Diseases of Pangasius and catfish deteriorate production and benefit. Diseases of Pangasius and catfish are main obstacle of culture. Pangasius culture has become main fish culture in Bangladesh mainly northern part. Diseases of pangasius and catfish caused by viruses, bacteria, fungi, parasites, and other pathogens. The cost of disease prevention and treatment is 5 to 5.5% of total production cost (Dung et al., 2008; Hung and Huy, 2005; Khoi et al., 2008). Farmer use
antibiotic for treatment of fish diseases.
The results of the multiple-case study show that most farmers do not know exactly what kind of antibiotics they should use during disease outbreak (Khoi et al., 2008). Small farmer know about fish diseases from friend and different drug dealer. In many cases, local veterinary drug suppliers have no knowledge in either aquatic organisms or veterinary drugs (Khoi et al., 2008). Continue reading Diseases of Pangasius and catfish→
The study was conducted to collect and identify the ectoparasites and endoparasites of Channa punctatus (Bloch, 1793) from different water bodies of Rajshahi district during June 2011 to April 2012. Samples were collected from different fish markets and in some cases directly from fishermen of Rajshahi city. A total of 373 fishes were examined during the study period of which 251 fishes (67.29%) were infected. Organ wise distribution, monthly, seasonally, sex and length groups wise fluctuation of prevalence, abundance and mean intensity of parasites were studied. A total of 8 different parasitic genera were collected from the host fishes. Among them 5 were ectoparasites and 3 were endoparasites. Of these five ectoparasites one was protozoan Trichodina pediculatus, and two monogenic parasites Dactylogyrus vastator and Gyrodactylus elegans, one annelid was Hirudu medicenalis and one crustacean Argulus foliaceus. Three endoparasites were Ascaridia sp. nematodes one trematodes Genarchopsis sp and acanthocephalan pallisentis sp. Highest parasitic infestations were found in intestine, second highest was found in gill and the lowest was found in skin and stomach. Parasitic infestation fluctuated from months to months. Highest parasitic infestation was found in November and the lowest in June. The host fishes showed highest prevalence value and highest abundance value in autumn season. The host fishes showed their lowest prevalence and abundance value in winter season. Parasitic infestation was found to vary with size groups and sex groups. It was noted that the hosts of intermediate length and weight groups were found to be more infected than smaller and larger length group. Females were more infested than the males.
This is a protozoan parasite. Body dorsoventrally flattened. Dorsal surface convex and ventral surface flat. Several paralle, arching rows of cilia on ventral surface. Oral basket protrusible, conspicuous, opening on anterior part of ventral surface. Length 21.3 – 41.7 µm and width 13.3 — 38.6 µm. The disease caused by Chilodonella sp. called Chilodoneliasis.
Ichthyophthirius sp. is a Protozoan parasite. Body is oval shaped but it can change its shape to considerable extent if necessary. Diameter was 37.2— 68.9 p.m. The body bears a large number of cilia over the whole surface area. It has a tubules mouth. Both micro and macro nucleus are present. The nucleus is horse shaped and rotating in nature. The disease caused by Ichthyophthirius sp. called ich or white spot or ichthyophthiriasis disease
Pallisentis sp. is a “spiny-headed” worms isolated from skin and fin of different fishes. Body shows externally three recognizable regions: i) the proboscis ii) neck and iii) the trunk. Proboscis is a hollow, subglobular to cylindrical structure, always armed with a set of posteriorly pointing hooks. It is a retractable. The neck is short and behind the proboscis, it is never armed. The trunk is a sack like structure, straight or curving. Body length 8.0—30.5 mm and width 0.3—0.5 mm. The disease caused by Pallisentis sp. called pallisentiosis.