Testing Assumptions of Fish Bioenergetics Models by Direct Estimation of Growth, Consumption, and Activity Rates
Boisclair, Daniel; Sirois, Pascal; Boisclair, Daniel; Universite de Montréal, Departement des sciences biologiques; Sirois, Pascal; Station de biologie des Laurentides de l'Universite de Montréa
Журнал:
Transactions of the American Fisheries Society
Дата:
1993
Аннотация:
AbstractWe tested the hypothesis that activity rates can represent a large and variable component of a fish's energy budget. We executed five experiments between July 15 and August 2, 1991, to estimate growth, consumption, and activity rates of five young-of-the-year brook trout Salvelinus fontinalis kept in field enclosures. Mean fish wet weight decreased from 3.47 to 2.89 g during our study. This represented a total loss of 3,544 cal (all fish combined). Consumption rates averaged 0.18 g dry·100 g wet<sup>–1</sup>·d<sup>–1</sup>. The total quantity of food consumed by the fish inside the enclosure ranged from 112.9 to 188.8 cal·d<sup>–1</sup>. Median swimming speed ranged from 3.9 to 7.9 cm·s<sup>–1</sup>. Energetic costs associated with spontaneous swimming (all fish combined) ranged from 94.0 to 498.1 cal·d<sup>–1</sup>. Spontaneous activity metabolic rate (standard metabolism + net activity rate) represented 1.6–3.8 times the costs associated with standard metabolism. Our study supported the hypothesis that activity rates can be a large and variable component of a fish's energy budget.
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