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Effects of Supplemental Feed and Fertilizer on Growth and Survival of Macrobrachium Rosenbergii (de Man) Post Larvae in Pond Nursery System

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

M. L. Ali
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh.

M. A. Salam
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

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

Abstract/ Executive Summary:

The study was conducted to compare the performance of different nursing practices of giant freshwater prawn (Macrobrachium rosenhagii) post-larvae (PL). Three treatments such as only fertilizers (T₁), fertilizers with 5%) supplementary feed (local feed) (T₂), and 10% commercial feed (T₃) were applied in the nursing system of prawn PLs in earthen pond. An earthen pond (315 m²) was divided into nine equal small ponds by fine meshed nylon nets. Feeds were used once daily on a tray placed near the pond bottom. There was a significant difference (p<0.05) in some water quality parameters like pH and total alkalinity, but all measured water quality parameters viz. water temperature, transparency, dissolved oxygen and ammonia-nitrogen were within the acceptable range for nursing of prawn PL. The results showed that the mean final lengths of prawn post-larvae were 6.3±0.07cm, 7.12±0.22cm and 8.17±0.16cm in T₁, T₂ and T₃, respectively. There were significant difference (p<0.05) in mean final length of prawn PL among the treatments. Significantly higher (p<0.05) average daily weight gain was observed in T₃ (0.071±0.007 g) than in T₂ (0.052±0.006 g) and T₁ (0.031±0.0002 g). The specific growth rate (SGR) of T₃ (8.81±0.26) was found significantly higher (p<0.05) than T₂ (8.35±0.22) and T₁ (7.42±0.11). Survival rate (%) was also significantly higher (p<0.05) in T₃ (66.24±1.58) than in T₂ (60.52±1.64) and T₁(53.86±2.71). Therefore, it may be concluded that the growth and survival in prawn nursery was better in commercial feed than only fertilizers and fertilizers with local feeds.

Keywords: M. rosenbergii, Post-larvae, Nursing, Commercial feed

Location: Bangladesh Fisheries Research Institute, Mymensingh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Prawn

Objectives:

To compare the performance of different nursing practices of giant freshwater prawn (Macrobrachium rosenhagii) post-larvae (PL).

Methodology:

The study was carried out in a rectangular earthen pond of 315 m²at Freshwater Station of the Bangladesh Fisheries Research Institute, Mymensingh for 60 days from July to September. The large pond was divided into nine equal small pond of 35m² each by fine meshed nylon net. There were three replications for each of the three treatments viz. only fertilizers (T₁), fertilizers with 5% supplementary feed (local feed) (T₂) and 10% commercial feed (T₃). Local feed was prepared by using the local ingredients such as rice bran 70% and mustard oil cake 30%. Saudi-Bang!a shrimp reed was selected as commercial reed for this experiment. The PL of M. rosenbergii were collected Cram the hatchery of BFRI. The ponds were stocked with prawn PL having average weight 0.022±0.00g, 0.021±000g and 0.022±0.002g in treatment T₁, T₂ and T₃, respectively and average length 0.89±0.01cm, 0.88±0.01cm and 0.11 ±0.07 cm in treatment T₁, T₂ and T₃, respectively. The stocking density of prawn PL was 20/m² Cowdung, urea and triple surer phosphate (TSP) were applied weekly throughout the experimental period at a rate of 3kg 40m², 75 g40m² and 50 g/40 m², respectively. Throughout the experimental period, the water quality parameters were recorded weekly. Temperature (?), transparency (cm) and dissolved oxygen (mg/l) were measured between 7.00 and 8.00 am daily at the pond site. Alkalinity (mil), pH and ammonia-nitrogen (rng/l) were measured weekly at Water Quality and Pond Dynamics Laboratory of the Faculty of Fisheries, Bangladesh Agricultural University, Mymenslngh. Temperature and dissolved O₂ were measured by a digital DO meter. Transparency was measured by using a secchi disc and pH with a pH electrode. Total alkalinity was determined titrimitrically. Ammonia-nitrogen (NH₃-N) was determined by HACH Kit. The chemical reagents used for this purpose were Nesslar reagent, mineral stabilizer and tri-methyl alcohol. A good number of prawns PL (10-20 individuals) were sampled from each pond at every ten days interval and their length and weight or each individual was measured separately to assess the growth rate of prawns PL. At the end of the experiment, water was pumped out or the ponds and all prawn juveniles were collected, counted and weighed individually for each pond to assess the survival rate. Experimental data was collected and analyzed. For the statistical analysis of the data, a one-way ANOVA and DMRT were done by using the SPSS (Statistical Package for Social Science) version-10.0. Significance was assigned at the 0.05° level. Duncan's test was used to tests the results of multiple ranges for comparisons or averages.

Source of Information: Bangladesh Journal of Fisheries Research, June-Dec. 2010, Vol.14(1-2), pp:37-44, ISSN:1026-6690.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

There was a significant difference (p<0.05) in some water quality parameters like pH and total alkalinity, but all measured water quality parameters viz. water temperature, transparency, dissolved oxygen and ammonia-nitrogen were within the acceptable range for nursing of prawn PL. The results showed that the mean final lengths of prawn post-larvae were 6.3±0.07cm, 7.12±0.22cm and 8.17±0.16cm in T₁, T₂ and T₃, respectively. There were significant difference (p<0.05) in mean final length of prawn PL among the treatments. Significantly higher (p<0.05) average daily weight gain was observed in T₃ (0.071±0.007 g) than in T₂ (0.052±0.006 g) and T₁ (0.031±0.0002 g). The specific growth rate (SGR) of T₃ (8.81±0.26) was found significantly higher (p<0.05) than T₂ (8.35±0.22) and T₁ (7.42±0.11). Survival rate (%) was also significantly higher (p<0.05) in T₃ (66.24±1.58) than in T₂ (60.52±1.64) and T₁(53.86±2.71). Therefore, it may be concluded that the growth and survival in prawn nursery was better in commercial feed than only fertilizers and fertilizers with local feeds.

Knowledge Management: Journal