# Monogeneans on exotic Indian freshwater fish. 8. Co-translocation of Cichlidogyrus tilapiae (Monogenea, Dactylogyridae) with pindani Chindongo socolofi (Cichliformes, Cichlidae): first report of this parasite genus in India within aquarium trade facilities

## TL;DR

This study reports the first occurrence of the parasite Cichlidogyrus tilapiae in India, found on ornamental cichlid fish in aquarium trade facilities.

## Contribution

This is the first report of the parasite genus Cichlidogyrus in India and adds a new host and location to the known distribution of C. tilapiae.

## Key findings

- Cichlidogyrus tilapiae was detected in 22.7% of examined pindani fish in Indian aquarium shops.
- Morphological and genetic analyses confirmed the presence of C. tilapiae in India.
- The study expands the known host and geographic range of C. tilapiae.

## Abstract

The pindani, Chindongo socolofi (Cichliformes, Cichlidae) is a popular freshwater ornamental fish from Lake Malawi in Africa. Although identifying parasites associated with the global ornamental fish trade is critical for developing biosecurity practices, little is known about the parasite fauna of C. socolofi. Therefore, this study sought to determine what monogenean parasites C. socolofi harbours in India. Adult specimens of this host species were collected from various aquarium shops across the country between 2020 and 2022, and their gills were subjected to parasitological examination. Monogeneans were detected in five host specimens (22.7%) with low mean intensities (6.2 ± 3.8). They were identified as Cichlidogyrus tilapiae (Monogenea: Dactylogyridae) based on the presence of the following morphometric characteristics: two pairs of anchors, two auricles on the dorsal bar, a V-shaped ventral bar, and an accessory piece with a folded rim and a bent bifurcated tip. The morphological identification was confirmed by the sequence analysis of the specimen’s 18S-ITS1 gene regions and 28S rRNA genes to C. tilapiae from Paratilapia polleni (Cichliformes, Cichlidae) in Madagascar. This article is the first report on a species of Cichlidogyrus in India, found in aquarium shops, contributing to the growing list of known freshwater monogeneans that are being distributed globally via the ornamental fish trade. Additionally, it adds a new host species (C. socolofi) and geographic location (India, within aquarium trade) to the existing knowledge of C. tilapiae, a widespread and often co-introduced tropical fish parasite.