Document of bibliographic reference 392677

BibliographicReference record

Type

Bibliographic resource

Type of document

Book/Monograph

Type of document

Dissertation

BibLvlCode

M

Title

Efecto de altas temperaturas de aclimatación sobre el crecimiento, tasa metabólica y tolerancia térmica en alevinos de tilapia (Oreochromis sp.)

Abstract

Temperature has a direct effect on the well-being of poikilothermic organisms, so global warming in the coming years will generate significant thermal stress in these organisms. As a consequence, more tolerant species will have a competitive advantage by better withstanding these episodes. Tilapia (Oreochromis sp.) is an invasive exotic species characterized by its adaptive capabilities to diverse aquatic ecosystems. In Peru and other countries, it is reported as an introduced species in inland waters that competes for space and resources with local species. The objective of this study is to determine the effect of thermal variation on the physiological responses of tilapia fry, and thereby understand their role within the newly impacted ecosystems. In this study, 270 tilapia fingerlings were randomly distributed into 9 experimental units (3 treatments with 3 replicates), where they were exposed to 3 contrasting temperatures (T1 = 26 °C, T2 = 30 °C y T3 = 34 °C) for 34 days. Total length (6.78, 6.91 and 7.2 cm for T1, T2 and T3, respectively), wet weight (5.05, 5.38 and 6.05 g for T1, T2 and T3, respectively), SGR (1.98, 2.21 and 2.53 %g/day for T1, T2 and T3, respectively) and percentage of weight gain (95.8, 111.9 and 136.4 % for T1, T2 and T3, respectively) evidenced the positive influence of exposure temperature, while TGC (0.39 on average) and the condition factor (1.53 on average) remained statistically unchanged in the 3 treatments. The metabolic rate increased with acclimation temperature (277.9, 294.2 and 327.4 mg0₂ kg^-1 h^-1 for T1, T2 and T3, respectively). Likewise, thermal tolerance also increased with acclimation temperature, reaching the maximum tolerance (43.1 °C) at 34 °C. With these results, it is concluded that tilapia fry has the physiological capacity to withstand and cope well with high levels of stress caused by exposure to high environmental temperatures

Bibliographic citation

Santillan Crisolo, E.T. (2024). Efecto de altas temperaturas de aclimatación sobre el crecimiento, tasa metabólica y tolerancia térmica en alevinos de tilapia (Oreochromis sp.). BA Thesis. Universidad Nacional Mayor de San Marcos: Lima. 70 pp.

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open access

Is accessible for free

true