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Changes in digestive enzyme activities during the early ontogeny of the South American cichlid (Cichlasoma dimerus)

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Abstract

Cichlasoma dimerus is a neotropical cichlid that has been used as a biological model for neuroendocrinology studies. However, its culture is problematic in terms of larval feeding to allow having enough fry quantity and quality. Larviculture requires full knowledge about the digestive system and nutrition; therefore, this study was intended to assess the digestive enzymes' changes at different ages during the early ontogeny. Acid protease activity was detectable from the first day after hatching (dah), increasing to its maximum peaks on 9 dah. In contrast, alkaline proteases had low activity in the first days of life but reached their maximum activity on 17 dah. Chymotrypsin, L-aminopeptidase, and carboxypeptidase A activities increased at 6 dah, while trypsin activity was first detected on 13 dah and reached its maximum activity on 17 dah. Lipase and α-amylase activity were detectable at low levels in the first days of life, but the activity fluctuated and reaching its maximum activity at 21 dah. Alkaline phosphatase continued to oscillate and had two maximum activity peaks, the first at 6 dah and the second at 19 dah. Zymograms of alkaline proteases on day 6 dah six revealed four activity bands with molecular weights from 16.1 to 77.7 kDa. On 13 dah, two more activity bands of 24.4 and 121.9 kDa were detected, having a total of six proteases. The enzymatic activity analyzes indicate the digestive system shows the low activity of some enzymes in the first days after hatching, registering significant increases on 6 dah and the maximum peaks of activities around at 17 dah. Therefore, we recommend replacing live food with dry feed and only providing dry feed after day 17 dah.

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Acknowledgements

F.J T-S. acknowledges the National Council for Science and Technology (CONACYT, Mexico) for the post-doctoral fellowship No. 2019-000012-01EXTV-00292. This work was carried out with the collaboration of Red CYTED LARVAplus (117RT0521). Authors thanks Dr. Warren Burggren from University of North Texas for the professional native English-speaking review.

Funding

This research was supported by Universidad de Buenos Aires (grant number: 20020160100110BA to PV), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (PIP 2014–2016:11220130100501CO to PV).

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Francisco Javier Toledo-Solís, Andrea Guadalupe Hilerio-Ruiz, Tomás Delgadin and Daniela Pérez Sirkin. The first draft of the manuscript was written by Francisco Javier Toledo-Solís, Emyr Saul Peña-Marín, Rafael Martínez-García, Claudia Ivette Maytorena-Verdugo, María Paula Di Yorio, Paula Gabriela Vissio, Carlos Alfonso Álvarez-González and Miguel Angel Sáenz de Rodrigáñez and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Carlos Alfonso Álvarez-González.

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Principles of laboratory animal care (NIH Guide for the Care and Use of Laboratory Animals [1996 (7th edition) Washington, DC: National Academy Press, aka National Research Council Guide] were followed.

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The authors declare no competing interests.

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Toledo-Solís, F.J., Hilerio-Ruiz, A.G., Delgadin, T. et al. Changes in digestive enzyme activities during the early ontogeny of the South American cichlid (Cichlasoma dimerus). Fish Physiol Biochem 47, 1211–1227 (2021). https://doi.org/10.1007/s10695-021-00976-z

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  • DOI: https://doi.org/10.1007/s10695-021-00976-z

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