Monitoring of reproductive health in the striped catfish Pangasianodon hypophthalmus (Sauvage, 1878) from the Saen Saep Canal, Thailand

Thawanrat Puttipong,Jes Kettratad,Tassaporn Kanjanarakha,Chitchai Chantangsi,Sinlapachai Senarat

doi:10.12982/vis.2022.006

Abstract

Khlong Saen Saep is one of the most important and large canal systems in Bangkok, Thailand. However, the emergence of heavily polluted water has occasionally been reported due to the domestic sewage and industrial effluents discharged into the system. This situation may affect the reproductive status of aquatic lives residing in this canal. To evaluate the reproductive status of the canal inhabitant, the striped catfish Pangasianodon hypophthalmus (Sauvage, 1878)—a common dweller of the Saen Saep Canal—was collected from two selected stations, the Bumpen Nua Temple and the Kamalun Islam Mosque. The fish gonads were then anatomically and histologically examined. The results indicated that neither parasites nor ovary with external abnormality were found. Nevertheless, several histological alterations were detected, including vacuolar degeneration of previtellogenic oocytes, accumulation of melanomacrophage centers (MMCs), and atretic oocytes. Moreover, severe histopathological changes, such as the eosinophilic cytoplasm of spermatogonia, MMCs, blood congestion, and syncytium of spermatozoa, were observed in the fish testis. Our study suggested that the environmental stress and pollutions previously reported from the Saen Saep Canal possibly underpin the gonadal impairments of P. hypophthalmus examined and may have adverse impact on the reproductive health of others living in this canal system

Highlights

An economically important waterway of Bangkok, Thailand, Khlong Saen Saep is one of the most prominent canals that provides a great support to people living in both urban and rural areas in the form of public transportation and a source of water for domestic, agricultural, and industrial utilization (Pollution Control Department, 2018, 2019)
Our anatomical examination revealed that the existence of parasites and gonads with external abnormality were not observed in the fish sampled from the Bumpen Nua Temple and the Kamalun Islam Mosque (Figure 2A-2B)
At histological level, a sign of severe vacuolar degeneration of previtellogenic oocyte was found with 100% prevalence and only in the fish collected from the temple (Figure 3A-3B, Table 1)

Summary

Introduction

An economically important waterway of Bangkok, Thailand, Khlong Saen Saep is one of the most prominent canals that provides a great support to people living in both urban and rural areas in the form of public transportation and a source of water for domestic, agricultural, and industrial utilization (Pollution Control Department, 2018, 2019). Overexploitation of this canal by many anthropogenic activities results in its gradual deterioration as shown by the emergence of severe pollution and inhospitable condition (Pollution Control Department, 2018, 2019; Sawat-Uea, 2010). Living in such ecosystem can cause harmful effects on the health of aquatic animals

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Conclusion