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Since the late 19th century, the Amazon species  Colossoma macropomum  (tambaqui) has been exploited commercially and the climate change has contributed to decline in tambaqui numbers. Although germ cell cryopreservation and transplantation can help preserve the species’ genetic resources semipermanently, its germ cell behavior has not been analyzed to date. In this study, we isolated the tambaqui’s  dead end  gene ( dnd ) homolog ( tdnd ) and used it as a molecular marker for germ cells to obtain basic information essential for transplantation. The amino acid sequence showed 98% similarity and 53% identity with the zebrafish  dnd . Phylogenetic analysis and the presence of consensus motifs known for  dnd  revealed that  tdnd  encodes the  dnd  ortholog and its transcript is detectable only in the testes and ovaries, showing a strong positive signal in oocytes and spermatogonia. The tambaqui possesses, at least, three different transcripts of  tdnd  which show dissimilar expression profile in undifferentiated and sexually mature animals, suggesting that they play distinct roles in germline development and they may influence the choice of donors for the cell transplantation study.

The germ cell marker dead end reveals alternatively spliced transcripts with dissimilar expression