained about twice as long as digestible material (Kionka & Windell, 1972;dos Santos & Jobling, 1991).…”

Section: Discussionmentioning

confidence: 99%

Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river

Petersen

2001

Journal of Fish Biology

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Predation by northern pikeminnow Ptychocheilus oregonensis on juvenile salmonids Oncorhynchus spp. occurred probably during brief feeding bouts since diets were either dominated by salmonids (>80% by weight), or contained other prey types and few salmonids (<5%). In samples where salmonids had been consumed, large rather than small predators were more likely to have captured salmonids. Transects with higher catch-per-unit of effort of predators also had higher incidences of salmonids in predator guts. Predators in two of three reservoir areas were distributed more contagiously if they had preyed recently on salmonids. Spatial and temporal patchiness of salmonid prey may be generating differences in local density, aggregation, and body size of their predators in this large river.

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Section: Discussionmentioning

confidence: 99%

Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river

Petersen

2001

Journal of Fish Biology

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“…Transforming the percentage values by either square root or natural logarithm both provided good linear fits to the data. The negative exponential (natural logarithm) model (y = ae-bx) was chosen because it has been shown to best describe the emptying curve for fishes feeding on relatively low energy diets and ingesting small particles (Jobling 1986(Jobling , 1987 and for other species of stomachless fishes (Grove & Crawford 1980, Persson 1982, Beyer et al 1988. Thus, alimentary tract evacuation rate was calculated for each fish from the linear regression equation:…”

Section: Methodsmentioning

confidence: 99%

Energetics of food selection by the herbivorous parrotfish Sparisoma radians: roles of assimilation efficiency, gut evacuation rate, and algal secondary metabolites

Targett¹,

Targett²

1990

Mar. Ecol. Prog. Ser.

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Experiments were conducted to investigate the effect of plant energy content and the presence of secondary metabolites on the assirmlation efficiency. ahmentary tract evacuation rate, and feeding rate of the bucktooth parrotfish Sparisoma radians. Alimentary tract evacuation rate was significantly greater (ca 2 . 5~) when the fish fed on the relatively energy-poor calcareous green alga Halimeda incrassata than on the seagrass Thalassia testudinum. The greater evacuation rate of H. incrassata provided the fish the capacity to increase consumption rate to compensate for low food energy content. However, due to unpalatable secondary chemical metabolites present in H. incrassata. actual biomass consumed per unit time was less than for T testudinum. Experiments using T testudinum blades coated with H. incrassata organic crude extract showed that the secondary metabolites had no effect on the fish's assimilation efficiency or gut evacuation rate. The increased rate of H. incrassata evacuation is more than sufficient to allow compensation for lower gross energy content. S. radians can increase evacuation rate sufficiently to allow compensation for differences in available energy over the normal range for most plants consumed in nature. Studies of herbivorous fish foraging and feeding energetics must consider differences in alimentary tract evacuat~on rate and feeding rate, and the effects of secondary metabolites, in addition to the assimilation efficiency, structural defense and relative plant abundance factors usually considered.

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“…Flowerdew Beyer et al, 1988;Temming & Andersen, 1994;Andersen, 1998 Ration Cod Gadus morhua, whiting Merlangius merlangus Olson & Boggs, 1986;Bromley, 1987;Bromley, 1988;Rosch, 1987;Elliott, 1991;Singh-Renton & Bromley, 1996 Fish mass at a constant R g Absolute GER Increases Walleye Stizostedion vitreum vitreum Swenson & Smith, 1973;Jobling et al, 1977;Flowerdew & Grove, 1979;Beyer et al, 1988;Hö lker & Temming, 1996 Fish mass at a constant R % Talbot et al, 1984;Olson & Boggs, 1986;Rosch, 1987;Elliott, 1991;Hayward & Weiland, 1998;Hop & Tonn, 1998 Ration Jobling et al, 1977;Flowerdew & Grove, 1979;Rosch, 1987;Rogers & Burley, 1991;…”

Section: Ukmentioning

confidence: 99%

Digestion rate, gut passage time and absorption efficiency in the Antarctic spiny plunderfish

Boyce

Murray

Peck

2000

Journal of Fish Biology

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The absolute gut evacuation rate (GER) (g day 1 ) of Harpagifer antarcticus increased with increasing ration mass, fish mass only influenced the absolute GER at a daily ration level of 0·3% wet fish mass (approximately a maintenance ration). The relative GER (% of meal fed day 1 ) was also affected differently by fish and ration mass depending on the relative ration level being fed; at rations of 0·7% wet fish mass or above the relative GER decreased with increasing fish or ration mass (in such a way that the absolute GER remained constant and unaffected by fish mass). At maintenance (0·3% wet fish mass) rations the relative GER was not affected by fish size or ration mass. Thus, there appears to be a ration threshold above which the digestion physiology alters. Mass-specific GER (% g fish 1 day 1 ) decreased with increasing fish mass. Within a set relative ration level (% wet fish mass) an increase in fish mass decreased the mass-specific GER. At a fixed ration mass, an increase in fish mass (i.e. a reduction in the ration expressed as % fish mass) resulted in a decrease in mass-specific GER. Gut evaluation time (GET) decreased and absorption efficiency (A) increased with increasing absolute GER. The effect of ration and fish mass on the absolute and relative GER followed the same pattern irrespective of the diet, however the A and GER (% day 1 and g day 1 ) were higher and the GET shorter when the fish were fed shelled krill rather than amphipods. 2000 The Fisheries Society of the British Isles

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Digestive Tract Evacuation in Northern Squawfish (Ptychocheilus oregonensis)

Cited by 33 publications

References 8 publications

Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river

Density, aggregation, and body size of northern pikeminnow preying on juvenile salmonids in a large river

Energetics of food selection by the herbivorous parrotfish Sparisoma radians: roles of assimilation efficiency, gut evacuation rate, and algal secondary metabolites

Digestion rate, gut passage time and absorption efficiency in the Antarctic spiny plunderfish

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