Stable isotopes provide a powerful tool for quantifying dietary support of fish tissue growth among foods with distinct isotope contents. Manufactured feeds provided to fish in aquaculture settings are typically different in δ13C, δ15N, and/or δ34S from alternative foods used to support growth in tanks or ponds (e.g., Artemia, zooplankton; Hesslein et al., 1993; Schroeder, 1983; Su et al., 2008). Thus, the contribution of feeds to fish tissue growth can be easily quantified relative to alternate foods using mass-balance mixing models. For example, Gamboa- Delgado et al. (2008) and Jomori et al. (2008) leveraged natural isotopic differences between live Artemia nauplii and dry feeds to quantify the relative contributions of these two foods in combination to growth of larval Senegalese sole (Solea senegalensis) and pacu (Piaractus mesopotamicus), respectively. In both studies, Artemia contributed more to fish growth than feed, and growth was slower
when fish were provided only the dry feed rather than a mixture of the two foods. Both studies also showed that fastest growth and highest survival were achieved by providing Artemia only or a mixture of both foods
Stable isotopes provide a powerful tool for quantifying dietary support of fish tissue growth among foods with distinct isotope contents. Manufactured feeds provided to fish in aquaculture settings are typically different in δ13C, δ15N, and/or δ34S from alternative foods used to support growth in tanks or ponds (e.g., Artemia, zooplankton; Hesslein et al., 1993; Schroeder, 1983; Su et al., 2008). Thus, the contribution of feeds to fish tissue growth can be easily quantified relative to alternate foods using mass-balance mixing models. For example, Gamboa- Delgado et al. (2008) and Jomori et al. (2008) leveraged natural isotopic differences between live Artemia nauplii and dry feeds to quantify the relative contributions of these two foods in combination to growth of larval Senegalese sole (Solea senegalensis) and pacu (Piaractus mesopotamicus), respectively. In both studies, Artemia contributed more to fish growth than feed, and growth was slowerwhen fish were provided only the dry feed rather than a mixture of the two foods. Both studies also showed that fastest growth and highest survival were achieved by providing Artemia only or a mixture of both foods
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