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Morphological changes, peptidase activity, and effects of exogenous enzymes in the early ontogeny of Nile tilapia, Oreochromis niloticus

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Abstract

During the early ontogeny, the transition from endogenous (yolk protein) to exogenous feeding (artificial diets) represents a critical period linked to the undifferentiated digestive system, with low digestibility of food protein. The objectives of this work were to characterize the morphology of the early Nile tilapia (Oreochromis niloticus) developmental stages and determine the activity of alkaline and acid peptidase enzymes during the ontogenesis from hatching to 20 days post-hatching (DPH). Also, the in vitro effect that exogenous enzymes from Argentine red shrimp (Pleoticus muelleri) waste have on the alkaline peptidases of larvae from 6 to 20 DPH (which correspond to the age at which fish eat exogenous food) was studied. Both acid and alkaline peptidase activities varied throughout early ontogeny development (from 0.1 to 1, and from 0.1 to 7.1 UE mg protein−1, respectively). The patterns of both enzyme activity variation would be related with changes in endogenous, mixed and exogenous feeding. Our studies show that the additions of the enzyme extract of shrimp have a synergistic effect (from 3 to 6 times) on endogenous in vitro activity. Moreover, the zymogram analysis demonstrates that the bands corresponding to the activity of each species (tilapia and red shrimp) remain active when they are mixed. The increase in peptidase digestive capacity by addition of exogenous enzymes would maximize the assimilation of nutrients from artificial food during early development.

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Acknowledgements

We are grateful to Paula Waldman, Federico Cecchi, Arturo Assain, and Brian Tomaselli from the Laboratory of Aquaculture (UTN-FRMdP, Mar del Plata) for assisting during fish reproduction, rearing and sampling. We want to thank to Graciela Alvarez from the Laboratory of Histology (IIMyC, Mar del Plata) for helping during fish measures and photo. Also, we are grateful to the Universidad Nacional de Mar del Plata for funding this research (EXA 865-18; 874-18 and 875-18 projects). We thank Professor Julieta Santos for the revision of English grammar and syntax.

Funding

This work was supported by Universidad Nacional de Mar del Plata (EXA 865–18; 874–18 and 875–18 projects).

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del Valle, J.C.: conceptualization, supervision, methodology, investigation, validation, formal analysis, writing — original draft preparation, and visualization. Zanazzi, A.N.: resources, methodology, reviewing, and editing. Rodriguez, Y.E.: methodology, investigation, formal analysis, and writing — reviewing and editing. Haran, N.S.: methodology, investigation, formal analysis, and original draft preparation. Laitano, M.V.: investigation, formal analysis, reviewing, and editing. Mallo, J.C.: resources, methodology, reviewing, and editing. Fernández-Gimenez, A.V.: conceptualization, supervision, methodology, investigation, validation, formal analysis, writing — original draft preparation, and visualization.

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Correspondence to Juana Cristina del Valle.

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The care and use of experimental animals complied with “Institutional Committee for the Care and Use of Experimental Animals” animal welfare laws, guidelines, and policies as approved by FCEyN-UNMdP (RD 395–19).

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The authors declare no competing interests.

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Handling Editor: Gavin Burnell

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del Valle, J.C., Zanazzi, A.N., Rodriguez, Y.E. et al. Morphological changes, peptidase activity, and effects of exogenous enzymes in the early ontogeny of Nile tilapia, Oreochromis niloticus. Aquacult Int 30, 1645–1658 (2022). https://doi.org/10.1007/s10499-022-00932-5

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  • DOI: https://doi.org/10.1007/s10499-022-00932-5

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