AI Article Synopsis
- The study focuses on detecting potentially harmful trematode blood flukes, specifically Cardicola, in bluefin tuna cultures using a new method for finding their eggs in tuna gills.
- The researchers examined gill filaments from various areas of Atlantic bluefin tuna, revealing that egg distribution was highest in specific regions and challenging previous findings.
- A new abbreviated method, called the T-two test, shows great sensitivity for detecting infections efficiently, suggesting only ten samples are enough for farmed tuna, while more samples are needed for wild-caught fish.
Article Abstract
Trematode blood flukes of the genus Cardicola are potentially lethal in bluefin tuna cultures. The present study proposed a new method to detect aporocotylid eggs in tuna gills. Aporocotylid eggs were detected by analysing a pair of gill filaments of five transversal areas of the eight holobranches of one hundred Atlantic bluefin tuna and observed with glycerol and a stereomicroscope with an oblique brightfield. Data were gathered according to holobranches, transversal areas and their combination. Eggs were uniformly distributed among the holobranches, but they had the highest prevalence in the second and fifth transversal areas, which is controversial with respect to previous studies of egg distribution. An abbreviated method called the T-two test, which had the highest sensitivity (96.8%), is proposed for the detection of Cardicola spp. infections instead of the analysis all the holobranches. The T-two test limits the time and cost of the egg parasite screening analysis. The analyses of ten samples could be sufficient to detect the presence of parasites in farmed bluefin tuna; fish from the wild are expected to be less infected and more samples (45) would therefore be necessary.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.vetpar.2017.09.018 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Annual migrations, vertical habitat use and fidelity of Atlantic bluefin tuna tracked from waters off the United Kingdom.
Sci Rep
January 2025
Environment and Sustainability Institute, University of Exeter, Penryn, TR10 9FE, UK.
Understanding the spatial ecology of commercially exploited species is vital for their conservation. Atlantic bluefin tuna (Thunnus thynnus, ABT) are increasingly observed in northeast Atlantic waters, yet knowledge of these individuals' spatial ecology remains limited. We investigate the horizontal and vertical habitat use of ABT (158 to 241 cm curved fork length; CFL) tracked from waters off the United Kingdom (UK) using pop-up satellite archival tags (n = 63).
View Article and Find Full Text PDFAuthor Correction: Docosahexaenoic acid (DHA) is a driving force regulating gene expression in bluefin tuna (Thunnus thynnus) larvae development.
Sci Rep
December 2024
Hopkins Marine Station of Stanford University, 120 Ocean View Blvd, Pacific Grove, CA, 93950, USA.
Development of Single-Nucleotide Polymorphism (SNP)-Based Species-Specific Real-Time PCR Assays for Authenticating Five Highly Priced Tuna.
Foods
November 2024
Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
Tuna are economically important as food resources in food markets. However, because tuna is often processed into steaks or fillets, the meat can be difficult to identify through morphological features. For effective fishery management and to protect the rights of consumers, it is necessary to develop a molecular method to accurately identify the species used in tuna products.
View Article and Find Full Text PDFHigh-resolution biologging of an Atlantic bluefin tuna captured and eaten by a supposed orca.
Sci Rep
November 2024
Hatherly Laboratories, University of Exeter, Prince of Wales Road, Exeter, EX4 4PS, UK.
Article Synopsis
- Biologging technology has been employed to track the behaviors and migrations of various wild animals, including a notable event involving the predation of an Atlantic bluefin tuna by an orca.
- The study details a 19-minute predation sequence where the tuna displayed high activity levels during its capture and subsequent handling by the orca.
- Unique datasets collected from both the tuna and orca give valuable insights into their energetic behaviors and patterns of interaction in the ocean.
Body size and isotopic profiles enable discrimination between long-term resident and highly migrant contingents of Atlantic bluefin tuna.
Mar Environ Res
November 2024
Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, 11510, Puerto Real, Spain.
The Atlantic bluefin tuna (ABFT) population ranges throughout the Atlantic Ocean and Mediterranean Sea, and consists of multiple contingents that use diverse habitats and show different movement patterns over the life cycle. Based on body size, elemental and isotopic data of C and N in muscle and liver, we analysed eastern-stock ABFT by comparing mid-sized individuals caught by hook-and-line gears with larger individuals harvested from traps in the Strait of Gibraltar (SoG). Our results show that trophic-related chemical markers have potential for separating temporarily sympatric contingents throughout the ABFT population range, reflecting size-dependent spatial distribution and differential patterns of residency and migration.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!