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Mixed Culture of Fishes in Seasonal Ponds Through Fertilization and Feeding

M.A. Hossam
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. N. Islam
Department of Fisheries Technology, BAU, Mymensingh

M. Kamal
Department of Fisheries Technology, BAU, Mymensingh

M. Ahmed
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A study on mixed culture of mirror carp (Cyprinus carpio Lin.), tilapia (Oreochromis niloticus Lin.), silver carp (Hypophthalmicthys molitrix Val.) and Thai sharpunti (Puntius gonionotus Bleeker) in the ratio of 1:2:2:5 was conducted in 12 seasonal mini ponds (30 m1 each) for 105 days. There were six treatments each with two replicates and each pond was stocked with a total of 100 fish. Rice bran and mustard oil cake were used as supplemental feed either in combination or alone in presence or absence of fertilizer. Fertilizers were used in the form of organic, inorganic or both. The best growth performance of mirror carp, tilapia and Thai sharpunti was obtained in treatment Ill which received both fertilizer (organic + inorganic) and rice bran while the highest growth of silver carp was obtained In treatment VI receiving only inorganic fertilizer. However, the overall best production (2450 Kg/ha) and economic return for the culture period was obtained In treatment VI followed by treatment Ill. The results are discussed In the light of water quality parameters.

Keywords: Mixed culture, Seasonal ponds, Fertilizer, Feeding

Location: Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

Start Date: 00-08-1994

End Date: 00-11-1994

Program Area: Farming System

Commodity: Fish

Objectives:

To study the growth of some fast growing species in seasonal miniponds and to observe the effects of different fertilizers and supplemental feed on growth of fish in mixed culture.

Methodology:

Experimental system -The experiment was carried out for a period of 105 days during August to November'94 in 12 earthen mini-ponds of size 30 m2 each. The ponds were prepared by draining out water during summer. For convenience the ponds were numbered as 1 to 12. During the experiment the water depth was maintained at a maximum of 1 .2 m using fine meshed PVC over flow pipe on the bank fixed 1.2 m above the pond bottom. Ponds were divided into six duplicated treatments.Stocking and sampling of experimental fish - Fingerlings of mirror carp, red tilapia, silver carp and Thai sharpunti were collected from Freshwater Station, Fisheries Research Institute (FRI), Mymensingh. Each of the pond was stocked with a total of 100 fish comprising mirror carp, red tilapia, silver carp and Thai sharpunti at the ratio of 1:2:2:5 with a mean initial weight of 8.2, 12.0, 12.8 and 2.2g respectively. Fortnightly sampling of at least 20% of the fish was done using a small seine net to ascertain fish body weight and also to adjust feeding rate. At the end of the experiment harvesting was done by total draining out of the ponds. Water quality parameters - The water quality parameters such as temperature, pH, dissolved oxygen (DO), carbon dioxide, and alkalinity were monitored weekly. Water samples were collected from the ponds and measured for temperature (Hand held mercury thermometer) and pH (Corning pH meter), other parameters like dissolved oxygen, carbon dioxide, and alkalinity were measured by titrametric method. Plankton estimation- The plankton samples were collected using a 25 mic;ron mesh plankton net and studied using a Sedgewlck-Rafter cell and a binocular microscope (Olympus model BH-2). Planktons were grouped into phyotplankton and zooplankton. Planktons were expressed numerically per litre of water. Statistical analysis - One way analysis of variance (ANOVA) was used for statistical analysis of the growth data followed by Duncan's Multiple Range Test to determine the significance of variation among the treatment means. Standard error (± S.E) of treatment means were calculated from the residual mean square in the analysis of variance. Economic analysis - A simple economic analysis was carried out to estimate the net profit generated from this type of operation. The cost of different inputs was based on the Mymensingh whole sale retail market price for various inputs. However, the cost of leasing the ponds was not included. The average selling price of fish was considered at Tk. 50/-per Kg. An additional 7.5% on the top of total inputs has been included towards operating cost.

Source of Information: Bangladesh J. Fish. Res., 1 (2) : 09-18, 1997

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In a composite culture system growth of silver carp was markedly enhanced by the application of inorganic fertilizer. However, growth of other species (mirror carp, Thai sharpunti and red tilapia) were higher when receiving supplemental feed and fertilizer. The result of the present study suggests that above mentioned species can successfully be reared in seasonal ponds.

Knowledge Management: Journal