Marine Leech Infestations
Marine leeches have striated bodies with muscular body wall, with anterior and posterior suckers, usually 8-12 mm long.
Zeylanicobdella arugamensis (Fig. 5-16a)
Grouper, milkfish, tilapia
Parasite attaches to the skin, fins (Fig. 5-16b), eyes, nostrils, operculum and inside the mouth. The attachment and feeding sites are hemorrhagic.
EFFECTS ON HOST:
The attachment areas are hemorrhagic. The parasite feeds on the host’s blood and may result to anemia. Leeches act as vectors of viruses, bacteria and protozoan blood parasites.
Gross examination of the host fish.
PREVENTION AND CONTROL:
• Use of filters
• Mechanical removal
• Complete drying of facilities
• 50-100 ppm formalin bath for 1 h