The Pathology and Blood Biochemistry of Juvenile Lates calcarifer on Diets Contaminated With Mycotoxins, Histamines and Rancid Fats-A Case Study.

Autor: Kwok A; James Cook University Singapore, Singapore City, Singapore., Domingos JA; James Cook University Singapore, Singapore City, Singapore.; Tropical Futures Institute, James Cook University, Singapore City, Singapore., Oh J; James Cook University Singapore, Singapore City, Singapore.; Tropical Futures Institute, James Cook University, Singapore City, Singapore., Chan P; Asian School of the Environment, Nanyang Technological University, Singapore City, Singapore., Ong JJL; Asian School of the Environment, Nanyang Technological University, Singapore City, Singapore., Nankervis L; Centre for Sustainable Tropical Fisheries and Aquaculture, College of Science and Engineering, James Cook University, Townsville, Queensland, Australia., Ling J; James Cook University Singapore, Singapore City, Singapore., Nichol R; Innovad Asia Pacific PL, Singapore City, Singapore., Gibson-Kueh S; James Cook University Singapore, Singapore City, Singapore.; Tropical Futures Institute, James Cook University, Singapore City, Singapore.
Jazyk: angličtina
Zdroj: Journal of fish diseases [J Fish Dis] 2024 Oct 23, pp. e14034. Date of Electronic Publication: 2024 Oct 23.
DOI: 10.1111/jfd.14034
Abstrakt: Mycotoxins, originating from contaminated raw materials or suboptimal feed storage, are a growing concern in tropical aquaculture. Common fungi such as Aspergillus spp. and Fusarium spp. produce mycotoxins including aflatoxin, fumonisin, deoxynivalenol and zearalenone. High doses or prolonged exposure (weeks) to low doses of these mycotoxins (< 20 μg/kg) can depress growth, immunity, and cause mortality. This study investigated poor growth and low survival in juvenile Asian seabass, Lates calcarifer fed two different diets (FM40 and ABS3) for 5 weeks. Analysis of these diets revealed high peroxide values, multiple mycotoxins and high histamine levels. Fish fed the FM40 diet, which was contaminated with aflatoxin B1 (13.2 μg/kg), aflatoxin B2 (1.9 μg/kg), deoxynivalenol (29.5 μg/kg), alternariol (2.2 μg/kg), elevated peroxide value (45.91 mEq/kg), and histamine (129.51 mg/kg) developed mild bile duct hyperplasia, depressed total serum proteins (50.40 ± 10.06 g/L), markedly elevated blood potassium (8.2 ± 0.18 mmol/L), and heavy iron deposits in splenic melanomacrophage centres (Perl's stain) indicative of increased haemolysis. The presence of multiple cytotoxic mycotoxins in FM40 diet could explain the increased haemolysis and elevated blood potassium. In contrast, fish fed the ABS3 diet, which had high histamine levels (210.05 mg/kg), exhibited protein-losing nephropathy with multifocal fibrin plugs (Martius scarlet blue stain) indicating acute renal damage, and elevated blood calcium and phosphorus levels. Histamine is metabolised and excreted through the kidneys and known to induce renal arteriolar constriction, disrupt glomerular filtration barrier and increase permeability resulting in protein loss. This study shows that blood biochemistry and histopathology are useful diagnostic tools for assessing the impact of mycotoxins and histamines on fish health.
(© 2024 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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