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Effect of Stocking Ratio on the Growth and Production Performance of Silver Carp and Catla in Mola-carp Polyculture System

M.E. Ahsan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

M.L. Rahman
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202

A.K. Sen
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

M.M. Hasan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

M.R. Haque
Department of Fisheries Management, HSTU, Dinajpur

M.R. Haque
Department of Fisheries Management, HSTU, Dinajpur

Abstract/ Executive Summary:

An experiment was conducted to optimize the stocking ratio of silver carp and catla in mola-carp polyculture system at the department of Fisheries Management, Bangladesh Agricultural University, Mymensingh from November 2006 to March 2007. The experiment consisted of three treatments with three replications per treatment. All ponds (100 m²) were stocked with Silver carp (Hypophthalmichthys molitrix) and catla (Catla catla) @ 30 and 10 (3:1); 20 and 20 (1:1); and 10 and 30 (1:3) in treatment T₁ T₂ and T₃ respectively. In addition, 40 rohu (Labeo rohita), and 100 mola (Amblypharyngodon mola) were also stocked. Supplementary feed was applied daily @ 1.5% body weight of fishes throughout the study period. A number of water quality parameters such as temperature (°C), transparency (cm), pH and dissolved oxygen (mg/l) were monitored weekly and were within the suitable ranges for fish culture among all the treatments. The rate of survival of large carps ranged from 83 to 100% and was not affected by the presence of mola and/or SIS. The individual growth of catla was significantly higher (P<0.05) in treatment T₁ whereas, silver carp growth was significantly lower. Moreover, growth of silver carp was significantly higher (P<0.05) in both treatment T₂ and T₃, where growth of catla was significantly lower. It might be due to a negative or minor severe inter-specific food competition occurred between silver carp and catla. Total mean yields of fish recorded were 685±128, 735±135 and 653±50 kg/ha/120 days in treatment T₁ T₂ and T₃ respectively.

Keywords: Growth, Stocking ratio, Water quality, Silver carp and Catla

Location: Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 00-11-2006

End Date: 00-03-2007

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To determine the stocking ratio, growth and production performance of silver carp and catla in mola-carp polyculture system.

Methodology:

The experiment was carried out for a period of four months from November 2006 to March 2007 at the department of Fisheries Management, Bangladesh Agricultural University (BAU), Mymensingh. Nine earthen ponds with an area of 100 m² (0.01 hectare) each and an average depth of 1.5 m were used for this study. The trial was conducted in a completely randomized block design (RCBD) into three different treatments with three replications. Three different stocking ratios of silver carp (Hypophthalmichthys molitrix) and catla (Catla catla) were compared. Stocking ratios of silver carp and catla were 3:1, 1:1 and 1:3 in treatment T₁, T₂ and T₃, respectively whereas, rohu and mola were stocked @16 and 40 fish/dec. All ponds were drained out and prepared by removing weeds, predators and other fishes from the ponds. Afterwards, the ponds were treated with agricultural lime @ 2.5 kg/pond (250 kg ha^-1). To promote algal growth ponds were fertilized with organic and inorganic fertilizers. Urea, TSP (Triple Super Phosphate) and cowdung were applied @ 250g, 250g and 7.5 kg/pond (750 kg/ha) respectively. Commercial feed (Saudi-Bangla fish feed) was applied daily @ 1.5% body weight of large fishes in each pond twice daily and all ponds were fertilized with organic (cow manure) and inorganic fertilizer (urea and TSP) in each 15 days interval. A number of water quality parameters such as temperature (°C), transparency (cm), pH and dissolved oxygen (mg/l) were recorded weekly using a commercial kit box (Model: FF-3, USA). Fishes were sampled monthly by using a seine net. Weight of 10 fishes of each species was measured separately to assess the health condition and growth of fishes using a portable balance (OHAUS, model No.CT-1200-S). Partial harvesting of fishes was performed by repeated netting, using a seine net. Final harvesting was done by de-watering the ponds. During harvesting all fishes of each pond were collected and weighed individually to assess the survival rate and production. Specific growth rate (SGR) was estimated as; SGR = [Ln (final weight)-Ln (initial weight) x 100]/ culture period (days). Survival and production of fish were measured. For the statistical analysis of the data, a one-way ANOVA (Analysis of Variance) and DMRT (Duncan’s Multiple Range Test) were done by using the SPSS (Statistical Package for Social Science) version-11.5 and the significance was assigned at 5% level.

Source of Information: J. Agrofor. Environ. 3 (1): 147-150, 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The revealed that, rate of survival of large carps ranged from 83 to 100% and was not affected by the presence of mola and/or SIS. The individual growth of catla was significantly higher (P<0.05) in treatment T₁ whereas, silver carp growth was significantly lower. Moreover, growth of silver carp was significantly higher (P<0.05) in both treatment T₂ and T₃, where growth of catla was significantly lower. It might be due to a negative or minor severe inter-specific food competition occurred between silver carp and catla. Total mean yields of fish recorded were 685±128, 735±135 and 653±50 kg/ha/120 days in treatment T₁ T₂ and T₃ respectively.

Knowledge Management: Journal