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IFFO response: antibiotic resistant genes found in fishmeal

Click on the flag for more information about United Kingdom UNITED KINGDOM
Thursday, September 07, 2017, 00:50 (GMT + 9)

After analysing a recent publication of a scientific paper indicating there is a potential for fishmeal used in aquaculture feed to be a vector for antibiotic resistant genes, IFFO has decided to exercise caution in how the results are interpreted without further confirmation of the findings as this is a first study in the subject. [1]

The organisation also states that the work is also notable as having been undertaken on a very limited sample number: 5 fishmeal products; 2 terrestrial animal products, and as such it considers it is not an extensive investigation. 

IFFO points out that while antibiotic resistance is a concern in any food stuff, (and the entity recognises the importance of managing antibiotics in order to protect the availability of treatments for human health), it believes the paper raises several questions and has made the following observations:

  • The majority of fishmeal is produced from whole fish caught in the wild where there is no contact with antibiotics, nor are antibiotics used in the manufacturing process. The paper shows a sample of Peruvian fishmeal, which would be entirely made from wild caught Peruvian anchovy, to have seven different antibiotic residues present. As the sampling was conducted in China and not in Peru, IFFO members are seeking clarification of the measures taken to protect samples from contamination.
  • Although the majority of fishmeal comes from whole fish with the pelagic species dominating, some fishmeal is produced from recycled fish trimmings. IFFO estimates that approximately 33 per cent of the total annual volume comes from this raw material, and although some of the source of this raw material will be aquaculture byproduct, the majority is wild capture byproduct and, again, would not come into contact with antibiotics. The use of antibiotics on farmed fish is expensive and limited, as noted by a Joint FAO/OIE/WHO [2] Expert Consultation on Antimicrobial Use in Aquaculture in countries where “licensing and regulation of the use of antimicrobials are strictly enforced and where use is always under veterinary guidance, it would be typical that 2-4 agents would be available to aquaculture”.
  • In general, aquafeed companies have quality management systems in place to check the integrity of the ingredients that are used in their feed manufacture. 
  • Antibiotic Resistant Genes (ARGs) are susceptible to degradation in the environment and the transfer of genes to other bacteria is a complex process with a number of conditions that must be met for transfer to occur. It is not clear what risk detectable ARGs represent in the mariculture environment.
  • ARGs have been found to be present in apparently isolated locations around the world, including some very extreme environments such as permafrost and cave systems. They may therefore have become somewhat ubiquitous in the environment. The inclusion of a sample control in the paper such as other marine sediments not within the vicinity of a mariculture unit would have helped to identify whether fish farms are actually the source of the ARGs. IFFO wonders whether ARGs may be present in other marine sediments.
  • Only very limited (n=2) other feed ingredients have been included in the test which would have been a useful comparison or control. It is possible that the presence of nutrients in the sediment (from either fishmeal or other feed ingredients) are encouraging the growth of sediment bacteria which may contain ARGs that do not originate from fishmeal.
  • Fish farms in China are often notable for their proximity to human populations, and it may well be that any selection pressure on bacterial communities arising from antibiotic use is a result of other sources, such as sewage effluent, for example. For centuries China has been a leader in polyculture systems where avian species such as ducks are reared in contact within an aquaculture system.  In many instances, these are not isolated or true monoculture systems. The wide range of different antibiotics observed also aligns with the suggestion that the source is not the fish farms themselves as antibiotics used as fish chemotherapeutants have tended to be limited in number.
  • The authors state there is a poor link between Antibiotic Resistant Genes (ARG’s) and the specific antibiotic, which appears contradictory. 

Food safety is one of IFFO’s core values and fishmeal is rightly regarded as a high quality product that supports the global production of millions of tonnes of fish, pork, and poultry. Therefore, the organisation stresses that it is important that a perspective is maintained in interpreting the results of a limited, early study, around which there are some questions about the sampling methodology.

In IFFO's view, to extrapolate the results of a limited study to an important global supply chain is unreasonable without much additional information.

-------------------------------------

[1] Fishmeal Application Induces Antibiotic Resistance Gene Propagation in Mariculture Sediment.

Ying Han, Jing Wang, Zelong Zhao, Jingwen Chen, Hong Lu, and Guangfei Liu.
Environmental Science & Technology Article ASAP
DOI: 10.1021/acs.est.7b02875Han et al “Fishmeal Application Induces Antibiotic Resistance GenePropagation in Mariculture Sediment”
[2]
ftp://ftp.fao.org/ag/agn/food/aquaculture_rep_13_16june2006.pdf

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