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Digestive tract evacuation in northern squawfish ptychocheilus oregonensis

, : Digestive tract evacuation in northern squawfish ptychocheilus oregonensis. Canadian Journal of Fisheries & Aquatic Sciences 45(3): 548-553

Digestive tract evacuation in northern squawfish (Ptychocheilus oregonensis) (170-1900 g) was studied in fish allowed to feed voluntarily on salmon (4-70 g) at three water temperatures (10, 15, and C). Squawfish were sacrificed at 1- or 2-h intervals until evacuation approximated 90%. Amount of food evacuated for a given time interval increased approximately three times as the temperature was increased and as the prey weight was increased and two times as the predator weight was increased. The 90% emptying time (ET90) decreased by about two thirds as the temperature doubled and by about one half as the predator weight increased 10 times, but approximately doubled when the prey weight increased 4 times. Two-fish meals (17-20 g each, 35-39 g total) were evacuated more slowly than meals of one fish weighing 17-20 g, but at the same rate as meals of one fish weighing 35-40 g. Equations derived are easily applied to a wide range of water temperatures, prey weights, and predator weights.

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Accession: 005161789

DOI: 10.1139/f88-064

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Related references

Patten, B.G.; Rodman, D.T., 1969: Reproductive behavior of northern squawfish, Ptychocheilus oregonensis. Transactions of the American Fisheries Society, 98: 108-111

Lin, D.M.rrissey, M., 1995: Northern squawfish (Ptychocheilus Oregonensis) for Surimi production. Surimi was made from freshwater Northern squawfish (Ptychocheilus oregonensis) and tested for processing characteristics and quality. The surimi yield (two washes) averaged 17.9% with moisture 72.10% and protein content 17.54%. Stress and strain r...

Lin, D.M.rrissey, M., 1994: Iced storage characteristics of northern squawfish (Ptychocheilus oregonensis). Journal of aquatic food product technology(2): 25-43

Steigenberger, L.W.; Larkin, P.A., 1974: Feeding activity and rates of digestion of northern squawfish (Ptychocheilus oregonensis). Northern squawfish (Ptychocheilus oregonensis) caught in Lakes Griffen and Cultus, British Columbia, had peak activity and feeding in twilight and dark hours. At Griffen Lake, squawfish force-fed on 2 g redside shiner (Richardsonius balteatus) and...

Cech, J.J.Jr; Castleberry, D.T.; Hopkins, T.E., 1994: Temperature and CO-2 effects on blood O-2 equilibria in northern squawfish, Ptychocheilus oregonensis. In vitro blood O-2 equilibrium curves were constructed at 9, 1 5, 1 8, and 21 degree C from temperature-acclimated northern squawfish, Ptychocheilus oregonensis. At low PCO-2 ( lt 1 mm Hg, 1 mm Hg = 133.32 Pa), P-50s generally showed variable incr...

Andros J.D.; Garton R.R., 1980: Acute lethality of copper cadmium and zinc to northern squawfish ptychocheilus oregonensis. Flow-through acute toxicity tests on juvenile northern squawfish (P. oregonensis) were conducted with Cu, Cd, and Zn. The 96-h LC50 were 18 .mu.g/l for Cu, 1104 .mu.g/l for Cd, and 3693 .mu.g/l for Zn in C water. These values, when comp...

Ruelle R., 1969: A chemical selectively lethal to squawfish ptychocheilus oregonensis and ptychocheilus umpquae. Transactions Of The American Fisheries Society: 676-684

Beamesderfer, Raymond, C., 1992: Reproduction and early life history of northern squawfish, Ptychocheilus oregonensis, in Idaho's St. Joe River. Reproduction and early life history of northern squawfish, Ptychocheilus oregonensis, was investigated in Idaho's St. Joe River from 1980-1981. Spawning occurs in large aggregations which mill near the substrate to broadcast eggs and milt. Ma...

Buchanan, David, V., 1980: Northern squawfish (Ptychocheilus oregonensis) predation on juvenile salmonids in the Willamette River basin

Bentley W.W.; Dawley E.M., 1981: Effects of super saturated dissolved atmospheric gases on northern squawfish ptychocheilus oregonensis. Northern squawfish, P. oregonensis, were confined in shallow tanks for 12 days to study their tolerance to various concentrations of total dissovled atmospheric gases (TDG). The TDG concentrations ranged from 100-126% of saturation, levels that oc...