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Open AccessArticle

Influence of Age on Stress Responses of White Seabream to Amyloodiniosis

1
IPMA-Portuguese Institute for the Ocean and Atmosphere, EPPO-Aquaculture Research Station, 8700-305 Olhão, Portugal
2
CCMAR, Centre of Marine Sciences, University of Algarve, 8005-139 Faro, Portugal
*
Author to whom correspondence should be addressed.
Fishes 2019, 4(2), 26; https://doi.org/10.3390/fishes4020026
Received: 24 February 2019 / Revised: 3 April 2019 / Accepted: 4 April 2019 / Published: 8 April 2019
(This article belongs to the Special Issue Welfare of Cultured and Experimental Fishes)
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. View Full-Text
Keywords: aquaculture; Amyloodinium ocellatum; age; physiological response; hematology; histopathology; welfare aquaculture; Amyloodinium ocellatum; age; physiological response; hematology; histopathology; welfare
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Moreira, M.; Cordeiro-Silva, A.; Barata, M.; Pousão-Ferreira, P.; Soares, F. Influence of Age on Stress Responses of White Seabream to Amyloodiniosis. Fishes 2019, 4, 26.

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