Interaction of Low pH and starvation on Body Weight and Composition of Young-of-Year Smallmouth Bass (Micropterus dolomieui)

Autor:	G. L. Cunningham, B. J. Shuter
Rok vydání:	1986
Předmět:	chemistry.chemical_classification food.ingredient biology Chemistry Ecology Micropterus Aquatic Science biology.organism_classification Body weight Bass (fish) Animal science food Interactive effects Dry weight Organic matter Chemical composition Ecology Evolution Behavior and Systematics
Zdroj:	Canadian Journal of Fisheries and Aquatic Sciences. 43:869-876
ISSN:	1205-7533 0706-652X
DOI:	10.1139/f86-107
Popis:	Effects of overwinter starvation on the body composition of young-of-year smallmouth bass (Micropterus dolomieui) were examined in laboratory and field studies. Interactive effects of starvation and low pH on body composition were examined in the laboratory. Changes in body composition associated with starvation were similar in laboratory and field studies: on a dry weight basis, the amount of water, ash, Ca, K, and Na increased progressively in both laboratory and wild fish. The amount of Cl per unit dry weight showed a moderate increase in the laboratory fish and a large decline in the wild fish. The effects on starving fish of 6-wk chronic exposures to nonlethal pH levels of 4.0–7.0 were examined in the laboratory. No pH effect was noted for levels greater than 5.0. Losses of water, ash, Ca, K, Cl, and Na increased as the pH declined. There was no consistent effect of pH on rate of loss of ash-free organic matter. The results suggest that starvation may reduce the tolerance of young smallmouth bass to low pH through progressive weakening of the osmoregulatory system.
Databáze:	OpenAIRE
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