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Investigation of Predatory Effect of African Magur (clarias Gariepinus) and Thai Pangus (pangasius Sutchi) on Thai Sarputi (barbodes Gonionotus)

S.M.R. Alam
Department of Fisheries, Bangladesh

M.F.A. Mollah
Department of Fisheries and Genetics, Bangladesh Agricultural University, Mymensingh-2202,

M.A.A. Faroque
Department of Fisheries, Bangladesh

A. Satter
Sheikh Fazilatunnesa Mujib Fisheries College, Melandah, Jamalpur

K.M.M. Hasan
Department of Fisheries, Bangladesh

Abstract/ Executive Summary:

The predatory effect of African magur (Clarias gariepinus) and Thai pangus (Pangasius sutchi) on Thai sarputi (Barbodes gonionotus) was investigated through two experiments conducted in nine aquaria ( 73 x 39 x 36 cm) for a period of 28 days each during August to September 2007 and July to September 2008, respectively, in the wet laboratory of the Department of Fisheries and Genetics, BAU, Mymensingh. Stocking ratio of predator and prey was 1: 2 in both experiments. Experiment 1 was carried out with the fingerlings 6.5 (± 0.4) cm of African magur and fry of Thai sarputi 2.5 (± 0.2) cm and experiment 2 was carried out with the fingerlings 6.61(± 0.13) cm of Thai pangus and fry of Thai sarputi 2.49(± 0.42) cm. Each experiment had three treatments with three replications. Fishes of treatment 1 (T₁) was fed with Tubificid worms, treatment 2 (T₂) with Sabinco feed and treatment 3 (T₃) was not fed. During the experiment, the water quality parameters measured periodically were almost similar. The predation rate of African magur was the highest in T3 and the lowest in T₁. The predation rate of Thai pangus was the highest in T₃ and nil in T₁. Thus fishes under starved condition show the highest predation and fishes provided with live feed Tubificid worm showed the lowest predation. Growth rate of African magur was the highest in T₂ and the lowest in T₃. Growth rate of Thai pangus was the highest in T₁ and the lowest in T₃. Growth rate of Thai sarputi was the highest in T₁ and the lowest in T₃ in both the experiments.

Keywords: Predatory effect, African magur (clarias gariepinus), Thai pangus (pangasius sutchi), Thai sarputi (barbodes gonionotus)

Location: Wet Laboratory of the Department of Fisheries Biology and Genetics, Faculty of Fisheries, Bangladesh Agricultural University

Start Date: 00-07-2007

End Date: 00-09-2008

Program Area: Farming System

Commodity: Carp fish, Cat fish, Pangus

Objectives:

1. To find out the predatory effect of two exotic catfishes and to determine the suitable combination and workable density of Thai pangus and African magur in polyculture system.

Methodology:

The experiments were conducted in the Wet Laboratory of the Department of Fisheries Biology and Genetics, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh during July 2007 to September 2008. Experiment 1 was continued for 28 days from 22 August to 20 September, 2007 to observe the predation of African magur on Thai sarputi and Experiment 2 was continued for a period of 28 days from 20 July to 18 August, 2008 to observe the predation of Thai pangus on Thai sarputi. Experiments were conducted in the laboratory in nine steel framed glass aquaria size 73x39x36 cm with water depth of 15 cm containing 42.7 litre of water that filled with sprinkler water supply through porous PVC pipe lines which ensured better oxygenation. For experiment 1 fry of Thai sarputi 2.5 (± 0.2) cm weighing 0.16 (± 0.01) gm were collected from a hatchery and fingerlings of African magur 6.5 (± 0.4) cm weighing 2.08 (± 0.03) gm were produced in the laboratory by artificial spawning. For experiment 2 fry of Thai sarputi 2.49 (± 0.42) cm weighing 0.151 (± 0.08) gm were collected from a hatchery and fingerlings of Thai pangus 6.61(± 0.13) cm weighing 2.06(± 0.12) gm were collected from fish-seed vendors. The number of predators and preys in each aquarium were 10 and 20 respectively. Each experiment had three treatments and each treatment had three replications. Fishes of treatment 1 (T₁) was fed with Tubificid worms, treatment 2 (T₂) with Sabinco feed once a day at 8 am and no feed was provided for treatment 3 (T₃). Water quality parameters (Temperature, dissolved oxygen and pH) were recorded throughout the experimental period at 11 am at 7 days interval. Sampling was made four times at 7 days interval. The growth gained by the fish was calculated by subtracting the previous length and weight from the corresponding length and weight at each sampling. Disappearance of preys was considered as the result of predation. Proximate composition of the dietary ingredients and diets were determined by the standard methods given by Association of Official Analytical Chemists. Data were analyzed as mean ± SD. Duncan’s Multiple Range Test was done in order to determine the significant growth variations of fish among the treatments.

Source of Information: J. Agrofor. Environ. 8 (1): 59-62, 2014; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The predation rate of African magur was the highest in T₃ and the lowest in T₁. The predation rate of Thai pangus was the highest in T₃ and nil in T₁. Thus fishes under starved condition show the highest predation and fishes provided with live feed Tubificid worm showed the lowest predation. Growth rate of African magur was the highest in T₂ and the lowest in T₃. Growth rate of Thai pangus was the highest in T₁ and the lowest in T₃. Growth rate of Thai sarputi was the highest in T₁ and the lowest in T₃ in both the experiments.

Knowledge Management: Journal