fish| Ray-finned fish |
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 Atlantic herring
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Modifying fish to make them more attractive as pets is an increasingly divisive issue. Historically, artificially dyeing fish was fairly common, with glassfish for example being injected with fluorescent dyes.
At its best, a properly maintained aquarium allows the fish to socialise with their own kind and in many cases breed successfully.
According to the FAO, at least 90% of freshwater aquarium fish are captive bred [1].
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