For analysis of the P. dicentrarchi genome and transcriptome, trophonts (107) were concentrated by centrifugation, frozen in liquid nitrogen and sent on dry ice to Future Genomic Technologies (Leiden, Netherlands). For sequencing of the complete genome of the ciliate, a combination of short reading sequencing (Illumina technology) and long reading sequencing (Nanopore technology) was used (Oxford Nanopore Technologies). For de novo assembly of the parasite genome, the data sets were combined using the TULIP program v0.440 (link). Transcript sequences from Illumina RNA- Seq data (fragments of approximately 100 bp), obtained by amplification by SBS, were assembled using Trinity software (v2.6.5)41 (link), included within the Galaxy application (https://usegalaxy.org/). The assembled sequences were analyzed by homology, with Blastgo 5.0 software (Biobam, Spain), and annotated. The sequences that encode proteins that are potentially related to the ciliate AOX were then selected from the Tetrahymena thermophila gene and protein sequences database by using the BLASTx tool Wiki TGD (https://www.ciliate.org/blast/blast_link.cgi).
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