change minimum length sequence- from 32 (implicit) to 20 for lamproie

scripts/filter_and_demultiplex.sh

@@ -90,6 +90,7 @@ awk '{ print $2"\t"$3}' ${TAGS} | while read TAG_NAME TAG_SEQ ; do
     #### Dereplicate at the study level
     vsearch \
         --quiet \
+        --minseqlength $MIN_LENGTH \
         --derep_fulllength "${TMP_FASTA}" \
         --sizeout \
         --fasta_width 0 \