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Publication
Avaliar o impacto de duas temperaturas em biomarcadores de crescimento e de stress no cultivo de corvina-legítima (Argyrosomus regius (Asso, 1801))
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Abstract(s)
A corvina legítima, Argyrosomus regius, é um peixe teleósteo pertencente à família
Sciaenidae e à ordem Perciformes. Esta espécie tem potencial para a produção em larga
escala porque possui várias características positivas, como a fácil adaptação às condições
de cativeiro, crescimento rápido, boa conversão alimentar, elevado valor nutricional e
uma boa aceitação por parte do consumidor. A temperatura da água é um dos principais
fatores que exerce influência na atividade metabólica e fisiológica dos peixes porque são
animais que não conseguem regular a temperatura corporal. Essa influência pode afetar
o apetite, crescimento, desenvolvimento e reprodução dos peixes. Em aquacultura, a
temperatura para o cultivo da espécie pode estar entre os 22 e os 25ºC. O objetivo deste
estudo foi avaliar o impacto de duas temperaturas da água na sobrevivência,
desenvolvimento e crescimento de juvenis de corvina. Para isso, durante um período de
45 dias foram estudados 1800 juvenis de corvina nas instalações da Estação Piloto de
Piscicultura de Olhão. Fez-se uma distribuição aleatória dos indivíduos, onde dois
triplicados homogéneos de juvenis foram colocados em seis tanques de fibra de vidro
com um volume de 300L, cuja densidade não ultrapassou os 1,49 kg/m3. Um desses
triplicados com temperatura de 24ºC e os outros com temperatura de 28ºC. Para além
das 3 amostragens biométricas realizadas no decorrer do ensaio, na amostragem final
foram também recolhidas amostras de fígado para avaliar a atividade das enzimas do
stress oxidativo nos peixes cultivados às duas temperaturas. Os resultados mostram que
na temperatura de 28ºC os resultados da performance de crescimento foi
significativamente melhor do que na temperatura de 24ºC. Os resultados obtidos para a
atividade das enzimas de stress oxidativo sugerem que não há alterações entre os dois
tratamentos, indicando que o aumento da temperatura não se traduz num aumento do
stress oxidativo nos animais. No entanto, sugere-se a realização de mais analítica para
confirmar estes resultados. Os resultados obtidos neste estudo são bastante relevantes
para o setor da aquacultura na medida em que comprovam que, para além da temperatura
de 24ºC ser ajustada à produção desta espécie, a temperatura de 28ºC consegue ser ainda
mais promissora, tendo apresentado melhores resultados na produção de juvenis de A.
regius.
The meagre, Argyrosomus regius is a teleost fish (family Sciaenidae and order Perciformes). This species has the potential for large-scale production because it has several positive characteristics, such as easy adaptation to captive conditions, rapid growth, good feed conversion, high nutritional value, and good consumer acceptance. Water temperature is one of the main factors that influences the metabolic and physiological activity of fish because they are animals that cannot regulate their body temperature. This influence can affect the appetite, growth, development, and reproduction of fish. In aquaculture, the temperature for this species can be between 22 and 25ºC. The aim of this study was to evaluate the impact of two water temperatures on the survival, development, and growth of juvenile meagre. During a period of 45 days, 1800 juvenile were studied in the facilities of Estação Piloto de Piscicultura de Olhão. A random distribution of individuals was carried out, where three homogeneous groups of juveniles were placed in six fiberglass tanks with a volume of 300L, whose density did not exceed 1.49 kg/m-3, three of these groups with a temperature of 24ºC and the other three with a temperature of 28ºC. In addition to the biometric sampling carried out during the trial, in the final sampling, liver samples were also collected to predict the oxidative stress enzymes activity in fish, at both temperatures. The results show that at 28ºC the growth performance results were significantly better than at 24ºC. The results obtained for the activity of oxidative stress enzymes suggest the increase in temperature does not increase the oxidative stress in the animals. However, further analysis is suggested to confirm these results. The results obtained in this study are relevant for the aquaculture sector as they prove that, in addition to the temperature of 24ºC being adjusted to the production of this species, the temperature of 28ºC can be even
The meagre, Argyrosomus regius is a teleost fish (family Sciaenidae and order Perciformes). This species has the potential for large-scale production because it has several positive characteristics, such as easy adaptation to captive conditions, rapid growth, good feed conversion, high nutritional value, and good consumer acceptance. Water temperature is one of the main factors that influences the metabolic and physiological activity of fish because they are animals that cannot regulate their body temperature. This influence can affect the appetite, growth, development, and reproduction of fish. In aquaculture, the temperature for this species can be between 22 and 25ºC. The aim of this study was to evaluate the impact of two water temperatures on the survival, development, and growth of juvenile meagre. During a period of 45 days, 1800 juvenile were studied in the facilities of Estação Piloto de Piscicultura de Olhão. A random distribution of individuals was carried out, where three homogeneous groups of juveniles were placed in six fiberglass tanks with a volume of 300L, whose density did not exceed 1.49 kg/m-3, three of these groups with a temperature of 24ºC and the other three with a temperature of 28ºC. In addition to the biometric sampling carried out during the trial, in the final sampling, liver samples were also collected to predict the oxidative stress enzymes activity in fish, at both temperatures. The results show that at 28ºC the growth performance results were significantly better than at 24ºC. The results obtained for the activity of oxidative stress enzymes suggest the increase in temperature does not increase the oxidative stress in the animals. However, further analysis is suggested to confirm these results. The results obtained in this study are relevant for the aquaculture sector as they prove that, in addition to the temperature of 24ºC being adjusted to the production of this species, the temperature of 28ºC can be even
Description
Keywords
Argyrosomus regius Corvina-legítima Temperatura Crescimento Stress oxidativo