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Polyculture of Carps Using Over-wintered Fingerlings Under Different Stocking Densities

M. J .Alam.
Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh

M.A. Mazid
Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh

M.S. Islam
Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh

A.H.M. Kohinoor
Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh

Abstract/ Executive Summary:

At on-farm trial was undertaken in twelve earthen ponds (1200-1600m²) to evaluate the growth and production of over-wintered fingerlings of rohu (Labeo rohita) catla (catla catla) and mrigal (Cirhous mrigala) in polyculture at three stocking densities. The stocking densities were 2,250; 3,250 and 4,250 fish/ha in treatment-1, treatment-2 and treatment-3, respectively. Fish in all ponds were fed with rice bran and mustard oil cake at the ratio of 3:1. Fish production obtained in three treatments were 2,325±74.25, 2,620±49.66 and 2,982±171.52 kg/ha. The results demonstrated higher mean growth in T-1 than in T-2 and T-3. A net benefit of Tk. 93,755 was obtained from T-3, followed by Tk.89,602 and 87, 971 from T-1 and T-2, respectively. However, the highest production as well as net benefit was obtained in treatment-3.

Keywords: Polyculture, Over-wintered, Stocking density

Location: Boilor Union, Trishal, Mymensingh

Start Date: 00-04-2001

End Date: 00-10-2001

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To observe the adoption of this management technique and explore the possibilities of density effects on the production of carp with maximum individual weight and per capita maximum yield in a polyculture system using fingerlings reared over the winter period at high level stocking density with low input.

Methodology:

Pond preparation: The experiment was conducted in 12 perennial ponds of 1200 to 1600 m² each at Boilor Union, Trishal, Mymensingh during the period of April to October 2001. Before stocking rotenone was used at the rate of 7500/kg /ha in all experimental ponds to eradicate the all sorts of fish species. Ponds were then treated with lime at the rate of 250 kg/ha. Five days after liming, ponds were fertilized with cow dung at the rate of 1000kg/ha. Stocking of fish: Over wintered fingerlings (fry reared in a nursery pond at 200000 fish/ha from September 2000 to February 2001, covering the winter season) were stocked 3 days after fertilization. The experimental ponds were divided into three treatment groups for three stocking densities of 2000(T-1); 3000 (T-2) and 4000/ha (T-3) with rohu, catla and mrigal at the ratio of 1:1:1 Grass carp was stocked in all treatments at the density of 250 individuals/ha as an additional species.Post stocking management: All treatment groups were subjected to the same regime of feed application. Supplementary feed was prepared using commonly available feed ingredients viz. rice bran and mustard oil cake at the ratio of 3:1. The prepared semi-moist feed was supplied to the stocked fishes regularly at the rate of 2-3% of the standing crop of fish. A sufficient amount of green soft grass and banana leaves was supplies regularly for feeding grass carp. The ponds were sampled monthly by using a seine net for weighing approximately 20% of the fish of each species to measure the growth, assess the health status and adjust the amount of feed. Analysis of water quality parameters: Water quality parameters like water temperature, dissolved oxygen (mg/l), pH and total alkalinity (mg/l) were monitored weekly at around 9.00-10.00 am. Standard procedures were followed in analyzing the water samples. Enumeration of Plankton: Plankton samples were collected monthly from the experimental ponds. Identification and enumeration of plankton were performed. Harvesting of fish: After seven months, all ponds were harvested through repeated seine netting and lastly by draining out of water. After harvesting, the number of fish harvested, species, individual weights and gross weight were recorded to estimate the survival rate and production. Statistical Analysis: Data were analysed using ANOVA (one way) followed by Duncan’s Multiple Range Test (DMRT) to identify the level of variation among the treatments.

Source of Information: Bangladesh J. Fish., Res., 6(2):117-124, 2002

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest production as well as net benefit was obtained at a stocking density of 4,250 fish/ha in treatment-3 (T-3).

Knowledge Management: Journal