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Seasonal Abundance of Zooplankton and Growth Performance of Prawn and Fish in Ponds of Rajshahi

MAB Siddique
Department of Fisheries, University of Rajshahi, Rajshahi

M Afzal Hussain
Associate professor
Department of Fisheries, University of Rajshahi, Rajshahi

MA Hossain
Department of Fisheries, University of Rajshahi, Rajshahi

M Manjurul Alam
Department of Fisheries, University of Rajshahi, Rajshahi

Abstract/ Executive Summary:

The present study was conducted on seasonal abundance of phytoplankton of prawn based carp polyculture system fishponds for a period of six months from September 2006 to February in the village Meherchandi of Boalia thana under Rajshahi district of Bangladesh. During the study period, it was found that water temperature varied from 16.59°C (T₂) to 29.82 (T₁), transparency 26.72 (T₁) to 40.13cm (T₂), pH 7.21 (T₁) to 8.0 (T₂) DO 2.13 (T₂) to 3.6mg/l (T₂), CO₂4.63 (T₁) to 10.63mg/l (T₂), NH₃N 0.001 (T₁) to 0.0197mg/l (T₂) and total alkalinity fluctuated from 85.38 (T₁) to 147.75mgl (T₂). A total four groups of zooplankton were identified where 5 rotifera (38.41%) was dominant followed by 3 cladocera (31.49%), 2 copepoda (21.84%) and crustacean larvae (8.26%). It was also found that zooplankton showed abundance in February. The highest total average zooplankton (18390.79±2144.63 cells/l) was recorded in T₁ than T₂ which might be due to the effective uses by high stocking density of fishes. Zooplankton showed positive correlation with pH, DO, CO₂and alkalinity in T₁. In case of T₂, positive co-relationship was found with pH, DO, CO₂ and NH3-N. The mean values of highest final weight of M. rosenbergii, H. molitrix and C. catla were 89.20±8.62g (T₁), 682.70±44.20g (T₂) and 428.00±4.50g (T₁) respectively, highest survival rate was found 76.25±6.25% (T₁) of prawn and highest total average yield was obtained 940.65±259.43 kg/ha in T₂ due to high stocking densities of prawn.

Keywords: Zooplankton abundance, physico-chemical parameters, carp polyculture, growth performance

Location: Rajshahi district

Start Date: 01-09-2006

End Date: 28-02-2007

Program Area: Resource Development and Management

Commodity:

Objectives:

The present investigation has been undertaken on related to the title such as seasonal abundance of Zooplankton.

Methodology:

The present study was conducted in the village Meherchandi of Boalia Thana under Rajshahi district for a period of 6 months from September 2006 to February 2007. For this study, four ponds were selected under two treatments with an average area of 0.34 ha and depth of 1m. The ponds were rectangular in shape, well exposed to sunlight, independent and completely free from aquatic vegetation. The present experiment was conducted with two treatments each with two replications and every treatment was designed with M. rosenbergii, H. molitrix and C. catla. The stocking density of carp in each treatment was fixed (H. molitrix-2968/ha C. catla-1976/ha) but the stocking density of prawn was at the rate of 40/40m²(9880/ha) in Treatment 1 (T₁) and at the rate of 60/40m² (14820/ha) in treatment 2 (T₂). During the study period, all the ponds were limed at the dose of 250kg/ha after removal of aquatic weeds and unwanted species and fertilized with cowdung-2470kg/ha, urea-50kg/ha and TSP-50kg/ha before stocking. Shelter or refuges was made for prawn by the uses of dried branches of bamboo which covered minimum 5% area of each pond. After seven days of fertilization all the ponds were stocked with specific species and initial average length, weights and sizes of each species of fishes and prawns were recorded before realizing. Post stocking fertilization was made (cow dung-50kg/ha, urea-1.25kg/ha and TSP-1.25kg/ha) as daily basis. The supplementary feeds were applied twice daily for fish species with same feeding formulation (rice bran 20% + mustard oil cake 50% + fish meal 30%) at the rate of 5% of fish. The daily ration was adjusted based on the determination of total biomass through monthly sampling. Study of parameters The physico-chemical parameters were done fortnightly (8:30-9:30am). A centigrade thermometer used to recorded water temperature (°C). Measurement of water transparency (cm) was done by a secchi disc of 15.5cm diameter. pH was measured by a pH indicator paper (LOGAK, Korea). DO was determined by the Winkler’s titration method (APHA, 1989). Free CO2, NH₃-N and total alkalinity was determined according to Welch (1948). For zooplankton study, 20 liters of water sample from each pond was collected (8:30-9:30am) in a plastic bucket fortnightly and passed through plankton net of 55μ mesh size. Then the concentrated plankton samples were preserved in plastic vials with 5% formalin for subsequent studies. For the qualitative and quantitative study of plankton, 1ml of the concentrated samples was taken by a dropper and then put on the S-R (Sedgwick-Rafter) counting chamber as described by Stirling (1985). Zooplankton were identified up to genus level following keys were given by Ward and Whipple (1954), & Needham & Needham (1962). Statistical analysis was done through SPSS programme and means were also compared to see the significant difference.

Source of Information: Univ. J. Zool. Rajshahi. Univ. Vol. 29, 2010 pp. 09-16

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Final weight, survival rate and yield of different fish species under different treatments. During the study period maximum final weight (g) of M. rosenbergii, H. molirix, and C. catla was recorded as 89.20 (T₁), 672.70 (T₂) and 428.00 (T₁) respectively. The highest value of survival rate (%) was recorded as 76.25 (T1), 74.99 (T1) and 68.75 (T2) for these species respectively, which was higher than the findings of Alam et al. (2001) who recorded 62.50% survival rate of M. rosenbergii and 96.42% of H. molitrix. The maximum yield (kg/ha) was recorded as 851.53 (T₂), 1496.60 (T₁) and 542.53 (T₂) where total highest average yield (kg/ha) was recorded for these species as 940.65 in T₂ due to high stocking density of prawn.

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