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Effect of Different Stocking Densities on Growth and Survival of Nandus Nandus Fry in Earthen Pond

Nilufa Begum
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna, Bangladesh.

MH Pramanik
Revarine Station, Bangladesh Fisheries Research Institute, Mymensingh, Bangladesh.

Yahia Mahmud
Head Office, Bangladesh Fisheries Research Institute, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

Twenty days old fry were reared for 45 days with three stocking densities having three replications to know the effect of densities on growth and survival of Nandus nandus fry in earthen pond. Experiment was designed with three stocking densities such as T₁ = 80 nos/m², T₂ =100 nos/m² and T₃=120 nos/m². The water quality criteria of the experimental pond were suitable to fish culture. After 45 days of rearing the ponds were harvested and percent weight gain was obtained 380.38 ±50.92, 275.76 ± 40.37, and 237.50± 33.96 in T_1, T_2, and T₃ respectively. Survival rate obtained 68, 62, and 55 in T_1, T_2, and T₃ respectively. The present experiment was undertaken as lower stocking densities showed a higher growth rate and survival %.

Keywords: Nandus nandus fry, Stocking densities, Experimental ponds

Location: Sub-station Santahar, Bogura in Bangladesh.

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

To determine the optimum stocking for the culture of Nandus nandus.

Methodology:

20 days old fry having 2.1 ± 0.24 cm length & 0.52 g weight were carefully reared for 45 days with different stocking densities to know the effect of densities on growth and survival of Nandus nandus fry in flood plain sub-station Santahar, Bogra. The fish were acclaimed 3 days before starting the experiment. There were three treatments with three replications. They were designated as T₁ = 80 nos/m², T₂ =100 nos/m², T₃=120 nos/m². Nine ponds (each 5 decimal) were prepared by drying, excavation, and liming @1 kg /decimal and urea, TSP & cow dung @ 0.100kg, 0.075kg & 8kg/decimal. Before starting the experiment ponds were drained to eradicate all fishes and ponds were encircled with nylon nets. The pond embankment was also repaired. To produce zooplankton mustered oil cake, cow dung, flour was provided before stocking of fry. Fry was fed with fine rice bran (25%) mustered oil cake (25%) and fish meal (50%) or brand nursery feed @ 6%-12% of estimated body weight, Tubifex, and small fishes at the same daily ration. The ponds were sampled fortnightly by using a nylon net to determine growth rate as well as feed adjustment. Water temperature, pH, ammonia, and nitrate-nitrogen were routinely monitored. After 45 days of rearing all fish were harvested through seine netting and drying. During harvesting, fishes were counted and weighed from each pond to assess the survival rate and production. The data obtained from the experiment were analyzed by DMRT (Duncan’s Multiple Range Test) with way analysis of variance (ANOVA).

Source of Information: International Journal of Fisheries and Aquatic Research- Volume 3; Issue 3; July 2018; Page No. 05-07

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Although well growth and survival at high stocking densities will not only result in high profitability but also reduce the area of ponds required for the culture of fish, moreover almost all species achieved higher growth in low stocking density. Well, the growth & survival rate of Nandus nandus fry would be found in low stocking density. In the experiment, it was clear that survival rate, Growth and Dissolve oxygen were inversely related with the higher stocking densities of Nandus nandus fry. In the experiment pH, Temperature, Nitrate nitrogen, Total alkalinity, and Ammonia were satisfactory to fish culture. All experimental ponds of the present research were productive.

Knowledge Management: Journal