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Control of Copepodes in Artemia Ponds by Salinity Shock

S. Awai
Marine Biology Discipline,Khulna UniversityKhulna

M.S . Rahman
Marine Biology Discipline,Khulna UniversityKhulna

M.A. Rahman
Marine Biology Discipline,Khulna UniversityKhulna

Abstract/ Executive Summary:

A simple measure to control marine copepodes in Artemia ponds was neveloped through application of salinity shock. The desired level of salinity was determined through the application of different grades of salinity. It was observed that the grazing Artemia by copcpodcs started to reduce as the salinity level reached 45 ppt and at 75 ppt of salinity all the copcpodes were found to be completely eradicated.

Keywords: Copepode, Artemia, Salinity shock

Location: Artemia pond, situated within traditional salt beds besides the Bakkhalt river at Cox's Bazar

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Aquatic animal

Objectives:

To determine a level of salinity at which copepodes cannot survive.

Methodology:

The study was carried out in a modified Artemia pond, situated within traditional salt beds besides the Bakkhalt river at Cox's Bazar , where normal seawater entered accidentall y resulting in the decrease of salinity . lnitially, when the Artcmia nauplii was inoculated the salinity of the water was 70 ppt. After the seawater entered, the salinity came down to 30 ppt. Along wit h seawater numerous copepodes also entered into the Artemia ponds and started to graze on Artemia population. Then salinity of the Artemia pond water was raised by adding highly saturated brine solution from salt field . At each interval of the salinit y increase the number of Artemia and copepode population was counted and recorded. The salinity increase was stopped when no copepode was found in the A rtemia pond. The study was earned out for two weeks. During the study period the entrance of sea water into the Artemia pond was carefully stopped. Only highly saturated manured brine water was added to increase salinity of the Artemia pond. The physico-chemical pcirameters of the pond water were studied at regular intervals following standard methods. To test the null hypothesis (H_o) whether the correlation between the two populations, copepode and Artemie, is significant or not, the relevant statistical analysis was done.

Source of Information: Bangladesh J. Agril. Sci. 24 (1): 135 - 138, January 1997

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It is recommended that salinity shock may be used to eradicate copepode and other predatory animals from the Artemia pond which cannot survive in high concentration of salinity.

Knowledge Management: Journal