Seasonality of <i>Amyloodinium ocellatum</i> Brown 1931 (Dinophyceae) infesting the Senegalese sole <i>Solea senegalensis</i> from Bizerte lagoon, Tunisia

Yemmen, Chiraz; Bahri, Sihem

doi:10.1111/jfd.12551

Cited by 1 publication

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References 17 publications

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“…The histopathological analysis of the white seabream gills revealed an increase in some histopathological lesions, such as hyperplasia with vacuolization, lamellar fusion, and necrosis. This agrees with the lesions reported for several fish species such as cobia (Rachycentron canadum) [40], porkfish (Anisotremus virginicus) [45], gilthead seabream [42], yellowtail [43], Senegalese sole (Solea senegalensis) [46], meagre (Argyrosomus regius) [47], silver pompano (Trachinotus blochii) [48], and European sea bass [38] for infestation of A. ocellatum. However, there were some differences in the type of histopathological lesions over time.…”

Section: Discussionsupporting

confidence: 90%

Influence of Age on Stress Responses of White Seabream to Amyloodiniosis

Moreira

Cordeiro-Silva

Barata

et al. 2019

Fishes

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Amyloodiniosis is a disease that represents a major bottleneck for semi-intensive aquaculture, especially in Southern Europe. The inefficacy of many of the treatments for this disease on marine fish produced in semi-intensive aquaculture has led to a new welfare approach to amyloodiniosis. There is already some knowledge of several welfare issues that lead to amyloodiniosis as well as the stress, physiological, and immunological responses to the parasite by the host, but no work is available about the influence of fish age on the progression of amyloodiniosis. The objective of this work was to determine if stress, hematological, and histopathological responses are age dependent. For that purpose, we determined the mortality rate, histopathological lesions, hematological indexes, and stress responses (cortisol, glucose, lactate, and total protein) in “Small” (total weight: 50 ± 5.1 g, age: 273 days after eclosion (DAE)) and “Big” (total weight: 101.3 ± 10.4 g, age: 571 DAE) white seabream (Diplodus sargus) subjected to an Amyloodinium ocellatum infestation (8000 dinospores mL−1) during a 24-h period. The results demonstrated a strong stress response to A. ocellatum, with marked differences in histopathological alterations, glucose levels, and some hematological indexes between the fish of the two treatments. This work elucidates the need to take in account the size and age of the fish in the development and establishment of adequate mitigating measures and treatment protocols for amyloodiniosis.

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