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Gill Pathology of Juvenile Carps in Nursery Ponds

G.U. Ahmed
Faculty of Fisheries, Bangladesh Agricultural University, Mymensing 2202, Bangladesh

M.j. Hoque
Faculty of Fisheries, Bangladesh Agricultural University, Mymensing 2202, Bangladesh

M.M. Haque
Faculty of Fisheries, Bangladesh Agricultural University, Mymensing 2202, Bangladesh

Abstract/ Executive Summary:

Gill pathology of juveniles of two Indian major carps Labeo rohita and Cirrhinus mrigala were studied for a culture period of three months in a private and a government fish farm ponds. Under histopathological observations, only protozoan parasite, Myxobolus sp., was recorded as cyst. These myxosporidian cysts were high in the gills of L. rohita of the government farm pond followed by C. mrigala of the private farm pond. Hypertrophical gill lamellae (primary and secondary) with loss of secondary lamellae were evidenced in C. mrigala of privately operated pond.

Keywords: Histopathology, Myxobolus sp., Carp, Nursery ponds

Location: Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh

Start Date: 00-00-1995

End Date: 00-00-1995

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To investigate the gill diseases through histopathological study of juvenile L. rohita and C. mrigala from two nursery ponds in different locations and of different management systems.

Methodology:

The experimental fish samples were collected from two nursery ponds: one pond of a private farm and the other, from a government one. The private one, at the "Jhalak Fish and Shrimp Farm", Gouripur, Mymensingh, was designated as pond-1 (area 30 decimals), and the government owned one, at "Fish Seed Multiplication Farm", Trishal, Mymensingh, was designated as pond-11 (66 decimals). To kill the insects and all other animals of the ponds, phostoxin (5 tabs/40 m 2) and rotenone (20 gms/40 m²) were applied to pond-1 and pond-II, respectively. After 7 days of toxin application the ponds were fertilized by urea (1 00 gms/40 m² in pond-1 and 200 gms/40 m² in pond-11), TSP (90- gms/40 m² in pond-1 and 100 gms/40 m² in pond-11) and cowdung (4.5 kg/40 m²). In pond-1, Labeo rohita, Cirrhinus mrigala, Puntius gonionotus and Cyprinus carpio (each species in equal number) were stocked at a total density of 70 fingerlings/40m2, and in pond-11, only L. rohita and C. mrigala (1 :1) were stockedat a density of 45 fingerlings/40 m². Supplemental feed composed of rice-bran and mustard-oilcake (4:1) was given twice a day (around 08.30 h and 15.00 h) at the rate of 5% of the body weight of the stocked fishes in each time in each pond. Overnight soaked oil-cake was mixed with rice-bran and applied to the ponds in dough form. L. rohita and C. mrigala fingerling samples were collected from the ponds fortnightly for three months. In each sampling, 12 fish of each species from each pond were taken for detailed observations of which 4 fish of each species were used for histological study. The gill samples were fixed in 10% formalin and processed in an automatic tissue processor. Four gill-sections were taken for each sampled specimen and were examined under microscope to observe whether they were infected by Myxobolus sp. cysts or not. The number of infected fishes was recorded and their percentage among the sampled fishes was calculated. A squash preparation of gill was taken over glass slides and was covered with cover slip before microscopic examination. An average of 30 spores from gill of each fish were measured.

Source of Information: Bangladesh J. Fish. Res., 2 (1 ): 63-67, 1998

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Under histopathological observations, only protozoan parasite, Myxobolus sp., was recorded as cyst. These myxosporidian cysts were high in the gills of L. rohita of the government farm pond followed by C. mrigala of the private farm pond. Hypertrophical gill lamellae (primary and secondary) with loss of secondary lamellae were evidenced in C. mrigala of privately operated pond.

Knowledge Management: Journal