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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03606

    Histological assessment of systemic granulomatosis progression in meagre Argyrosomus regius during cage ongrowing phase

    Andrea Gustinelli*, Slavica Čolak, Francesco Quaglio, Rubina Sirri, Matko Kolega, Danijel Mejdandžić, Monica Caffara, Renata Baric, Maria Letizia Fioravanti

    *Corresponding author:

    ABSTRACT: Meagre Argyrosomus regius is a potential candidate for Mediterranean aquaculture diversification, although several health issues still represent important bottlenecks for its sustainable production, including systemic granulomatosis (SG). To evaluate the SG progression in meagre during a 10 mo period of cage ongrowing, a histopathological investigation was carried out on 108 meagre fed 3 different diets (commercial pellet, hydrated commercial pellet and defrosted sardines). Histological sections of gills and visceral organs were examined and lesions referable to SG scored from 1 to 3 according to the severity of the granulomatosis. The kidney and the liver were the most affected organs, showing highest percentage of positivity for granulomas and severity of the lesions along the whole observation period. By statistical analysis, an effect of diet and temperature was found using a statistical mixed model (GLMM) followed by odds ratio analysis: the severity of liver and digestive tract SG scores decreased in the Cage 3 group (defrosted sardines), and with the increasing of temperature (p < 0.05, negative estimates, and odds ratio <1). These observations, in accordance with literature, suggest that SG in meagre could be related to nutritional-metabolic factors with the possible influence of environmental factors such as temperature.