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Prevalence of Ectoparasites of Carp Fingerlings at Santaher, Bogra

M. D. Hossain
Department of Fisheries, Rajshahi University,

M. Kabil Hossain
Institute of Biological Sciences, Rajshahi University

M. Habibur Rahman
Department of Zoology, Rajshahi University,

A. Akter
Institute of Biological Sciences, Rajshahi University

D. A. Khanom
Department of Fisheries, Rajshahi University,

Abstract/ Executive Summary:

The research work was conducted to find out the seasonal prevalence of ectoparasites of carp fingerlings. Seven species of parasites viz. Trichodina domerguei, Trichodina reticulata, Chilodonella cyprini, Myxobolus koi, Dactylogyroides tripathi, Dactylogyrus extensus and Dactylogyrus catlarius were recovered from 640 fingerlings of Silver carp (Hypophthalmicthys molitrix), Bighead carp (Ctenopharyngodon idella), Common carp (Cyprinus carpio), Thai punti (Puntius gonionotus), Catla (Catla catla), Rui (Labeo rohita) and Mrigal (Cirrhina mrigala) from different nursery ponds of Bogra district during June 2005 to May 2006. The highest prevalence (95%) was in Trichodina domerguei and lowest (10%) in Dactylogyrus catlarius during winter season. Average prevalence of protozoan and monogenean parasite was 37.16 in rainy season, 40.08 in winter season and 30.25 in summer season. Winter is the most disease occurring season of the year.

Keywords: Ectoparasite, infestation, prevalence, fingerling, nursery pond

Location: Bogra

Start Date: 01-06-2005

End Date: 31-05-2006

Program Area: Resource Development and Management

Commodity: Carp fish

Objectives:

The present study was designed to investigate the prevalence, host specificity, infestation of ectoparasite in carp fingerlings of Bogra districts, Bangladesh.

Methodology:

The carp fingerlings of Hypophthalmicthys molitrix, Ctenopharyngodon idella, Cyprinus carpio, Catla catla, Labeo rohita, Cirrhinus mrigala and Puntius gonionotus were used as host fishes for the collection of ectoparasites and their identification. The study was conducted from June 2005 to May 2006 in Bogra district and a total of 640 carp fingerlings was observed for ectoparasites. In order to observe seasonal changes, the infected fishes were collected seasonally and immersed in 5% neutral formalin for preservation. The parasites were fixed according to the method suggested by Cable (1958). Monogenean parasites were identified following Yamaguti (1963). For identification of protozoan parasites Lom (1960), Lucky (1971) and Kabata(1985) were followed. The prevalence was calculated as number of infested fish divided by number of observed fish multiplied by hundred. The water quality parameters viz., water temperature, alkalinity, ammonia, free CO₂, dissolved oxygen, PH and total hardness were measured seasonally with the help of kit box. All recorded data were analyzed to calculate the prevalence of ectoparasites. The effect of locality and seasons were analyzed in terms of the percentage of parasites present.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 17-19 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Fish fingerlings become more susceptible to pathogen because of their immature immune system. prevalence of Trichodina domerguei and Dactylogyrus catlarias were found highest. The fingerlings required more O₂. During winter the water volume of fish habitat become reduced and water quality parameters deteriorates during this period. So fingerlings become suffocated due to lake of O₂ in water. Often the density of fingerlings remains higher in nursery pond. As a result water become polluted. So variety of diseases appear in nursery pond caused by ectoparasites. The value of water quality should be maintained properly to avoid the appearance of parasites in nursery pond.

Knowledge Management: Journal