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Comparison of Growth and Production Performance Between Male and Female Giant Freshwater Prawn in Combination with Mola

K. Fatema
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

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

R. Pervin
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

M. S. R. Khan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

H. C. Roy
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

An experiment was conducted to compare growth and production performance between all-male and all-female giant freshwater prawn (Macrobrachium rosenbergii) in combination with mola (Amblypharyngodon mola) at the Fisheries Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh. The research was carried out for a period of 120 days in nine earthen ponds with an average depth of 1.2 m. The experiment had three treatments, viz. polyculture of all-male prawn with mola (stocking density 20,000 ha^-1), monoculture of all-male prawn and monoculture of all-female prawn were treated as T₁, T₂, and T₃, respectively with three replications of each and prawn stocking density was 30,000 ha^-1 in all the treatments. Formulated sinking feeds were applied twice daily for prawn, and assuming 80% survival feeding rates were gradually reduced to 10-5% of body weight from the beginning to the last month. All water quality parameters (except transparency, chlorophyll-a and plankton) did not vary statistically significantly (P>0.05) among the treatments. Survival of prawn in respective of gender was lower in monoculture than in polyculture with mola, but did not vary significantly (P>0.05). Considering growth and production performance in all treatments, the male prawn showed better growth and production performance than female prawn and the highest gross and net production was recorded in treatment T₁, therefore, polyculture of all-male prawn with mola is better than monoculture.

Keywords: All-male prawn, All-female prawn, Mola, Nutrient-dense, Polyculture

Location: Fisheries Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 00-08-2010

End Date: 00-12-2010

Program Area: Variety and Species

Commodity: Prawn

Objectives:

1. To compare growth and production performance between all-male and all-female giant freshwater prawn (Macrobrachium rosenbergii) in combination with mola (Amblypharyngodon mola).

Methodology:

Pond preparation - All undesirable fishes were completely eradicated by applying rotenone at the rate of 7.5 kg ha^-1. Lime (CaCO3) was applied at the rate of 250 kg ha^-1 after one week of rotenone application. Urea, TSP (triple super phosphate) and cow dung were applied at the rates of 25 kg ha^-1, 25 kg ha^-1 and 750 kg ha^-1 respectively to promote plankton and algal growth. Three palm leaves were placed on the pond bottom to create shelter for prawn. The surroundings of all ponds were fenced by 1 m height nylon net to prevent the entry of predators or escaping of young prawn.

Stocking - The prawn juveniles were purchased from a nearby commercial hatchery then brought to the experimental site equipped with aerators. Mola seeds were collected from local vendor. The segregation of male juvenile of M. rosenbergii was done manually on the basis of following criteria: (1) male genital organ situated at the base of fifth or last pair of walking legs whereas female genital opening situated at the base of third pair of walking legs (periopods), (2) second pair of pleopod of male contains appendix masculina which is absent in female, (3) the walking legs of males are set in nearly parallel lines, with little open space between them but in case of female wider gap exist in fifth pair of walking legs, (4) ventral side of the first abdominal somite in male has a central lump or point which can be felt with the finger whereas in case of female no such lump or point exist. The juveniles of freshwater prawn (1.75 g) and mola (0.80 g) fry were stocked according to the experimental design.

Experimental design - The experiment was conducted in a completely randomized design into three different treatments with three replications each viz. treatment-1 (T₁) was carried out with polyculture of all-male prawn with mola, treatment-2 (T2) was carried out with monoculture of all-male prawn and treatment-3 (T₃) was carried out with monoculture of all-female prawn.

Harvesting - At the end of the experiment adult freshwater prawn and mola were harvested by netting repeatedly with a fine meshed seine net from each pond. All prawn harvested from each pond were counted, measured and weighed to evaluate the growth and production performance of manually segregated all-male giant freshwater prawn with all-female in pond culture systems. On the other hand, all harvested mola were also counted, measured and weighed.

Statistical analysis - For the statistical analysis of collected data, one-way analysis of variance (ANOVA) and Tukey’s Test was performed using the SPSS (Statistical Package for Social Science, version-11.5). Significance was assigned at the 0.05% level.

Source of Information: J. Environ. Sci. & Natural Resources, 4(2): 137-142, 2011; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Survival of prawn in respective of gender was lower in monoculture than in polyculture with mola, but did not vary significantly (P>0.05). Considering growth and production performance in all treatments, the male prawn showed better growth and production performance than female prawn and the highest gross and net production was recorded in treatment T₁, therefore, polyculture of all-male prawn with mola is better than monoculture.

Knowledge Management: Journal