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Of course, the surgery can be successful. If the tumour is not malignant and it is located in some easily operable place, for example on a fin, the surgery is easy and will be successful with a very high probability if done by a vet or even a skilled amateur. On the other hand, a malignant tumour already grown into some vitally important tissue may be inoperable. If any trace is left, it will grow again.

This is based on my 30-year experience of keeping and breeding tropical fish. If you want scientific articles, I bet there are many, but finding them might be a lot of work - here, for example, a koi healthy 15 months after a malignant tumour surgery: https://pdfs.semanticscholar.org/f1de/fb2d1effea3e64506b0e65dd8d6b28349507.pdf

Of course, the surgery can be successful. If the tumour is not malignant and it is located in some easily operable place, for example on a fin, the surgery is easy and will be successful with a very high probability if done by a vet or even a skilled amateur. On the other hand, a malignant tumour already grown into some vitally important tissue may be inoperable. If any trace is left, it will grow again.

Of course, the surgery can be successful. If the tumour is not malignant and it is located in some easily operable place, for example on a fin, the surgery is easy and will be successful with a very high probability if done by a vet or even a skilled amateur. On the other hand, a malignant tumour already grown into some vitally important tissue may be inoperable. If any trace is left, it will grow again.

This is based on my 30-year experience of keeping and breeding tropical fish. If you want scientific articles, I bet there are many, but finding them might be a lot of work - here, for example, a koi healthy 15 months after a malignant tumour surgery: https://pdfs.semanticscholar.org/f1de/fb2d1effea3e64506b0e65dd8d6b28349507.pdf

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Of course, the surgery can be successful. If the tumour is not malignant and it is located in some easily operable place, for example on a fin, the surgery is easy and will be successful with a very high probability if done by a vet or even a skilled amateur. On the other hand, a malignant tumour already grown into some vitally important tissue may be inoperable. If any trace is left, it will grow again.