Examinando por Materia "Abalone"

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    Ítem
    Modulation of systemic antioxidant and immune responses in red abalone (Haliotis rufescens) during the recovery phase of anesthesia, in preparation for grafting surgery
    (Elsevier, 2025) Rojas-Figueroa, Alejandro; Saucedo, Pedro E; Granados-Amores, Andres; Araya, Ruben; Correa-Reyes, Gabriel; Guardiola, Francisco A; Angulo, Carlos
    The use of anesthetic agents as pre-operatory treatment to pearl seeding surgery can be stressful to organisms and activate various physiological response mechanisms. This study evaluated some parameters of the systemic antioxidant and immune responses in red abalone (Haliotis rufescens) exposed to 0.25 mL L−1 eugenol (EUB), 3.0 mL L−1 phenoxyethanol (PEB) and CO2 at saturation, as well as in a control (CT) without anesthetic. Abalone were anesthetized for 45 min and, during the recovery stage, hemolymph samples were collected at 0.5, 1, 2 and 24 h. Total protein content (TP), superoxide dismutase (SOD), catalase (CAT) and myeloperoxidase (MPO) activity, as well as nitric oxide (NO) production, were evaluated in hemolymph cell-free fraction (HCF) and hemocytes lysate (HL). In addition, total hemocyte count (THC) was determined. In HCF, TP was significantly higher in abalone exposed to PEB than in the other treatments and CT at 0.5, 1 and 24 h. SOD activity in HCF was significantly higher in all treatments compared to the CT (1 h), while CAT and MPO activity was only significantly higher in abalone exposed to EUB compared to PEB at 1, 2 and 24 h. In the HL fraction, the percentage of SOD inhibition was significantly higher only in abalone anesthetized with EUB compared to the CT (0.5 h). These results suggest that the antioxidant activity of the species during the recovery phase from anesthesia was transient and restored after 24 h. Similarly, the immune response of H. rufescens at the systemic level was not altered by the anesthetics, suggesting that the species adequately tolerated the anesthesia process. This research provides evidence of the effects of anesthesia at the systemic level in red abalone for the proper selection of anesthetics for pearl culture.
  • Miniatura
    Ítem
    Progress towards development of a unique pearl culture technology for red abalone (Haliotis rufescens) in Chile
    (ELSEVIER, 2024-02-01) Sáez-Saavedra, Camila; Saucedo, Pedro E.; Acosta-Salmon, Hector; Tanguy, Arnaud; Araya, Rubén
    Abalone pearl farming is an aquaculture activity with great potential for future growth and diversification of the global pearl sector, which has been dominated for decades by pearls of marine pearl oysters of the genus Pinctada. Despite this potential, there is a significant lack of knowledge regarding methods for nucleus (bead) seeding and the process of pearl formation in abalone, compared to the well-studied pearl oyster model. To address this problem, this review first compares the main anatomical differences and similarities between both groups of mollusks, particularly those associated with the structure and role of mantle tissue on the synthesis of CaCO 3 compounds that integrate the inner nacreous layer. The iridescence (orient) and color properties of nacre in a cultured pearl is particularly related to the microstructure of aragonite crystals during biomineralization in each mollusk group. We then analyze the advantages and disadvantages of the adoption in abalone of methods originally developed for pearl oysters to produce bead-seeded pearls and half-pearls (or mab´e pearls). For the red abalone Haliotis rufescens in particular, updated information on commercial production of both bead-seeded and mab´ e pearls is provided as a case of success for Latin America (Chile). Finally, the current status and future prospects for abalone pearl farming are discussed, assessing technology gaps and challenges to be addressed for the pearl sector to achieve its full potential, particularly for Latin America.