Characteristics:

1-They produce anticoagulants and suck the fish's blood.
2-Different species of parasite included in the skin, fins, the gills and the mouth, and some species located in muscles.

Biology:

1- Cymothoids are protandrous hermaphrodites.
2- Each juvenile develops first into a male, but if there are no any females nearby.
3- The male will later become a female and attach permanently to the host.
4- Female is able to secretes pheromones which prevent male cymothoids in the vicinity from becoming female.

DNA Barcodes to Identify and Classify Living Organisms (Main Steps):

1-Primers Design Specific to Barcoding Gene.
2-DNA Isolation
3-PCR for Barcoding Gene.
4-Gel Purification Method.
5-DNA Sequencing for Barcoding Gene.
6-Bioinformatics Analysis
7-Genbank Submission
8-Dendrogram.