Lipid class dynamics during larval ontogeny of sea scallops, Placopecten magellanicus, in relation to metamorphic success and response to antibiotics

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1016/j.jembe.2005.09.008
Author	Search for: Pernet, Fabrice¹; Search for: Bricelj, V. Monica¹; Search for: Cartier, Simon
Affiliation	National Research Council of Canada. NRC Institute for Marine Biosciences
Format	Text, Article
Subject	bacteria; bivalve; metamorphosis; triacylglycerol; vibrio
Abstract	This study examines ontogenetic changes in lipid class composition in relation to survival and growth of five batches of sea scallops, Placopecten magellanicus, from egg to dissoconch stages. It also investigates the effects of antibiotic addition during metamorphosis to determine whether transient treatment during this critical period is effective in increasing metamorphic success. The top-performing larvae (growth rate: 4.7-5.0 μm day⁻¹, dissoconch survival: 32–57%) were characterized by a pronounced increase in absolute (ng larva⁻¹) and relative concentrations (wt.% of total lipid) of triacylglycerol (TAG) during the pre-metamorphic period, followed by utilization during metamorphosis (0.5–1.4 μg day⁻¹ larva⁻¹). In contrast, the low-performing scallops (growth rate: 3.6–4.5 μm day⁻¹, dissoconch survival < 1%) exhibited a constant, low level of TAG. These results strongly suggest that the accumulation of TAG during the pre-metamorphic period is a good predictor of scallop performance as measured by survival to dissoconch stage. Antibiotic treatment enhanced absolute and relative TAG concentrations in pre-metamorphic scallops and resulted in higher post-metamorphic survival and TAG concentration than in non-treated controls. However, the proportion of dissoconch to live larvae at the end of the experiment was significantly lower with antibiotic treatment (8% vs. 20% in controls), thus resulting in comparable yields of dissoconch larvae ∼ 8% irrespective of treatment. A possible negative effect of antibiotic treatment on bacterial induction of settlement and metamorphosis of sea scallop larvae is suggested.
Publication date	2006-02-21
Terms of use	Copyright © 2005 Elsevier B.V. All rights reserved.
In	Journal of Experimental Marine Biology and Ecology 329, no. 2 (21 February 2006): 265–280.
Language	English
Peer reviewed	Yes
NRC number	NRCC 55836 1590
NPARC number	3538488
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Record identifier	09e1059f-9860-41a8-97ab-14e6f279ffc6
Record created	2009-03-01
Record modified	2020-04-22

Date modified:: 2024-12-21