T. lt; P gt; current invention; oacute; n refers to an M amp; eacute; all immunity and amperes; oacute; n refers to the protection of inter amp; eacute; s refers to the protection of Da amp; ntilde; or the production of; Aacute; sitos by ecopar amp. It is better to invent and ampere; oacute; n provides formula and ampere; oacute; n immunity and ampere; eacute; Nica to protect fish, mainly salmon and rainbow trout; Iacute; RIS, Da amp; ntilde; or by ANP; ldqoe; pioos Mar amp; rdqoe; (sea ice)For example, caligus rogerpresseyi or Lepeophtheirus salmons, and as amp; Iacute; reduce economic and amp harm; oacute; mico, infrac amp; oacute; N, the couple and amp; Aacute, aquaculture. Formula and amp; oacute; n immunity and amp; eacute; invention and amp; oacute; n includes ant and amp; Iacute; gene, amino and amp sequence; Iacute; derived from the former and amp's dicas; oacute; gene encoding for protein and amp; Iacute; NAS; related to important cell processes of C amp; Aacute; leguus (California).M amp; Aacute; Sant lt; / P gt identified from V1 to V6 series;<;p>;La presente invenció;n se refiere a un mé;todo de inmunizació;n para proteger peces de interé;s, del dañ;o producido por ectopará;sitos. Preferentemente la invenció;n aporta una formulació;n inmunogé;nica para proteger peces, principalmente salmones y truchas arcoí;ris, del dañ;o causado por &ldquo;piojos de mar&rdquo; (sea lice), tales como, Caligus rogercresseyi o Lepeophtheirus salmonis, y así; disminuir el perjuicio econó;mico que provoca la infecció;n por este pará;sito en la acuicultura. La formulació;n inmunogé;nica de la invenció;n comprende el uso como antí;genos, de secuencias aminoací;dicas menores de 30 mer, derivadas de la expresió;n de genes codificantes para proteí;nas asociadas a procesos celulares vitales de Cá;ligus (Caligus rogercresseyi)