Tropical fish farmers for the aquarium trade used to use them (Chlortetracycline also called aureomycin, and some others). It is doubtful that any food fish farmer in the US or Canada uses them. Wish I had more data at hand, but Canada is closing most salmon and trout farms because of disease and fish louse (Argulus foliaceus (or Monoculus foliaceus Linnaeus, 1758 name) ) problems.

There is scientific evidence that antimicrobials (mostly from the tetracycline family) are used in fish farming and they are usually directly thrown in the water or added to fish feed.

There seem to be a few different studies investigating the potential connection between antibiotics used in aquacultures, transportation pathways and human exposure. See a few example articles below:

Article Occurrence, distribution and bioaccumulation of antibiotics ...

Article Antibiotics in typical marine aquaculture farms surrounding ...

Article Tissue distribution, bioaccumulation characteristics and hea...

thanks Carl Alexander Frisk

thanks Gilbert Nchima

thanks Lewis Maccarter

Antibiotic resistance is a significant public health problem that can be due to a variety of causes, including indiscriminate antibiotic use in humans, food-producing animals, and aquaculture. Bacterial diseases in fish, which normally occur when they are stressed, cause high morbidity and mortality, resulting in substantial economic loss. Antibiotics and other antimicrobial agents are commonly used by fish farmers to prevent and treat diseases in their fish in order to stop such massive losses. They can also be used to clean eggs and appliances and to ensure good water quality. Over the years, there has been a troubling rise in global reports of antibiotic resistance on fish farms. Despite the fact that some farms do not use antibiotics directly, fish farming practices such as the use of animal manure, wastewater, and human excreta in fish farms, as well as the disposal of untreated effluents from fish farms, can lead to antibiotic resistance in fish farms and nearby water bodies. Kindly check the following link that may be useful: https://infectious-diseases-and-treatment.imedpub.com/antibiotic-use-and-practices-in-selected-fish-farms-in-the-ashanti-region-of-ghana.php?aid=21617

Also, kindly check this link that may be useful:

Antibiotic use in fish farms poses threat to humans, study says:

https://www.aquaculturenorthamerica.com/antibiotic-use-in-fish-farms-poses-threat-to-humans-study-says/

There might be but this does not mean we are using the best procedure. We might use antibiotics to avoid contamination but this could mean resistance (acquired by bacteria) especially in the insertion on genes or cloning. In aquaculture, antibiotics may be used in farms for similar purposed, recycling of effluents and later on for farming. All these make "in theory" the quality of fish be reduced or to subttle lies on what we buy. No matter what it is, it must be labelled.

Since the hatchery and fish farms live in a limited space, this exposes them to various diseases, especially bacterial diseases, and to control these diseases, antibiotics are used in order to prevent them before symptoms of disease signs appear on them or treatment when the disease appears, many fish farm owners use antibiotics. Vitality

Dear Ahmad Al Khraisat thanks for this interesting and important technical question. Actually, the use of antibiotics in fish farms is common but bears serious risks, particularly the development of bacterial resistance and environmental issues.

For more information about this please have a look at the following useful articles:

1. Heavy use of antibiotics in aquaculture: Emerging human and animal health problems – A review

Article Heavy use of antibiotics in aquaculture: Emerging human and ...

This review article is freely available as public full text on ResearchGate.

2. Current Status of the Use of Antibiotics and the Antimicrobial Resistance in the Chilean Salmon Farms

Article Current Status of the Use of Antibiotics and the Antimicrobi...

3. Abuse of Antibiotics in Aquaculture and it’s Effects on Human, Aquatic Animal and Environment

(see attached pdf file)

Yes ! Very much so.

Agree with Frank T.Edelmann.

thanks Frank T. Edelmann for Excellent information

thanks Prof Dr Suhad Qasim saeed Almousawi for comment

thanks .... Sdert for comment

thanks Manal Hadi Kanaan for comment

Instead of human antibiotics you could use a dye such as Acriflavine (acriflavinium chloride) which controls many bacteria that attack fish. I used it with some success in a large aquarium fish store I once owned. Workers should be careful with the concentrated, powder form as it is an eye and raspatory irritant.

thanks Lewis Maccarter for comment

Hi Ahmad Al Khraisat

I hope this comment be able to help you to know more

You can get more useful information from the following articles

https://www.semanticscholar.org/paper/Abuse-of-Antibiotics-in-Aquaculture-and-it-%E2%80%99-s-on-%2C-Rasul-Majumdar/75e1decdd2bea848c4b35209feb69ad2b2a3131d

Article Antibiotic Use And Practices In Selected Fish Farms In The A...

Good luck

thanks My Friend Amin Marandi For good information

Agree with Frank T. Edelmann

Yes. Please take a look at this useful link.

https://www.nature.com/articles/s41467-020-15735-6

Use of antibiotics in fish farming has side effects, see this link

https://academic.oup.com/cid/article/49/8/1248/428193

In aquaculture, antibiotics are used to treat bacterial illnesses. Antibiotics are sometimes used to treat infections, but they are more usually used to prevent disease by treating the water or fish before it becomes infected.