Oliveira, B.L. (2020). Resposta fisiológica do dentão (Lutjanus jocu) durante o transporte e sob condições diferentes de cultivo. [Physiological response of the dog snapper (Lutjanus jocu) during transport and under different cultivation conditions.]. Tese de Doutorado, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil. 81 pp. [In Portuguese and English].

485530

Oliveira, B.L.

2020

81 pp. [In Portuguese and English]

Publication

Available for editors   [request]

The development of marine fish farming, through fish with economic value, has become a fundamental initiative in the preservation of fish stocks, and has been increasing progressively in recent years. There is a lack of scientific information regarding the generation of necessary data, so that more specific and scientifically based protocols can be safely established. Blood analysis can become a fast, nonlethal and low-cost tool for the early detection of situations of malnutrition, stress and infection in fish, where the lack of hematological reference values and biochemical parameters in healthy animals has limited its application. The procedures for capturing, handling and transporting fish can cause several changes, bringing suppressive effects on growth, reproduction and immunity, and even mortality. Aiming to fill this information gap, by choosing a species of native marine fish not yet available in any literature, this thesis is composed of five chapters: the first chapter characterized and evaluated the effect of handling and transporting dog snapper (Lutjanus jocu) under anesthesia and in its absence, with measurements of stress prior to transport, after the arrival of the organisms in the laboratory and 24 hours after (recovery), through hematological and biochemical responses. The second chapter had as objective to describe the first record of Neobenedenia melleni in dog snapper (Lutjanus jocu) in the western South Atlantic, where procedures have also been suggested to eliminate this parasite in fish grown in the laboratory. The third chapter sought to evaluate the condition and immune response through biochemical and hematological parameters in dog snapper (Lutjanus jocu) cultivated in a fish cage, later in the laboratory, with the infestation by Neobenedenia melleni, and after the treatment with fresh water bath and injectable application of levamisole. The fourth chapter documented the first record of Caligus asperimanus Pearse, 1951 in the Western South Atlantic parasitizing Lutjanus jocu and Lutjanus vivanus captured in the coastal areas of Espírito Santo and Rio de Janeiro, respectively. Finally, the fifth chapter aimed to assess the influence of salinity (0-30) on biochemical and hematological parameters in juveniles of Lutjanus jocu. The results presented are unprecedented, presenting L. jocu as a promising species for cultivation from the point of view of rusticity, ease of handling, resistance to parasitic infestations (with the first record of N. melleni and C. asperimanus parasitizing L. jocu in Western South Atlantic) and adaptation to low salinity cultivation, opening up the prospect for the dog snapper to be cultivated from continental, estuarine waters and even in large offshore cages. Key words: Lutjanus jocu, aquaculture, biochemistry, hematology, stress, parasitism.

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