TY - JOUR
T1 - Diet rather than temperature determines the biochemical composition of the ragworm Hediste diversicolor (OF Müller, 1776) (Annelida: Nereidae)
AU - Malzahn, Arne M.
AU - Villena-Rodríguez, Andrea
AU - Monroig, Óscar
AU - Johansen, Åsmund
AU - Castro, L. Filipe C.
AU - Navarro, Juan C.
AU - Hagemann, Andreas
N1 - Publisher Copyright:
© 2023 The Author(s)
PY - 2023/5/15
Y1 - 2023/5/15
N2 - The polychaete Hediste diversicolor is known to recycle side streams from aquaculture and biogas production. We conducted a feeding experiment to evaluate whether rearing temperature or mixtures of these two side streams enhances biomass production and fatty acid composition. We reared H. diversicolor along a 5-temperature gradient ranging from 5.8 °C to 17.1 °C and a 4-step gradient form 100% aquaculture sludge to 100% solid biogas digestate. Formulated fish feed served as a control diet. Polychaetes increased growth rate with increasing temperature, ranging from 0.01 at 5.8 °C to 0.14 at 17.1 °C, while survival was inversely affected by temperature with 100% survival at 5.8 °C and 70% survival at 17.1 °C. Diet had a less pronounced effect on polychaete survival, and no significant effect on growth rates. Contrasting to growth, the fatty acid composition of the polychaetes was not affected by temperature but was highly influenced by diet, as polychaetes did not cluster by rearing temperature but by the diets they received. In conclusion, H. diversicolor can be utilized as a recycler of aquaculture and biogas side streams, and production temperature can be optimized for growth without compromising fatty acid composition and quality of the polychaetes.
AB - The polychaete Hediste diversicolor is known to recycle side streams from aquaculture and biogas production. We conducted a feeding experiment to evaluate whether rearing temperature or mixtures of these two side streams enhances biomass production and fatty acid composition. We reared H. diversicolor along a 5-temperature gradient ranging from 5.8 °C to 17.1 °C and a 4-step gradient form 100% aquaculture sludge to 100% solid biogas digestate. Formulated fish feed served as a control diet. Polychaetes increased growth rate with increasing temperature, ranging from 0.01 at 5.8 °C to 0.14 at 17.1 °C, while survival was inversely affected by temperature with 100% survival at 5.8 °C and 70% survival at 17.1 °C. Diet had a less pronounced effect on polychaete survival, and no significant effect on growth rates. Contrasting to growth, the fatty acid composition of the polychaetes was not affected by temperature but was highly influenced by diet, as polychaetes did not cluster by rearing temperature but by the diets they received. In conclusion, H. diversicolor can be utilized as a recycler of aquaculture and biogas side streams, and production temperature can be optimized for growth without compromising fatty acid composition and quality of the polychaetes.
KW - Aquaculture waste
KW - Aquafeed
KW - Bioremediation
KW - Circular economy
KW - Fatty acids
KW - Homeoviscous adaptation
KW - Nutrient recycling
KW - Salmon aquaculture
KW - Side streams
KW - Solid biogas digestate
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UR - https://www.mendeley.com/catalogue/dd1cc1b2-6da4-351f-ade1-ea72319de23c/
U2 - 10.1016/j.aquaculture.2023.739368
DO - 10.1016/j.aquaculture.2023.739368
M3 - Article
AN - SCOPUS:85148094608
SN - 0044-8486
VL - 569
JO - Aquaculture
JF - Aquaculture
M1 - 739368
ER -