Abstract
Nutrition and the lack of an established protocol for the larviculture of Octopus are some of the bottlenecks for the development of Octopus aquaculture. This study aims to start filling in these knowledge gaps by obtaining daily feeding rates (FR) of Octopus americanus paralarvae at different ages by testing different live prey types (Artemia nauplii, Acartia lilljeborgii copepods, and Callinectes sapidus zoeae) and densities (20, 40, 60, 80, 120, and 160 prey L−1). In addition, prey preference was assessed by exposing paralarvae to these prey types simultaneously. The dry weight (DW) of the prey was obtained and used to estimate the daily DW ingestion rate of paralarvae. Experiments were performed with 1- and 8–9-day-old paralarvae. The FRs recorded for different prey densities and the effect of different prey types on prey preference were analyzed through one-way ANOVA. The FRs recorded were quite different among the preys tested. The highest mean FRs for hatchlings was 26.2±6.9 zoeae paralarva−1 day−1 and for 8-day-old paralarvae was 63–69 Artemia nauplii paralarva−1 day−1. Therefore, the following prey densities are recommended for the larviculture of paralarvae up to 10 days of age: 80 copepods L−1, 160 Artemia nauplii L−1, and 80 zoeae L−1. Hatchlings showed a significant preference for zoeae, and Artemia nauplii and zoeae were significantly more preyed by 8-day-old paralarvae. Our results demonstrated that increasing prey density increases FR and predation by paralarvae, and zoeae were by far the preferred prey of hatchlings.
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Acknowledgements
We thank the staffs of the Cephalopod Early-life Stages Laboratory and the Zooplankton Laboratory at Center of Marine Studies (UFPR), in special the Lab. technicians Paulo Soares and Vanessa Coquemala for their support during the experiments. We also thank Katina Roumbedakis for her valuable comments and suggestions. The authors are grateful to the Brazilian Ministry of Environment (MMA) and the Chico Mendes Institute for Conservation and Biodiversity for authorizing the capture and maintenance of octopuses for the experiments and the Coordination for Higher Education Improvement (CAPES) and the Araucária Foundation (Fundação de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná) for the scholarships provided for Danielle Ortiz and Ivan Gavioli, respectively. We thank the Brazilian National Research Council (CNPq) for grants to EAGV (# 426797/2018-5 and 312332/2018-1).
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The Coordination for Higher Education Improvement (CAPES), the Araucária Foundation (Fundação de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná), and the Brazilian National Research Council (CNPq) (grants to EAGV, # 426797/2018-5 and 312332/2018-1).
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Danielle Ortiz de Ortiz: conceptualization, methodology, validation, formal analysis, investigation, data curation, writing original draft, writing review and editing, and visualization. Ivan Luiz Gavioli: validation, formal analysis, investigation, data curation, and writing original draft. J. Guilherme Bersano Filho: conceptualization, methodology, and resources. Erica A G Vidal: conceptualization, methodology, validation, data curation, resources, writing review and editing, supervision, project administration, and funding acquisition.
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This study was conducted in accordance with the guidelines for the care and welfare of cephalopods (Fiorito et al. 2015) and the principles of the European Directive (2010/63/EU), which regulate cephalopod research in the European Union (E 121 U: Smith et al. 2013) and the recommendations of the ARRIVE Guideline (Kilkenny et al. 2010) for reporting in vivo experiments with research animals. The authors hold an authorization (number 61506-1) from the Brazilian Ministry of the Environment (MMA) to collect, transport, and maintain Octopus spp. for scientific purposes.
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de Ortiz, D.O., Gavioli, I.L., Bersano, J.G.F. et al. Feeding rates and prey preference in Octopus americanus paralarvae fed with different prey densities and types, Artemia, copepods, and zoeae. Aquacult Int 29, 779–800 (2021). https://doi.org/10.1007/s10499-021-00657-x
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DOI: https://doi.org/10.1007/s10499-021-00657-x