Dietary Inclusion of Kappaphycus alvarezii Seaweed Processing Residue in Aquacultured Lebranche Mullet (Mugil liza): A Preliminary Study on Growth Performance, Physiological Responses and Fillet Composition
- 1Marine Fish Farming Laboratory (LAPMAR), Federal University of Santa Catarina (UFSC), Florianópolis 88061-615, SC, Brazil
- 2Laboratory of Health of Aquatic Organisms (AQUOS), Federal University of Santa Catarina (UFSC), Florianópolis 88034-257, SC, Brazil
Abstract
The use of residual biomass from industrial seaweed processing in aquafeeds may represent a potential route for the reuse of residual biomass within a circular-economy framework. This proof-of-concept trial evaluated the effects of dietary supplementation with wet solid residue from the seaweed Kappaphycus alvarezii in Mugil liza over 80 days under a mixed-feeding system. The treatments comprised nominal wet-residue levels corresponding to 0, 6, 12, 18, 24 and 30% of the reference daily feed intake, equivalent to 0, 0.7, 1.5, 2.2, 2.9 and 3.5% of the dietary mixture on a dry-matter basis, respectively. No mortality occurred, indicating no detectable adverse effects under the tested conditions. Haematological data indicated a pattern consistent with hormesis, with the 6% and 12% nominal wet-residue levels associated with increased erythropoietic responses. Intestinal integrity and fillet nutritional quality were preserved; however, eviscerated yield showed numerical variation among treatments, with the lowest median value observed at 18%. The mixed-feeding strategy allowed a reduction in commercial feed input without compromising growth. Overall, the tested nominal wet-residue levels, corresponding to 0.7–3.5% of the dietary mixture on a dry-matter basis, were not associated with detectable impairment of survival, intestinal integrity or fillet quality. Future studies should employ randomized designs with replicated experimental units to further explore the potential of using K. alvarezii processing residue as a partial replacement for traditional feed components in M. liza production.
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BibTeX
@article{rodrigues2026dietary,
title = {{Dietary Inclusion of Kappaphycus alvarezii Seaweed Processing Residue in Aquacultured Lebranche Mullet (Mugil liza): A Preliminary Study on Growth Performance, Physiological Responses and Fillet Composition}},
author = {Gabriel Dutra Rodrigues and Vanessa Martins da Rocha and Ulysses da Silva Palma and Sabrina Lara da Luz and Domickson Silva Costa and Marco Shizuo Owatari and Aline Brum Figueredo Ruschel and Vinicius Ronzani Cerqueira and Caio Magnotti},
journal = {Fishes},
year = {2026},
month = sep,
doi = {10.3390/fishes11100564},
url = {https://doi.org/10.3390/fishes11100564},
note = {CC BY},
}
RIS
TY - JOUR
TI - Dietary Inclusion of Kappaphycus alvarezii Seaweed Processing Residue in Aquacultured Lebranche Mullet (Mugil liza): A Preliminary Study on Growth Performance, Physiological Responses and Fillet Composition
AU - Gabriel Dutra Rodrigues
AU - Vanessa Martins da Rocha
AU - Ulysses da Silva Palma
AU - Sabrina Lara da Luz
AU - Domickson Silva Costa
AU - Marco Shizuo Owatari
AU - Aline Brum Figueredo Ruschel
AU - Vinicius Ronzani Cerqueira
AU - Caio Magnotti
PY - 2026
DA - 2026/09/01
JO - Fishes
DO - 10.3390/fishes11100564
UR - https://doi.org/10.3390/fishes11100564
AB - The use of residual biomass from industrial seaweed processing in aquafeeds may represent a potential route for the reuse of residual biomass within a circular-economy framework. This proof-of-concept trial evaluated the effects of dietary supplementation with wet solid residue from the seaweed Kappaphycus alvarezii in Mugil liza over 80 days under a mixed-feeding system. The treatments comprised nominal wet-residue levels corresponding to 0, 6, 12, 18, 24 and 30% of the reference daily feed intake, equivalent to 0, 0.7, 1.5, 2.2, 2.9 and 3.5% of the dietary mixture on a dry-matter basis, respectively. No mortality occurred, indicating no detectable adverse effects under the tested conditions. Haematological data indicated a pattern consistent with hormesis, with the 6% and 12% nominal wet-residue levels associated with increased erythropoietic responses. Intestinal integrity and fillet nutritional quality were preserved; however, eviscerated yield showed numerical variation among treatments, with the lowest median value observed at 18%. The mixed-feeding strategy allowed a reduction in commercial feed input without compromising growth. Overall, the tested nominal wet-residue levels, corresponding to 0.7–3.5% of the dietary mixture on a dry-matter basis, were not associated with detectable impairment of survival, intestinal integrity or fillet quality. Future studies should employ randomized designs with replicated experimental units to further explore the potential of using K. alvarezii processing residue as a partial replacement for traditional feed components in M. liza production.
SN - 2410-3888
ER -