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Species Diversification in Coastal Aquaculture: Production Potentials of Shrimp (penaeus Monodon) with Mono and Mixed Sex Tilapia

A.F.M Shofiquzzoha
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh.

M.J. Alam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh.

M. Moniruzzaman
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna 9280, Bangladesh.

Abstract/ Executive Summary:

An experiment of 120 days of culture was conducted in brackishwater earthen ponds having an area of 0.2ha each. The hatchery produced shrimp (Penaeus monodon) post larvae were stocked in the 40m² fine meshed nylon net nursery enclosures were fed with commercial pellet feed. After two weeks of nursing, juveniles were allowed to spread in cultural pond by opening the fence. Fingerlings of three different strain of tilapia were stocked as shrimp and Strain-I all male (monosex) (T₁), shrimp and Strain-2 all male (T₂), shrimp and Strain-3 mixed sex population (T₃) @ 20,000/ha and 10,000/ha, respectively and shrimp only (monoculture) (T₄) @ 20,000/ha. The shrimp and fish were [cd with [arm made reed consisting of a mixture of fishmeal 29%, MOC 15%, rice bran 30%, soybean meal 16%, wheat [tour 9% and vitamin premix 0.1 %. The average final weigh t of shrimp was 24.9± 1.13g, 23.41 ± 3.26g and 26.67± 1.89g that stocked with tilapia in treatments T₁ T₂ and T₃respectively. The final average weight of shrimp in monoculture (T₄) was 27.41 ±0.76g, apparently higher but insignificant in treatments. The survival of shrimp was 42.17%, 32.38%, 39.45% and 61.98% in treatments T_1, T₂, T₃, and T4 respectively. The production of shrimp in concurrent culture was 193.67, 154.26 and 210.4lkg/ha in T₁, T₂, and T₃, respectively, while in monoculture (T₄) was 339.77 kg/ha. The growth and survival of tilapia among the treatments was insignificant. The growth of monosex tilapia ranged 225.29 and 291.31g and survival 62.77 and 72.20% in T₁, and T₂ respectively, in mixed sex was 193.0g and 83.20% (T₃). The production of tilapia monosex strains was I 676.69kg/ha (Strain-2 all male) and 1668.98 kg/ha (Strain-I ,all male) while that of Strain-3 mixed sex population was 1622.92 kg/ha.

Keywords: Species diversification, Penaeus monodon, Monosex tilapia

Location: Brackishwater Station of the Bangladesh Fisheries Research Institute, Paikgacha, Khulna.

Start Date: 01-03-2007

End Date: 30-06-2007

Program Area: Farming System

Commodity: Shrimp, Tilapia

Objectives:

To compare the growth and production of mixed and mono sex tilapia strains viz., BanglaFISHGEN all male (Strain-I), GenoMar all male (Strain-2) and BFRI-GIFT mixed sex population (Strain-S), in concurrent culture with shrimp.

Methodology:

The experiment was conducted during March to June 2007 at the Brackishwater Station of the Bangladesh Fisheries Research Institute, Paikgacha, Khulna. Eight ponds of 2,000 m² each in the pond complex were selected and made ready. A 40m² nursery area encircled with nylon net fastened with bamboo fence was setup in each pond for nursing shrimp post larvae. The ponds were prepared by sun drying followed by liming with CaO @ 400 kg/ha and by fertilizing with mustard oil cake (MaC) @ 250 kg/ha and TSP and urea (2:1) @ 35 kg/ha, respectively. After 7 days, the ponds were filled up to a depth of 80cm with tidal brackishwater from nearby the Sibsha river was entered into the ponds through a feeder canal and awaited for a week period for suitable water conditions. Hatchery produced PCR tested shrimp (P. monodon) post larvae (PL) were stocked in the nursery enclosure and fed with commercial shrimp starter feed. After two weeks of nursing, at the 15^th day, juveniles were allowed to spread in cultural pond by opening the fence. Fingerlings of different strains of tilapia were stocked at the 5th week of shrimp stocking. Under four different treatments, each two ponds were stocked with shrimp and Strain-I (BanglaFISHGEN) all male (T₁), shrimp and Strain-2 (GenoMar) all male (T₂), shrimp and Strain-3 (BFRI GIFT) mixed sex population (T₃) @ 20,000/ha and I0,000/ha, respectively while two ponds with shrimp only (T₄) @ 20,000/ha. The initial weight of shrimp was 0.005±0.00Ig and for Strain-I, Strain-2 and Strain-3 were l.34± 1.13g, 0.21 ±0.05g and 0.74±0.I3g, respectively. The shrimp were fed commercial pellet feed (Soudi-Bangla) and fish were fed with common prepared feed (approx. protein content, 30%) consisting of a mixture of fishmeal 29%, MaC 15%, rice bran 30%, soybean meal 16%, wheat flour 9°~ and vitamin premix 0.1 %. Feed together was supplied twice daily @ 5-3% of shrimp and fish standing crop/day, twice at dawn and dusk.The physicochemical parameter viz., air and water temperature, salinity, pH and transparency (Secchi-disk reading) of the ponds were monitored weekly during the experimental period and growth of shrimp and fish were monitored fortnightly. After 120 days of culture, both shrimp and fishes were harvested by de-watering the ponds and the growth, survival and production were estimated.

Source of Information: Bangladesh Journal Fish. Res., 13(2),2009: 179-184

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

A simple benefit-cost (B:C) analysis was done for all treatments. The B:C ratio was 1:1.52, 1:l.58, 1:1.60 and 1:1.59 in treatments T₁, T₂, T₃,and T₄. respectively. The growth and production performance and BCR indicates that both of mono or mixed sex of tilapia strains in concurrent cuIture with P. monodon wilI be profitable as mono culture of shrimp.

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