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Effect of Inorganic Fertilizer on the Fish Growth and Production in Polyculture System of Bangladesh

M. A. Sayeed
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

M. T. Alam
Institute of Biological Sciences, University of Rajshahi, Rajshahi

S. Sultana
Department of Fisheries, Matshya Bhaban, Ramna, Dhaka

M. S. Ali
Department of Fisheries, Matshya Bhaban, Ramna, Dhaka

M. S. Azad
Department of Fisheries, Matshya Bhaban, Ramna, Dhaka

M. A. Islam
Department of Fisheries, Matshya Bhaban, Ramna, Dhaka

Abstract/ Executive Summary:

A study was carried out on the optimal dose of inorganic fertilizer used in carp polyculture system over a period of 10 months. Three treatments were assigned: without inorganic fertilizer, with the application of 100 kg/ha/month inorganic fertilizer and 150 kg/ha/month inorganic fertilizer as T₁, T₂and T₃, respectively. Each treatment had three replications. The selected indigenous carp species were Rui (Labeo rohita), Catla (Catla catla) and Mrigal (Cirrhinus mrigala), and exotic carp species were silver carp (Hypophthalamichthys molitrix), grass carp (Ctenopharyngodon idella), common carp (Cyprinus carpio) and thai sarpunti (Barbodes gonionotus). The average water area of the experimental ponds was 0.11± 0.01 ha and average depth of water in all ponds was 1.26 m. The treatments showed no effect on water temperature, dissolved oxygen, alkalinity and pH. The fish production was significantly higher (P>0.05) in both the treatments T₂ and T₃ than that of T₁ where no inorganic fertilizer was used. But there was no significant difference between T₂ and T₃ and T₂ was with lower dose inorganic fertilizer (100 kg/ha/month) than T₃. Therefore, 100 kg/ha/month inorganic fertilizers may be suggested in carp polyculture system for better production.

Keywords: Inorganic fertilizer, optimal dose, Polyculture, Fish production.

Location: Bhangura upazilla under Pabna district

Start Date: 01-06-2005

End Date: 31-03-2006

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

The present study was carried out to determine the optimal dose of inorganic fertilizer used in carp polyculture.

Methodology:

The experiment was undertaken in Patulipara village at Bhangura upazilla under Pabna district from June 2005 to March 2006. Nine ponds were taken for three treatments each with three replicates. The average area of the ponds was 0.11± 0.01 ha. (Mean± SE). The experimental ponds were designated as T₁: T₁R₁ -T₁R₃ with supplementary feed at the rate of 2.5- 8% body weight daily and cow dung at the rate of 2,000 kg/ha/month, T₂_: T₂R₁ - T₂R₃with same feed and organic manure plus 100 kg urea and T.S.P/ha/month in the same ratio and T3: T₃R₁-T₃R₃ in addition of same supplementary feed and organic fertilizer 150 kg urea and T.S.P./ha/month in the same ratio was used (each fertilizer was used in every alternative weeks). The ponds were prepared by repairing the dikes and drying pond bottom in the sunlight for a week and liming at a rate of 250 kg/ha. When water increased by rainfall up to 0.61-0.91 meter, water colour became lighter, then cow-dung and inorganic fertilizer were applied at two days interval. After five days all the ponds were stocked at the rate of 6,000 fry/ha with a composition of 30% silver carp, 10% catla, 20% rui, 25% mrigal, 10% grass carp and 5% carpio. In addition 2,000 fry/ha Thai sarpunti were also stocked fry were fed daily with a mixture of fine rice bran, wheat bran and mustard oil cake at the ratio of 1:1:1 from the second day. Supplementary feed was applied at a rate of 8% body weight of the fry up to 15 days beginning from the first day, then 5% up to two months and finally 2.5% of the body weight until the fish harvest. The fishes were sampled once in a month to observe and record the growth. The water quality parameters (temperature, dissolved oxygen (DO), pH and alkalinity) of the experimental ponds were also recorded at the time of sampling. For statistical analysis, comparison of treatment means using one-way analysis of variance (ANOVA) followed by Duncan’s Multiple Range Test (DMRT) was performed to compare the different treatment means at 5% level of significance. Statistical analysis was performed using the SPSS (windows version 11.5) software package.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 26, 2007. pp. 77-80 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It is observed that carp polyculture using inorganic fertilizer in Bangladesh is a widely used practice of fish production whereas the actual dose of inorganic fertilizer for optimum production of natural feeds are still in the darken condition. Therefore, the production of aquaculture in a unit area is poor comparing to other neighboring countries. Moreover, farmers do not have enough money to invest in this sector. For maximum yield in a polyculture system with comparatively low cost, the optimal dose of inorganic fertilizer used here in treatment T₂ (100 kg/ha/month) can be recommended in pond polyculture

Knowledge Management: Journal