Growth and Physiological Performance in Growth Phenotypes of the Carpet Shell Clam (Ruditapes decussatus) Fed Diets of Variable Lipid/Carbohydrate Ratios
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Date
2023-08-12Author
Arranz Juárez, Kristina Arantxa
Martínez Patiño, Dorotea
Navarro Adorno, Enrique
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Aquaculture Nutrition 2023 : (2023) // Article ID 3622475
Abstract
Mixed suspensions of phytoplankton and yeast cells in different proportions were designed to achieve diets with a range of
variation (0.6–2.2) in the ratio of lipid to carbohydrate while maintaining protein content constant. Juvenile specimens of the
carpet shell clam (Ruditapes decussatus) from two segregated growth phenotypes (fast and slow growers) were food conditioned
and the physiological components of the energy balance were determined with these different diet compositions in order to assess
the combined effects of endogenous and nutritional factors on growth performance. Conditioning to lipid-rich diets increased
growth rate relative to conditioning to carbohydrate-rich diets and resulted in higher scope for growth values in both growth
groups. These dietary effects are mainly driven by differences in the absorption efficiency (AE) found between clams fed different
food compositions, although the present results do not allow to ascertain whether the reduced AE recorded with the carbohydraterich
diets results from reduced digestibility of yeasts cells due to structural restrictions or either reflects the digestive imbalance of
lipids associated to higher production of metabolic fecal losses. Greater phenotypic plasticity was seen to enable the fast-growing
clams fed a carbohydrate-rich diet to overcome the above digestive limitations through an overfeeding response; however, the
resource to such kind of physiological mechanism appeared limited by the nutritional conditions (energetic status) prevailing
during the conditioning phase.
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Except where otherwise noted, this item's license is described as © 2023 Kristina Arranz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.