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

A Study on the Abundance of Zooplankton of a Culture and a Non-culture Pond of the Rajshahi University Campus

Sharmeen Rahman
Department of Fisheries, University of Rajshahi, Rajshahi

M. Afzal Hussain
Department of Fisheries, University of Rajshahi, Rajshahi

Abstract/ Executive Summary:

Zooplankton constitute important food item of many omnivorous and carnivorous fishes. The study was conducted with an aim to study the zooplankton production including physico-chemical parameters with an emphasis to the existing management practices taken by the operators. The study was carried out in a culture and a non-culture pond of Rajshahi University campus was carried out from September, 2004 to February, 2005. Monthly fluctuations of some physico-chemical parameters were noted. The ponds showed alkaline in nature with moderate bicarbonate alkalinity. Diurnal change of water temperature, free CO₂ and dissolved Oxygen were also studied. Four groups of zooplankton were identified, of which copepods (1260 units/l and 973.33 units/l in pond-1 and pond-2 respectively) were most dominant. A total of 9 genera of zooplankton were identified of which Cyclops (68.25% and 60.28% of total copepods) was most abundant in both ponds. Total zooplankton showed positive correlation with pH, carbonate alkalinity (CO₃) and bicarbonate alkalinity (HCO₃) in both ponds and DO, carbon dioxide (CO₂) in pond-1. Present findings indicated that the culture pond showed better result than that of the non-culture pond regarding zooplankton production.

Keywords: Zooplankton, Culture pond, physico-chemical parameters

Location: Rajshahi

Start Date: 30-09-2004

End Date: 28-02-2005

Program Area: Resource Development and Management

Commodity:

Objectives:

The purpose of the present investigation is to study the changes in the zooplankton production including the physicochemical parameters with an emphasis to record the existing management practices operated by the pond owners in the two ponds.

Methodology:

Two perennial ponds are selected for the present study. The first pond (culture pond) is managed properly and leased out to a local fish farmer .The pond is rectangular in shape and has an area of 297 decimel with an average depth of 8 feet, which varies throughout the year. The second pond (non-culture pond) is under the supervision of Fisheries department. It has an area of 1 acre with an average depth of 3 feet and irregular in shape. It is not managed culturally During prestocking management farmers manually clean aquatic weeds and use “Quickfume” and “Sumithion” at the rate of 2000 tablets/ha and 75050 ml/ha respectively for removing predatory fish. Lime is applied at the rate of 375kg/ha during pond preparation. Cowdung, TSP and Urea were applied at the rate of 1125.70kg/ha, 281.43kg/ha and 187.62kg/ha respectively. In the culture pond the stocking density of Rohu( Labeo rohita), Catla (Catla catla), Mrigal (Cirrhinus mrigala), Silver carp(Hypophthalmicthys molitrix), Bighead carp (Aristichthys nobilis), Grass carp (Ctenopharyngodon idella) and Sarpunti (Puntius gonionotus) was 855 individual/ha, 427 individual/ha, 513 individual/ha, 294 individual/ha, 187 individual/ha, 168 individual/ha and 312 individual/ha respectively Analysis of water quality and plankton sampling was done fortnightly three times a day (morning 7am, noon 12 pm, and evening 5pm), from 4 points of the pond at a depth of 20cm below the surface. A centigrade thermometer was used to measure water temperature. Transparency (cm) was measured with a secchi disc of 15.5cm diameter. pH was measured by a digital pH meter (model-98107, Made in Mauritius). DO was measured by Winkler’s Titration method (APHA, 1989). CO₂, CO₃and HCO₃ alkalinity was measured by titration method (Welch, 1948 Ten liter water was collected from different points and depths of the pond and filtered through a 25μm mesh plankton net to sample the experimental plankton. The sample was preserved in Transeau’s solution. Analysis was done on a Sedgwick-Rafter counting cell, under an Olympus light microscope, model CX₂1FS₁_.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 35-41 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In pond-1, zooplankton showed positive correlationship with pH, DO, CO₂, CO₃ - and HCO₃ . In pond- 2, positive correlationship between zooplankton density and pH, CO₃ - and HCO₃ - concentration was observed. Zooplankton showed negative correlationship with water temperature, transparency in both ponds and DO, CO₂ in pond-2 . It can be concluded that the present findings indicated that the culture pond showed better result than that of the non-culture pond regarding zooplankton production

Knowledge Management: Journal