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Effect of Mola (amblypharyngodon Mola Ham.) on the Growth and Production of Carps in Polyculture

A.H.M. Kohinoor
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

S.H. Thilsted
Research Department of Human Nutrition, The Royal Veterinary and Agricultural University, Copenhagen, Denmark

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

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

Abstract/ Executive Summary:

The effect of introduction of mola ( Amblypharyngodon mala) in polyculture with rohu (Labeo rohita), catla (Catla catla) and mirror carp (Cyprinus carpio var. specularis) was studied in semi-intensive culture system in the pond complex of the Fisheries Faculty, Bangladesh Agricultural University, Mymensingh. Mala, a small indigenous fish was found to exert a negative impact on growth and production of carps. After four months' rearing, significant difference was observed.

Keywords: A. mala, Poluculture, Indian major carp, Common carp

Location: Fisheries Faculty, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-1996

End Date: 00-01-1997

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To assess the effects of mola (A. mola) in the carp polyculture system.

Methodology:

Study area - The experiment was conducted in six earthen ponds of 75m² each with a depth of 1.5m in the pond complex of Faculty of Fisheries at the Bangladesh Agricultural University, Mymensingh , during August '96 to January '97. Preparation of ponds - All the ponds were treated with lime at the rate of 250 kg/ha. After three days of liming,the ponds were fertilized with cow manure at the rate of 1000kg/ha. Stocking of fish - The ponds were stocked after three days of fertilization. The experiment consisted of two treatments with three replicates. In both the treatments, rohu (L. rohita), catla (C. catla) and mirror carp (C. carpio var. specularis) were stocked at a stocking density of 1 0,000/ha in the ratio of 1 :1 :1. A small indigenous species, mola (A.mo/a) was stocked as an additional component in treatment II at a stocking density of 25,000/ha. Post stocking management - Both the treatments were subjected to the same regime of feed and fertilizer application. Commonly available agricultural by-products such as rice bran ·(60%) and mustard oil cake (40%) were used as supplementary feed at the rate of 3-4 % of standing crop of fish. Fish were sampled at fortnightly intervals to assess their growth and health. Feeding was adjusted on the basis of estimated fish biomass. All the ponds were also regularly fertilized with cattle manure at the rate of 1000 kg/ha at 15 days interval. Water sampling and analysis - Water quality parameters transparency, pH, dissolved oxygen (DO) and chlorophyll-a were estimated at weekly intervals between 0800 to 0900 hrs, while total hardness, P0₄-P and NH₃-N analysed at fortnightly intervals. Standard procedures and methods were followed for analyses of water samples. Plankton enumeration - Plankton samples were collected at fortnightly intervals. Using a Sedgwick-Rafter cell, identification and enumeration of plankton were done. Harvesting of fish - At the end of the experiment, the fishes were recovered by repeated netting and de-watering the ponds. About 40% fish were measured to determine the final growth and all the fishes were weighed for the estimation of total production. Statistical analysis - For statistical analysis of the data, ANOVA was applied.

Source of Information: Bangladesh J. Fish. Res., 2 (2): 119-126, 1998

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It is clear from the present experiment that with stocking of mola, the growth of rohu and mirror carp is affected severely. It is suggested that mola may not be cultured with carps.

Knowledge Management: Journal