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Impacts of Inclusion of Column Feeder Rohu (labeo Rohita) at Different Stocking Densities on Growth, Production and Environment in Freshwater Prawn-carp-mola Polyculture System

M.E. Ahsan
Dept. of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali, Bangladesh

A. Nahar
Dept. of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali, Bangladesh

M.R. Sharker
Dept. of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali, Bangladesh

M.A. Alam
Dept. of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali, Bangladesh

M.A.B. Siddik
Dept. of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali, Bangladesh

Wahab, M.A.
Dept. of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

The research investigated the impacts of inclusion of column feeder rohu (Labeo rohita) on growth and production in freshwater prawn-carp-mola polyculture system for a period of 172 days. Four stocking densities of Rohu were maintained as 500, 1,000, 1,500 and 2,000 ha^-1 in treatment R₅₀₀, R₁₀₀₀, R₁₅₀₀ and R₂₀₀₀, respectively in triplicates. All ponds each 120 m² were stocked with juvenile freshwater prawn (Macrobrachium rosenbergii), silver carp (Hypophthalmichthys molitrix), catla (Catla catla) and small fish mola (Amblypharyngodon mola) at the fixed stocking densities of 20,000, 1,500, 1,000 and 20,000 ha^-1, respectively. Prawns were fed with pelleted feed twice daily started with 10% and gradually reduced to 3% of body weight and continued throughout the study period. All fish were fed with mixture of soaked rice bran and mustard oil cake (2:1) at the rate of 3% of the body weight daily. All the water quality parameters and chlorophyll-a were measured. The density of rohu significantly (P<0.05) influenced the survival rate, growth and production of freshwater prawn. Catla and Mola production were affected adversely with increasing rohu density. The production of rohu increased with increasing density although the individual weight decreased. The combined production of all finfish was significantly lower in R₀ whereas, the combined production of all species including prawn did not differ significantly (P<0.05) among the treatments. The treatments R₀ and R₅₀₀ fetched higher net profit without significant difference between them. Therefore, inclusion of rohu at a density of 500 ha^-1 may be recommended for prawn-carp-mola polyculture.

Keywords: Rohu (Labeo rohita), Growth, Production, Prawn-carp-mola polyculture

Location: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh.

Start Date: 15-06-2009

End Date: 03-12-2009

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

1. To investigate the impacts of inclusion of column feeder rohu, Labeo rohita, an important major carp on growth and production and pond ecosystem in prawn-carp-mola polyculture system.

Methodology:

The experiment was carried out for a period of six months from 15 June and 3 December, 2009 at the Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh. Fifteen earthen ponds with an area of 120 m² each and an average depth of 1 m were used for this study. Four treatments named as R₅₀₀, R₁₀₀₀, R₁₅₀₀ and R₂₀₀₀ with inclusion of rohu at different stocking densities (500, 1,000, 1,500 and 2,000 ha^-1, respectively) were compared with a control devoid of rohu (R₀) each with three replications. All ponds were stocked with juvenile freshwater prawn (Macrobrachium rosenbergii), silver carp (Hypophthalmichthys molitrix), catla (Catla catla) and small fish mola (Amblypharyngodon mola) at the fixed stocking densities of 20,000, 1,500, 1,000 and 20,000 ha^-1, respectively as well. 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. Fresh water prawns were fed with pellets (28% crude protein) daily at a rate of 10% for first month, 8% for the second month, 6% for the third month and 3% for rest of the culture period. Half of the daily feed was applied in the morning and rest half in the evening. Rohu were fed with mixture of rice bran and mustard oilcake (2:1) at the rate of 3% of the body weight daily. 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). Total alkalinity, NH₃-N, NO₂-N, NO₃-N, PO₄-P, and chlorophyll-a were monitored fortnightly by using HACH kit (DR 2010). Fish 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). 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.

Source of Information: International Journal of Biological Research, 1 (2) (2013) 48-54

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Inclusion of rohu did not affect the growth and production of silver carp and mola, but catla production was adversely affected. Prawn survival, growth and production were decreased with increasing density of rohu. The overall production of prawn was higher in treatment R₀, but combined production of prawn and finfish was better in treatment R₅₀₀. Net profit derived from the experiment was high and equal in treatment R₀ and R₅₀₀. Therefore, inclusion of rohu at a density of 500 ha^-1 may be recommended for higher production and economic return in prawn-carp-mola polyculture system.

Knowledge Management: Journal