Abundance profiles of functional genes or gene sets in the microbial assemblages based on the metagenome and metatranscriptome. Metabolic pathways were reconstructed in each metagenome for polysaccharide and protein degradation, fatty acid beta-oxidation, and sulfur and nitrogen metabolism, as well as various fermentations and microaerophilic respirations. The total number of genes or gene sets from the metagenomic data (left) and the relative abundance (normalization, TPM value) of the genes or gene sets in metagenomic data (middle) and in metatranscriptomic data (right). Most genes and enzymes were identified by their KEGG Ortholog (KO) number, gene name, and enzyme commission (EC) number (when applicable). MX, wood chips; FP, wheat bran; YL, fish scales; YR, fish muscle; YY, fish oil.