Survival of Pteria sterna (Gould, 1851) exposed to low salinities

Authors

  • Vanessa Hanoi Acosta de Matheus Grupo de Investigación en Biodiversidad y Ecología de Ecosistemas Acuáticos. Dpto. Acuicultura, Pesca y Recursos Naturales Renovables, Facultad de Ciencias Veterinarias, Universidad Técnica de Manabí, Ecuador. http://orcid.org/0000-0002-1631-7462
  • Julian Francisco Alvarez Maestría de Investigación en Acuicultura, Instituto de Posgrado, Universidad Técnica de Manabí, Portoviejo, Ecuador. Grupo de Investigación en Biodiversidad y Ecología de Ecosistemas Acuáticos. Dpto. Acuicultura, Pesca y Recursos Naturales Renovables, Facultad de Ciencias Veterinarias, Universidad Técnica de Manabí, Ecuador. http://orcid.org/0000-0002-5251-6717
  • Luis Manuel Treviño Grupo de Investigación en Biología y Cultivo de Moluscos, Dpto. de Acuicultura y Pesca, Facultad de Ciencias Veterinarias, Universidad Técnica de Manabí, Ecuador. http://orcid.org/0000-0002-7955-6161

DOI:

https://doi.org/10.33936/la_tecnica.v0i0.3028

Keywords:

estuary, oyster, euryhaline, culture

Abstract

The lower basin of the Chone river estuary constitutes an environment with high feasibility for the cultivation of Pteria sterna, however, salinity represents a limiting ecological factor for the development of this activity, particularly during the rainy season. The present study was designed to determine the tolerance of P. sterna exposed to low salinities, by quantifying survival during 96h. 20 aquariums were used, with 20 L of salt water (30 UPS), where 10 oysters were randomly distributed (40 ± 2.05 mm) in four treatments in triplicate: T1 (25 UPS), T2 (20 UPS), T3 (15 UPS), T4 (10 UPS) and Control Group (30 UPS). The experimental salinities were obtained in a time of 6h/10min, achieving acclimatization without mortality. In each treatment and control group, survival was estimated by counting all living organisms. The determination of the LC50 was carried out by means of a Probit regression. The survival percentage of P. sterna showed significant differences (P<0.05) between the treatments and the control group, observing that the oysters exposed to T3 and T4 did not survive after 24 and 48 h. In T2, survival remained constant from 72h (50%), while in T1, it remained at 90% during 96h. The CG did not register mortality. The median lethal salinity (LC50) is located at 20.13 UPS. P. sterna can be considered an osmoregulatory and euryhaline species, a bioecological characteristic, which allows it to be cultivated in the estuary of the Chone river, during the dry season, where the salinity is not less than 20 UPS.

Keywords: estuary; oyster; euryhaline; culture

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References

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Published

2021-08-31

How to Cite

[1]
Acosta de Matheus, V.H., Alvarez, J.F. and Treviño, L.M. 2021. Survival of Pteria sterna (Gould, 1851) exposed to low salinities. La Técnica. Revista de las Agrociencias. ISSN 2477-8982. (Aug. 2021), 1–15. DOI:https://doi.org/10.33936/la_tecnica.v0i0.3028.

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Section

Acuicultura y Pesca