Bibliographic citations
Pillaca, R., (2023). Efecto del hidrolizado de subproductos del langostino (Litopenaeus vannamei) sobre el estrés de juveniles de tilapia de nilo (Oreochromis niloticus) [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/6095
Pillaca, R., Efecto del hidrolizado de subproductos del langostino (Litopenaeus vannamei) sobre el estrés de juveniles de tilapia de nilo (Oreochromis niloticus) []. PE: Universidad Nacional Agraria La Molina; 2023. https://hdl.handle.net/20.500.12996/6095
@misc{renati/1116430,
title = "Efecto del hidrolizado de subproductos del langostino (Litopenaeus vannamei) sobre el estrés de juveniles de tilapia de nilo (Oreochromis niloticus)",
author = "Pillaca Llamocca, Roxana",
publisher = "Universidad Nacional Agraria La Molina",
year = "2023"
}
The increase of stocking densities in intensive culture is considered as one of the main factors that elevate stress levels in fish affecting their growth. The study was conducted to evaluate the intake effect of the inclusion of shrimp by-products hydrolyzed (HSL) as a replacement of fishmeal in juvenile Nile tilapia (Oreochromis niloticus) over density stress. Productive parameters, physiological condition through hematological parameters and serum cortisol, and superoxide dismutase (SOD) enzyme activity were evaluated. 120 tilapia juveniles 18.74 g ± 0.11 were distributed in six aquaria (50-L) in a recirculation aquaculture system (RAS) with an initial density stocking of 7.2 kg/m3. Two treatments were applied: TC, with fishmeal inclusion and T-HSL, with 100% fishmeal replacement by HSL. The feeding trial was performing for 30 days. The results showed that T-HSL had lower performance (P < 0.05) regarding productive parameters compared to TC, however a lower survival rate was observed in this treatment. The serum cortisol in TC was lower (P < 0.05) than T-HSL, 5.40 and 10.28 ng/ml, respectively. No significant differences (P > 0.05) were observed in hematological parameters between treatments, being the values for erythrocyte count (1.7 x106; 1. 8 x106 cells/ µl), haematocrit (27.89; 32.94%), haemoglobin (6.03; 6.88 g/dl), Mean Corpuscular Volume (MCV) (190.86; 248.49 fl), Mean Corpuscular Haemoglobin (MCH) (40.52; 46.17 pg) and Mean Corpuscular Haemoglobin Concentration (MCHC) (22.04; 21.16 g/dl) for CT and T-HSL respectively. Finally, SOD activity was significantly (P < 0.05) increased in T-HSL (218.69 µ/ml) than TC (120.71 µ/ml). In conclusion, HSL shows a positive effect on stress caused by high stocking density on juvenile tilapia (Oreochromis niloticus) reflected in decreased mortality and fish welfare.
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