Daniel Escobar-Camacho

1. Introduction Studies analyzing the variation of fish shape, size, and weight are often performed with preserved specimens in museum collections [1]. Fixation methods include freezing [2, 3], smoking [4], Davidson’s B, Borealene [5], and isopropyl alcohol; however, the most common and accepted form to preserve fish specimens is with fixation in 10% formalin (HCOH) and then transfer to 70% ethanol (EtOH) for long-term museum storage [5, 6].