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Abundance of Mosquito Larvae at Jagannath University and Dhaka University Campus of Dhaka, Bangladesh

Farzana Islam*
Department of Zoology, Jagannath University, Dhaka 1100, Bangladesh

Homaira Prithul
Department of Zoology, Jagannath University, Dhaka 1100, Bangladesh

Abstract/ Executive Summary:

A year-round survey on the abundance of mosquito larvae was conducted at Jagannath University - and Dhaka University - Campus from October 2018 to September 2019. A number of total 4415 mosquito larvae were collected of which 3086 were identified as Culex and 1329 were Aedes. Only 3 species belonging to 2 genera were identified in this study. At Jagannath University campus, highest number of Culex larvae was recorded in the month of August which was 167 (10.9%) and the lowest number was recorded in February which was 66 (4.3%), on the other hand, highest number of Aedes larvae was recorded in the month of July which was 137 (23.8%) and the lowest number was found in December which was 9 (1.6%). At Dhaka University campus, the highest number of Culex larvae was found in the month of April, which was 179 (11.5%) and the lowest number was found in June, which was 66 (4.3%), on the other hand, the highest number of Aedes larvae was found in the month of June which was 200 (26.5%) and lowest number was found in February which was 8 (1.06%). This study could be helpful in launching larvicidal programs in a more cost-effective way at these two urban public universities of Dhaka city.

Keywords: Aedes, Culex, Larvae, Monthly, Abundance.

Location: Conducted at Jagannath University - and Dhaka University - Campus

Start Date: 00-10-2018

End Date: 00-09-2019

Program Area: Pest Management

Commodity: Mosquito

Objectives:

The present study was undertaken to record the status of mosquito larvae as well as their breeding sites and determine the mosquito density & species variation for up to 12 months in both Jagannath University and Dhaka University campus.

Methodology:

Study area: The study was conducted from October 2018 to September 2019 at two university areas. The selected locations were- Jagannath University campus & Dhaka University, Curzon Hall area. The geographical location of Jagannath University Campus is 23°42’37” N to 90°24’40” with about 11 acre of land area, while the geographical position of University of Dhaka, Curzon Hall is 23.727389°N, 90.401902°E with about 215 acre of land area.

Identification of breeding sites of mosquitoes: The potential breeding locations were examined on a regular basis and drains along all buildings of both Universities were also checked for mosquito larvae.

Sample collection: The mosquito larvae were collected by standard dipping method (using dipper) on weekly basis from the two areas, i.e. in every month four surveys were conducted at each sites. While dipping, care was taken not to disturb the water too much as this may make larvae dive downwards.

Counting and preserving larva: After collection, the larvae were counted and the samples were preserved in 90%-95% ethanol.

Larval identification: The larvae were identified at the laboratory of the Department of Zoology, the University of Dhaka under a trinocular microscope using the taxonomic keys of Rattanarithikul et. al. (2005; 2006) and Ary and Dana (2013). After identification, the larvae were sorted under particular taxonomic groups.

Data analysis: The recorded data on mosquito larval density were tabulated and calculated on a monthly basis.

Source of Information: Bangladesh J. Zool. 49 (2): 321-329, 2021 ISSN: 0304-9027 eISSN: 2408-8455

Article Link (Online Journal): DOI: https://doi.org/10.3329/bjz.v49i2.56267

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In order to control the mosquito-borne diseases, it is necessary to know the status of the larval density and diversity and the timing of mosquito control operations For this purpose, it is essential to know the monthly mosquito larval population density of different areas of Dhaka city. Mosquito control programs should be launched on regular basis by the City Corporation, especially at those places where density of mosquito larvae is relatively high and actions should be taken during the months when the mosquito larval density remains quite low. More studies are needed to determine which factors were responsible for breeding and survival of the mosquito larvae at Jagannath University and Dhaka University (Curzon Hall) campus areas to prevent further mosquito larval population in these two important areas of Dhaka city. These actions might prevent higher outbreak of mosquitoes and mosquito-borne diseases in near future.

Knowledge Management: Journal