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Manipulation of Species Composition in Small Scale Carp Polyculture to Enhance Fish Production

Muhammad Nasir Uddin
Dept. Fisheries Management, BAU, Mymensingh, Bangladesh

Md. Shahjahan
Dept. Fisheries Management, BAU, Mymensingh, Bangladesh

Md. Mahfuzul Haque
Dept. Fisheries Management, BAU, Mymensingh, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to know the changes in total fish production due to inclusion of GIFT (genetically improved farmed tilapia) in small scale carp polyculture for a period of 150 days. GIFT was included 0% (T₁), 20% (T₂), 30% (T₃) and 40% (T₄) of total number of fish. Formulated feed was given twice a day to the fishes at the rate of 2.5% of their body weight throughout the culture period. Temperature, pH, dissolved oxygen and alkalinity did not show any significant difference among the treatments whereas water transparency, depth, nitrate-nitrogen and phosphate-phosphorus varied significantly among the treatments. The highest plankton abundance was in T₄. The survival rate of GIFT was not significantly different among the treatments. The productions of rohu, catla, mrigal and Thai sharpunti did not significantly differ among the treatments but differed in GIFT. The combined highest productions of fishes were 1880 ± 13.00 kg ha^-1 in T4. From the findings of the present study it is concluded that inclusion of GIFT (up to 40%) in traditional mixed carp polyculture in small scale aquaculture ponds may increase the total production.

Keywords: GIFT tilapia, Polyculture, Aquaculture, Water quality, Fish production

Location: Mymensingh

Start Date: 02-07-2008

End Date: 28-11-2008

Program Area: Farming System

Commodity: Carp fish

Objectives:

To know the changes in production due to inclusion of GIFT strain of tilapia in traditional carp polyculture in small aquaculture ponds.

Methodology:

The experiment was conducted in four treatments each with three replications. In T₁: 10000 carps (catla, rohu, mrigal, Thai sharpunti) were stocked per hectare, T₂: 8000 carps (catla, rohu, mrigal, Thai sharpunti) + 2000 GIFT tilapia were stocked per hectare, T₃: 7000 carps (catla, rohu, mrigal, Thai sharpunti) + 3000 GIFT tilapia were stocked per hectare and T₄: 6000 carps (catla, rohu, mrigal, Thai sharpunti) + 4000 GIFT tilapia were stocked per hectare. The experiment was carried out for a period of 150 days from 2 July 2008 to 29 November 2008 in twelve equal sized rain-fed research ponds at Mymensingh. The ponds were treated with Lime (CaO) @ 250 kg ha^-1 and fertilized initially with urea, TSP and cow-dung @ 24.7, 24.7 and 620 kg ha^-1 respectively. The length and weight of 20% fingerlings were recorded before stocking in the ponds. Supplementary feeds were given daily to the fishes @ 2.5% of their body weight. The feed was given twice a day. Feed ration was adjusted through fortnightly sampling of fishes. Urea, TSP and cow-dung were applied at the rates of 25, 25 and 620 kg ha^-1, respectively every 10 days interval. Fish sampling was done fortnightly to observe the health condition of fishes and for feed ration adjustment. Length and weight of some fishes were measured at every sampling. After 150 days, fishes were harvested and counted for total number separately from each pond to evaluate the survival rate. After direct counting, weights of each species of fishes in different ponds were taken. A one-way ANOVA followed by Duncan’s Multiple Range Test (DMRT) was used to test the differences in growth and production among treatments. Analysis were done by using SPSS version-14.0.

Source of Information: Bangladesh J. Prog. Sci. & Tech. X(I): 009-012, January, 2012

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Combined production of rohu, catla, mrigal, sharpunti and tilapia was significantly higher in T₄. It indicates that if the stocking density of GIFT increases up to 40% in carp polyculture the growth rate is not hampered. On the other hand, if the stocking density of carp is increased in carp polyculture the growth is hampered and thus the production is not increased. We conclude that inclusion of GIFT (genetically improved farmed tilapia) strain of tilapia (40%) in traditional mixed fish polyculture in small scale aquaculture ponds may increase the total production.

Knowledge Management: Journal