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In fish there is an innumerable variety of neoplasias that arise essentially from all cell types. Neolasia here, we will focus on the neoplasias that appear spontaneously in these animals and will not cover the experimentally induced neoplasias and/or the animal models of neoplasias. As for diagnosis, in general, specialists in aquatic organism pathology are not so familiar with the diagnosis of neoplasias. Infectious pathology, as opposed to non-infectious pathology, is the predominant condition in this area and, of course, these are of greater importance because some infectious diseases generate great economic losses, while neoplasias are isolated pathologies, with some exceptions. In the last 20 years, 10 neoplasias in different species have been diagnosed in our laboratory, and we reported their characteristics in this paper. We also made a detailed bibliography review and observed how 90 neoplasias among 56 species of teleosteal fish were reported. Neoplasias in fish, unlike other diseases, do not generate great losses to aquaculture. However, the true value of neoplastic pathology compared is to better understand the histiogenesis and biological behavior of neoplasias in mammals and humans. Carcinogenesis is generally complex and in most neoplasias in both mammals and fish, the origin is unknown, and it seems that there are many factors that contribute to the onset and growth of neoplasias. Review Article Romano and Pedrosa; ARRB, 35(12): 134-153, 2020; Article no.ARRB.64379 135

Neoplasias in Fish: Review of the Last 20 Years. A Look from the Pathology