BioConcepts

fishesἰχθύες (gr.); Pisces (lat.); Fische (ger.)

• A class of vertebrate animals, provided with gills throughout life, and cold-blooded; the limbs, if present, are modified into fins, and supplemented by unpaired median fins. (OED)
  category animal

  c. -350 (BC)

  Γένη δὲ μέγιστα τῶν ζῴων, εἰς ἃ διῄρηται τἆλλα ζῷα, τάδ’ ἐστίν, ἓνμὲν ὀρνίθων, ἓνδ’ ἰχθύων, ἄλλο δὲ κῆτος. Ταῦτα μὲν οὖν πάντα ἔναιμά ἐστιν. [Ein Theil der Thiere lässt sich in grosse Abtheilungen bringen; dergleichen sind die Vögel, die Fische, die Wale, welche sämmtlich Blutthiere sind.]

  Aristotle (c. 350 BC), Historia animalium 490b7-10 (transl. H. Aubert and F. Wimmer 1868).

  1735

  Pisces. Corpus apodum, pinnis veris instructum, nudum, vel squaomosum

  Linnaeus, C. (1735). Systema naturae: [Regnum Animale].