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Abstract

Abstract
The timing of larval metamorphosis in summer flounder, Paralichthys dentatus, from the same cohort (i.e., siblings with the
same parents) and among cohorts (different parents) is variable due to large differences in individual growth rates. In an effort to
understand the energetic basis for growth rate differences, rates of routine (RR) and specific dynamic action (RSDA) respiration (μg
O2/fish/h) were measured in groups of newly metamorphosed summer flounder and compared among fish of different sizes (15, 20,
25 and 30 mm total length, TL) and between fast- and slow-growing fish from five cohorts each having a different set of parents.
Although rates of RR significantly increased with increasing fish size (RR=3.02±1.04 DM 0.88 ± 0.12, they were not significantly
different between the fastest and slowest growing fish within a cohort. Respiration rates rapidly increased during feeding and the
mean±SD peak RSDA was 1.91±1.29 ·RR. The mean±SD energy loss due to RSDA was 15.6±11.5% of the ingested prey energy.
Differences in RSDA were noted among fish of different sizes and between fast- and slow-growing fish. However, the results of this
study suggest that the energetic basis for growth differences among summer flounder appears to result from processes related to
energy intake (e.g., food consumption) rather than those related to routine or feeding energy loss.
© 2006 Elsevier B.V. All rights reserved.

Item Type:	Article
Authors/Creators:	Katersky, RS and Peck, MA and Bengston, DA
Keywords:	Summer flounder; Paralichthys dentatus; Oxygen consumption; Specific dynamic action; Growth rate
Journal or Publication Title:	Aquaculture
ISSN:	0044-8486
DOI / ID Number:	10.1016/j.aquaculture.2006.02.062
Additional Information:	The definitive version is available at http://www.sciencedirect.com
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