Antimicrobials and Their Natural Alternatives—From Molecular Insights to On-Farm Interventions in Aquaculture

A special issue of Fishes (ISSN 2410-3888). This special issue belongs to the section "Nutrition and Feeding".

Deadline for manuscript submissions: closed (1 December 2022) | Viewed by 5447

Special Issue Editors

Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Newforge Lane, Belfast BT9 5GB, Northern Ireland, UK.
Interests: natural antimicrobials; mechanisms of infection; gut health; pathogens
Special Issues, Collections and Topics in MDPI journals
Agri-Food and Biosciences Institute, Belfast, Northern Ireland, UK
Interests: ecosystem impacts of marine aquaculture; benthic ecology; invertebrate host defence

Special Issue Information

Dear Colleagues,

The increase in shrimp consumption has led to the development of an extensive network of farms aiming to cover the current consumer demand. However, this fast development is often challenged by various pathogens (e.g., parasites) which can obscure this development in the absence of efficient control measures. The aim of this new topic is to publish recent developments in the area of alternatives to antibiotics in aquatic animals by looking into the biological mechanisms involved in their mode of action. We are also focusing on how novel alternatives can be used to prevent bacterial/viral and parasitic infections in aquaculture. Additionally, we will welcome science unfolding new management and the latest technological developments designed to increase biosecurity in aquaculture farming and improve performance.

Prof. Dr. Nicolae Corcionivoschi
Dr. Matthew Service
Guest Editors

Manuscript Submission Information

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Keywords

  • natural antimicrobials
  • mechanisms of infection
  • gut health
  • pathogens
  • on-farm interventions

Published Papers (2 papers)

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Research

19 pages, 7127 KiB  
Article
TRPV1 Receptor Identification in Rainbow Trout (Oncorhynchus mykiss) and Evaluation of the Effects Produced by Ocimum basilicum Super Critical Fluid Extract
Fishes 2023, 8(1), 38; https://doi.org/10.3390/fishes8010038 - 04 Jan 2023
Viewed by 1739
Abstract
Transient receptor potential vanilloid type 1 (TRPV1) has been investigated in humans and mammals; in recent years, some researchers have focused on this receptor in fishes. The present study aimed to identify TRPV1 receptors in cultures of RT-gill W1 cells and in the [...] Read more.
Transient receptor potential vanilloid type 1 (TRPV1) has been investigated in humans and mammals; in recent years, some researchers have focused on this receptor in fishes. The present study aimed to identify TRPV1 receptors in cultures of RT-gill W1 cells and in the organs of rainbow trout (Oncorhynchus mykiss), in addition to evaluating the possible modulation induced by super critical fluid extract of basil (Ocimum basilicum), named F1-BEO. In vitro evaluation consisted of cell cultures and immunocytochemistry assays. During in vivo experimental sessions, eighty trout were divided into five groups that received a fish diet supplemented with 0, 0.5, 1, 2 and 3% w/w F1-BEO. Forty trout were euthanized after 15 and 30 days; organs were collected and processed according to the immunohistochemistry technique. Receptor expression was quantitatively measured using Image Pro Plus software. TRPV1 was identified in RT-gill W1 cells and in all organs, with a higher positivity in the muscle layers of the stomach, intestine and kidneys. F1-BEO induced an increased expression of TRPV1 in the stomach while a lower expression was appreciated in the bowel. No morphological alterations have been highlighted in the liver or kidneys. Further investigation will be necessary to evaluate the functionality of this receptor in rainbow trout. Full article
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15 pages, 1753 KiB  
Article
The Use of Cinnamon Essential Oils in Aquaculture: Antibacterial, Anesthetic, Growth-Promoting, and Antioxidant Effects
Fishes 2022, 7(3), 133; https://doi.org/10.3390/fishes7030133 - 06 Jun 2022
Cited by 8 | Viewed by 3260
Abstract
Cinnamon essential oils (EOs) are widely known for their pharmaceutical properties; however, studies investigating the use of these EOs in aquaculture are scarce. The aims of this study were to evaluate the anesthetic effect of bathing silver catfish (Rhamdia quelen) with [...] Read more.
Cinnamon essential oils (EOs) are widely known for their pharmaceutical properties; however, studies investigating the use of these EOs in aquaculture are scarce. The aims of this study were to evaluate the anesthetic effect of bathing silver catfish (Rhamdia quelen) with Cinnamomum cassia EO (CCEO) and its nanoemulsion (NCCEO); the growth-promoting and antioxidant effects of dietary supplementation with CCEO in silver catfish; and the in vitro antibacterial effect of CCEO, NCCEO, and Cinnamomum zeylanicum EO (CZEO) against bacteria isolated from diseased silver catfish. The two cinnamon EOs showed promising antibacterial activity, which was potentiated by the nanoemulsion. CCEO showed satisfactory anesthetic activity in silver catfish, and its nanoemulsion intensified the sedative activity. Supplementation of 1.0 mL CCEO per kg of diet for 60 days increased weight, length, and weight gain when compared to the control group, evidencing the growth-promoting activity of this EO. Dietary supplementation of CCEO for 30 and 60 days also showed an antioxidant effect, as it decreased levels of thiobarbituric acid reactive species and increased the superoxide dismutase activity in the liver of silver catfish. Therefore, cinnamon EOs have a promising use in aquaculture. Full article
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