SEASONAL VARIATION OF GILL, SKIN, MUSCLE, LIVER AND KIDNEY PATHOLOGY OF MRIGAL (Cirrhinus cirrhosus) IN CULTURAL POND FISHERIES, MYMENSINGH, BANGLADESH

Abstract

An investigation on the seasonal variation of gill, skin muscle, liver and kidney pathology of Mrigal (Cirrhinus cirrhosus) was carried out from four Government (Govt.) and four Private (Pvt.) fish farms, Mymensingh, Bangladesh during June, 2010 to May, 2012. Fish sampling and water quality parameters were monitored monthly basis. For histopathological studies skin, muscle, gill, liver and kidney were collected, processed and stained in Haematoxylin and Eosin. Histologically, Mrigal of different fish farms were more affected in colder months. All the investigated organs of Mrigal were exhibited few abnormalities during summer, however, mild hyperplasia, haemorrhage, partial loss of secondary gill lamellae, marked and hypertrophy was observed during the rainy season. Several pathological changes like necrosis, fungal granuloma, protozoan and monogenean cyst, vacuolation, melanomacrophase, haemorrhage, hypertrophy, hyperplasia and clubbing were recorded in all the investigated organs. Among them fish gills and skin were more affected followed by liver and kidney. In some cases, large bacterial colony and protozoan cyst were observed in the secondary gill lamellae of Mrigal. The ectoparasites were very common in gills and skin of all fishes. Water quality parameters were taken and management practices were investigated fortnightly interval in different farms. These were almost similar for all experimental ponds. The risk of being infestation by parasites of carp significantly (p<0.001) increased when the water quality parameters such as temperature, dissolved oxygen, pH, ammonia, hardness, alkalinity, transparency and depth of water etc. were not maintained the optimum level.

Aphanomyces invadans: The Causative Agent of the Epizootic Ulcerative Syndrome in Albino Northern Snakeheads

“…Upon binding with the epidermis, the secondary zoospores of A. invadans form secondary cysts and then germinate into nonseptate hyphae and release proteolytic enzymes that facilitate penetration of the skin, muscle, and internal organs, precipitating the typical ulcerative lesions (Phillips et al 2008; Majeed et al 2017). Rainfall is conductive to the binding of the secondary zoospores since the low oxygen caused by rainfall could result in fish skin damage, such as epidermal loss and dermal splitting, necrosis, and hemorrhage (Pathiratne and Jayasinghe 2001; Das and Chandra 2018). Temperature is vital to the mortality associated with EUS.…”

A Deep Survey of Fish Health for the Recognition of Useful Biomarkers to Monitor Water Pollution

“…Subsequently, changes in behavior or external appearance take place [8]. Histological and immunohistochemical analyses, therefore, represent a sensitive and fundamental tool for the early determination of the negative effects induced by toxic and/or polluting substances at the morphophysiological and biochemical level of the organs most sensitive to aquatic pollution, such as gills, livers, spleens and kidneys [13,14]. Performing essential functions such as metabolism and detoxification of toxic substances, the liver and spleen are frequently used as tools for fish health assessment [15].…”

The Percentage of Male and Female Argulus Infesting Cyprinidae Fish in Magelang Regency, Central Java, Indonesia

“…The main problem in cultivating fish in Indonesia to date revolves around parasites and infectious diseases. The disease causes economic losses because it can result in less optimal fish harvest (Carella and Sirri, 2017;Das and Chandra, 2018). One cause of the disease is the infestation of parasites (Picard Sánchez et al, 2020).…”