Assimilation of shrimp farm sediment by Holothuria scabra : a coupled fatty acid and stable isotope approach

• Published in: Aquatic living resources (Montrouge) Vol. 33; no. 3; p. 3
• Main Authors: Mathieu-Resuge, Margaux, Le Grand, Fabienne, Schaal, Gauthier, Kraffe, Edouard, Lorrain, Anne, Letourneur, Yves, Lemonnier, Hugues, Benoît, Julie, Hochard, Sébastien
• Format: Journal Article
• Language: English
• Published: Les Ulis EDP Sciences 2020
• Subjects: Ammonium nitrogen; Animals; Aquaculture; Aquaculture systems; Assimilation; Biodiversity and Ecology; Biological assimilation; Corn; Environmental Sciences; Experimental culture; Experiments; Farm buildings; Farming; Farming systems; Farms; Fatty acids; Fish; Fish meal; Fishmeal; Food; Food selection; Food sources; Foods; Holothuria scabra; holothurid; Isotopes; Life Sciences; Litopenaeus stylirostris; Marine; Marine crustaceans; Marine invertebrates; Meals; Mesocosms; Nitrogen; Organic carbon; Organic compounds; Organic loading; Organic matter; Polyculture; Polyculture (aquaculture); rotational co-culture; Sediment; Sedimentation; Sediments; Shrimp culture; shrimp-farming; Stable isotopes; New Caledonia; stable isotopes; rotational co-culture; ACL; shrimp-farming; Fatty acids; Holothurid
• ISSN: 1765-2952; 0990-7440; 1765-2952
• DOI: 10.1051/alr/2020004

Deposit-feeding sea cucumbers are efficient nutrient recyclers and have the potential to contribute to the limitation of organic matter load in polyculture or integrated aquaculture systems. Assessing how they assimilate organic matter originating from other farmed species is therefore important for the development of such multi-species farming systems. Here, a coupled stable isotope − fatty acid approach was used to characterize the assimilation of organic matter from shrimp (Penaeus stylirostris) farming by Holothuria scabra in an experimental culture system. H. scabra were reared in mesocosms on shrimp farming-originating sediment with and without additional food sources (maize and fish meals). Although fatty acid results did indicate that shrimp-farming sediment was assimilated by holothurids, we found no evidence of maize waste and fish meal contribution to H. scabra organic carbon (no effect on δ13C, no accumulation of meal-specific fatty acids). However, a strong effect of fish meal on H. scabra δ15N was observed, suggesting that this additional food source could represent an alternative source of nitrogen for holothurids. Finally, this study supports the culture of H. scabra as a perspective to reduce sedimentary organic matter excess associated with shrimp farms, and suggest that the addition of selected food sources might contribute to increasing the content in some nitrogen organic compounds in holothurid tissues.