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Ecology and Abundance of the Common Indian Apple Snail Pila Globosa (swainson) in Rajshahi

B. K. Saha
Department of Zoology, Netrakona Government College, Netrakona, Bangladesh

M. A. Hossain
Department of Zoology, University of Rajshahi, Rajshahi, Bangladesh

M. S. Jahan
Department of Zoology, University of Rajshahi, Rajshahi, Bangladesh

Abstract/ Executive Summary:

The ecology viz. physico-chemical parameters, aquatic vegetation and abundance of the freshwater prosobranch, Pila globosa in different waterbodies of Rajshahi University campus was studied. The physico- chemical factors viz. water temperature (27.5 ± 0.1ºC of ponds, 25.89 ± 0.07ºC of ditches and 30.13 ± 0.06°C of irrigated paddy fields), water transparency (41.5 ± 0.5 cm of pond and 38.5 ± 1.5 cm of ditch), rainfall (114.56 ± 8.81 mm of ponds, 128.69 ± 15.55 mm of ditches and 204.64 ± 9.47 mm of irrigated paddy fields), sunshine (6.82 ± 0.60 hours of ponds, 6.39 ± 0.67 hours of ditches and 5.53 ± 0.78 hours of irrigated paddy fields), pH (7.81 ± 0.03 of ponds, 7.79 ± 0.01 of ditches, 7.96 ± 0.03 of irrigated paddy fields), dissolved oxygen (5.33 ± 0.41 mg/L of ponds, 2.98 ± 0.12 mg/L of ditches and 4.95 ± 0.02 mg/L of irrigated paddy fields) and carbon dioxide (4.75 ± 0.71 mg/L of ponds, 14.07 ± 0.53 mg/L of ditches and 5.6 ± 0.03 mg/L of irrigated paddy fields) were recorded. Aquatic vegetation includes submerged hydrophytes (3 spp.) free floating (7 spp.) floating but rooted (9 spp.) and amphibious (16 spp.). the maximum abundance of P. globosa per m² was 14.5 ± 2.5 in October 1995 and 1996, respectively.

Keywords: Aundance, Vegetation, Limnology, pH, Hydrophytes

Location: Meteorological Department, Rajshahi

Start Date: 00-01-1995

End Date: 00-12-1996

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

To obtain detailed information on the nature of habitat with their physico-chemical factors and aquatic vegetative condition and abundance of P. globosa in ponds, ditches, and irrigated paddy fields of Rajshahi University Campus.

Methodology:

The study on physico-chemical factors, aquatic vegetative condition of ponds, ditches and irrigated paddy fields and abundance of snails to establish the ecology of P. globosa was carried out in January 1995 to December 1996 followed by random sampling methods. Fortnightly, water samples were collected from the sampling areas in the morning (8:00 am) and in the afternoon (5:00 pm) and randomly 3 pockets, each of 1m² area in every habitats were demarcated for the collection of snails. All the vegetations and the upper most layer of the substratum (2 cm) were picked up and flooded with water in a tray. Snails found were collected and sorted out. Only the live snails were counted. Mean values of such 3 readings were considered as the actual abundance of P. globosa. The water temperature was recorded with a mercury thermometer (1ºC to 50ºC) on the sampling spot. The monthly meteorological data on the rainfall and sunshine were collected from the Meteorological Department, Rajshahi. For the chemical analyses, water samples were collected from the sampling areas and brought to the laboratory within a short time. pH of water was recorded with the help of water quality checker Dissolved oxygen were determined using Alsterber (azide modification of the Winkler method). Free carban dioxide was measured by titration using phenolphthalein as indicator.

Source of Information: Progress. Agric. 15(1) : 189-194,2004, ISSN 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present observation reveals that the annual air temperature cycle maintains a close parallel relationship with the annual cycle of water temperature. The temperature of all the water bodies studied usually declined from November and reached minimum in December and there after increase steadily reaching maximum during April to September. Maximum water temperature during summer months was reported in Dhaka and minimum water temperature during winter concluded that the chief considerations for aquatic molluscs were clean and transparent water in Britain. Maximum and minimum values of transparency had been found in May and August, respectively in ponds during the present work.

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