Abstract.A new multivalvulid myxosporean species, Kudoa dianae sp. n., is described from bullseye puffer, Sphoeroides annulatus (Jenyns) (Tetraodontiformes: Tetraodontidae). Plasmodia develop in extramuscular sites, in the wall of oesophagus and less frequently on mesenteries. Mature spores can reach lumen of the digestive tract directly by disruption of plasmodial wall or via macrophage transport to the oesophageal epithelium. New species is characterised by morphology of spores and by the complete sequence of SSU rRNA gene that differs from all hitherto known sequences of Kudoa species. Spore morphology (moderate-sized, simple non-ornate spores, quadrate in apical view) clusters with that of Kudoa scienae, K. cerebralis, K. chilkaensis, K. leiostomi, K. funduli, K. cascasia and K. ovivora. Analysis of phylogenetic relationships (using SSU rRNA gene sequences) among five Kudoa species, the molecular data of which are available thus far, revealed that K. dianae is distinguishable from these five species and that its closest relation is with K. miniauriculata.

En este trabajo se presenta un panorama general del impacto de los parásitos en el cultivo de tilapia. Se describen algunas estrategias, incluyendo la aplicación de tratamientos naturales como una alternativa a los agentes químicos o fármacos, que deberían considerarse para la prevención de eventos epidémicos. Sin duda, los desarrollos biotecnológicos que garanticen la prevención y control de enfermedades, sin poner en riesgo la salud humana o del ecosistema, deberían prevalecer en la acuicultura de la tilapia.

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