Person:
Fuente Vázquez, Jesús De La

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First Name
Jesús De La
Last Name
Fuente Vázquez
URI
https://hdl.handle.net/20.500.14352/80608
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Veterinaria
Department
Producción Animal
Area
Producción Animal
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2021 - 20242
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Author: Bermejo Poza, Rubén × Subject: 636.09 ×

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Now showing 1 - 2 of 2
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    Effect of ice stunning versus electronarcosis on stress response and flesh quality of rainbow trout
    (Aquaculture, 2021) Bermejo Poza, Rubén; Fuente Vázquez, Jesús De La; González De Chávarri Echániz, Elisabeth; Díaz Díaz Chirón, María Teresa; Fernández-Muela Garrote, Montserrat; Pérez, Concepción; Torrent, Fernando; Villarroel, Morris; Fuente Vázquez, Jesús De La
    In recent years, concerns about fish welfare have increased in aquaculture, most pointedly regarding the slaughter process. Immersion in ice water (live chilling) is still commonly used as a stunning method in salmonids, but can have negative effects on the stress response and flesh quality. A valid alternative is electronarcosis, but the specific details of the intensity and frequency of the current applied depend on the species and size, and little is known about how that may affect fish welfare or product quality. In this study, adult rainbow trout (294 ± 8.44 g average weight) were subjected to three different stunning methods before slaughter: immersion in ice water and electronarcosis at two different current intensities (200 or 400 mA). Electronarcosis caused fish to lose consciousness faster than those live chilled. Plasma concentration of cortisol was lower in fish stunned with 400 mA (400 mA: 5.2 ± 0.67 vs. Ice: 9.1 ± 0.90; 200 mA: 9.3 ± 1.20 ng/ml). Creatine-phosphokinase enzyme levels were higher in ice stunned fish compared to electronarcosis (Ice: 168 ± 2.32 vs. 200 mA: 114 ± 0.89; 400 mA: 104 ± 0.62 U/l). Regarding flesh quality, initial muscle pH was lower in fish stunned by ice immersion than by electronarcosis (Ice: 6.49 ± 0.034 vs. 200 mA: 6.76 ± 0.050; 400 mA: 6.61 ± 0.04), presenting also an earlier onset of rigor mortis. Fish stunned with 400 mA electronarcosis also presented higher levels of muscle glycogen than those stunned with ice water (0.181 ± 0.029 vs. 0.101 ± 0.013 mg/g). In conclusion, electronarcosis is a stunning method that can produce an immediate loss of consciousness in rainbow trout, reducing stress response before slaughter and improving flesh quality (with higher benefits using a current intensity of 400 mA), in contrast to immersion in ice water.
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    Environmental enrichment improves growthandfillet quality in rainbow trout
    (Journal of the Science of Food and Agriculture, 2024) De la Llave-Propín, Alvaro; Martínez Villalba, Andrea; Villarroel, Morris; Pérez Marcos, Concepción; González De Chávarri Echániz, Elisabeth; Díaz Díaz Chirón, María Teresa; Cabezas Albéniz, Almudena; González Garoz, Roberto; Fuente Vázquez, Jesús De La; Bermejo Poza, Rubén
    Background: Some environmental enrichment methods, such as occupational enrichment (OE), can improve fish growth, but little is known about its effects on fillet quality. In this study, we evaluated the effects of OE using underwater currents on different aspects of fillet quality and muscle metabolism in rainbow trout (Oncorhynchus mykiss), before and after a handling procedure (fasting). The trout were placed in groups of 30 in separate tanks in three treatments for 30 days: no artificial currents (CON), randomly fired underwater currents (RFC), and continuous underwater currents (CUC). Additionally, half of the individuals in each treatment were fasted (5 days, 45.2 °C days). Results: Slaughter weight, condition factor, and relative growth were lower in CON fish, indicating a positive effect of OE on growth. Rigor mortis, muscle pH, and muscle glycogen levels were similar among treatments, indicating no effect of OE on classical measures of fillet quality. However, significant differences were found regarding fillet colour and muscle enzymes. The fillets of RFC fish were more salmon-pink in colour, which is favoured by consumers. Also, activity levels of pyruvate kinase and glycogen phosphorylase in muscle were significantly higher in CUC fish, probably due to increased energy demands, as pumps were on continually in that treatment. Conclusion: Overall, RFC fish seemed to have received enough stimulation to improve growth while not being excessive in terms of exhausting the animals (avoiding negative effects on muscle metabolism), whereas OE may have provided a hormetic effect, allowing fish to better adjust to fasting. © 2023 Society of Chemical Industry.