Aeromonas hydrophila in tilapia (Oreochromis niloticus) after the intake of aflatoxins

Abstract

) e um grupo controle com ração sem aflatoxina, em um delineamento inteiramente randomizado com quatro tratamentos e cinco repetições. No segundo ensaio, utilizou-se um grupo controle que recebeu ração livre de aflatoxina, o qual foi inoculado com solução salina (grupo 1) e Aeromonas hydrophila (grupo 2), bem como grupos de animais que receberam ração contendo 0,350 mg.kg feed -1 de aflatoxina (grupo 3); 0,757 mg.kg feed -1 de aflatoxina (grupo 4); e 1,177 mg.kg ração -1 de aflatoxina (grupo 5), sendo estes grupos inoculados com Aeromonas hydrophila. A sobrevivência e o comprimento total dos alevinos foram influenciados pelos tratamentos (p < 0,05). A ação sinérgica de aflatoxinas e Aeromonas hydrophila mostrou-se eficaz ao provocar a morte dos alevinos e influenciar a conversão alimentar e comprimento. PALAVRAS-CHAVE:peixe; micotoxina; patógeno oportunista. ABSTRACT:The objectives of this study were to assess the effect of the intake of aflatoxin on the development of tilapia and to evaluate the impact of inoculation with Aeromonas hydrophila on performance parameters, so these two individual tests were performed. One hundred and twenty fingerlings aged 35 days old, with mean weight of 1.55 ± 0.005 g and mean length of 5 cm were used in each test, distributed in 20 tanks. Each experimental unit consisted of a 60 L tank with six fingerlings. In the first experiment, increasing levels of aflatoxin (0.350, 0.757, 1.177 mg.kg feed -1 ) were used as treatments and, for the control group, a diet without aflatoxin was used in a completely randomized design with four treatments and five replicates. In the second experiment, a control group of Nile tilapia fingerlings was used and received a diet without aflatoxin, inoculated with saline solution (group 1) and Aeromonas hydrophila (group 2), as well as groups of animals fed on diets containing 0.350 mg.kg feed -1 of aflatoxin (group 3), 0.757 mg.kg feed -1 of aflatoxin (group 4) and 1.177 mg.kg feed -1 of aflatoxin (group 5), and these groups were inoculated with Aeromonas hydrophila. The survival rate and the total length of fingerlings were influenced by the treatments (p < 0.05). The synergistic action of aflatoxins and Aeromonas hydrophila was effective and caused the death of experimental fish, thus affecting feed conversion and length.

Occurrence of mycotoxins in commercial aquafeeds in Asia and Europe: a real risk to aquaculture?

“…For tropical species, growth rate and FCR of Nile tilapia were reported to be significantly affected by AF on the feed. Values ranging from 100 to 2500 lg kg À1 of AFB significantly affected growth performance in tilapia (El-Banna et al 1992;Ch avez-S anchez et al 1994;Tuan et al 2003;Oliveira et al 2013). It was also shown by El-Banna et al (1992) that at lower concentrations of AF in the diets (50 lg kg À1 of AFB), vacuolization and necrosis of hepatocytes were observed.…”

ANALISIS TOTAL BAKTERI Aeromonas sp. PADA IKAN NILA (Oreochromis niloticus) DI WILAYAH KERAMBA JARING APUNG (KJA) DAN NON-KJA RAWA PENING

“…Menurut Oliveira et al (2013), inang yang lemah dapat menyebabkan terkaitnya patogenitas akibat Aeromonas sp. sehingga menyebabkan penyakit.…”

Efeitos da exposição crônica a aflatoxinas na dieta em peixes Pacu (>i<Piaractus mesopotamicus>/i<)

“…Alguns relatos de contaminações são apresentados, como a farinha de semente de algodão com aflatoxinas associada a um surto de aflatoxicose em peixes truta arco-íris (Oncorhynchus mykiss) na década de 60 (KUMAR et al, 2013;WOLF;JACKSON, 1963). Várias espécies de peixes, tais como robalo, (Dicentrarchus labrax L.), truta arco-íris (Oncorhynchus mykiss), dourada (Sparus aurata), híbrido juvenil esturjão (Acipenser ruthenus x A. baeri), tilápia do Nilo (Oreochromis niloticus), carpa de gibel (Carassius auratus gibelio) e bagre do canal (Ictalurus punctatus) foram envolvidos em pesquisas sobre a toxicidade das AFB1 (CENTODUCATI et al, 2009; CHÁVEZ-SÁNCHEZ; PALÁCIOS; MORENO, 1994;EL-BANNA et al, 1992;EL-SAYED;KHALIL, 2009;HENDRICKS et al, 1993;HUANG et al, 2011;JANTRAROTAI;LOVELL, 1990;OLIVEIRA et al, 2013;RAJEEV RAGHAVAN et al 2011;TUAN et al, 2002).…”