Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Effect of Urea and Malathion on the Freshwater Prawn, Macrobrachium Lamarrei (h.m. Edwards)

Anjuman Ara Ali
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

M. A. Mannan
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Selina Parween
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

The agrochemicals significantly reduced survivability rate of the broods. It was decreased to 31.94% in 10% urea and 0% in 6ppm malathion. It was observed that in tap water, broods released their eggs when they were kept longer than 72 hours. Wherever, in urea or malathion solution eggs in the berry were failed to develop, and dropped in the water as unhatched condition. The broods laid different number of eggs in tap and mineral water, urea and malathion solutions. Hatching percentage eggs did not differ singnificantly between tap water (84.07%) and mineral water (82.83%). However, concentration of 8% urea and 4ppm malathion reduced hatching significant.

Keywords: Agro-chemical, Berried, Survivability, Hatchability

Location: Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Prawn

Objectives:

To assess the effect of urea and malathion, on the survivability of broods and eggs of the freshwater prawn Macrobrachium lamarrei (H.M.Edwards) in the laboratory.

Methodology:

Brood stocks of M. lamarrei were maintained in the Aqua-lab of the Department of Zoology, Rajshahi University. The experimental broods (mature unsexed prawns) were collected from the stock and acclimatized in aquarium with tap water and 24 hour aeration. Eggs were carefully collected from stage IV berried females (eggs with eye spots) and placed in tap water in 500 ml glass beakers with aeration. Commercial urea and malathion at required quantities were separately dissolved in 13 litre distilled water to prepare concentrations of 6, 8 and 10% of urea and 2, 4 and 6ppm of malathion . These concentrations of chemicals were chosen from the survivability screening in pilot experiments. Egg hatchability was tested in commercial mineral water and laboratory tap water, 8% urea and 4ppm malathion.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 26, 2007. pp. 107-108

Article Link (Online Journal): http://journals.sfu.ca/bd/index.php/UJZRU

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present results revealed that residual effect of urea and malathion, both are hazardous against the brood of M. lamarrei and inhibit the completion of embryogenesis of their eggs. More detailed study is essential regarding the effect of agro-chemicals on the growth, development and reproduction of prawn.

Knowledge Management: Journal