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Impact of In-pond Nursery of Shrimp (penaeus Monodon) Post Larvae on the Survival Rate and Production Under Modified Improved Culture System

M. L. Islam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna- 9280, Bangladesh

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

Abstract/ Executive Summary:

To observe the effectiveness of short time in-pond nursery of post larvae (PL) on the survival rate and production of shrimp (Penaeus monodon) under modified improved culture system, an experiment was conducted in earthen ponds at Brackishwater Station of Bangladesh Fisheries Research Institute, Khulna. Results of the experiment revealed that short time in-pond nursery of PL provided the significantly higher (p<0.05) survival rate (58%) than direct stocking of PL (47.81%) in the rearing pond. In-pond nursery of PL provided 9.95% better survival rate than direct stocking. The production of shrimp was 661 kg/ha under in-pond nursery of PL and it was 534 kg/ha under direct stocking of PL in rearing ponds. The production of shrimp was also significantly higher (p<0.05) under in-pond nursery system than direct stocking of PL in rearing ponds. Final weight gain and Food Conversion Ratio (FCR) values were similar in both the treatments. Water quality parameters in both stocking systems were insignificant and it was within the range of shrimp culture. In this study, the increment in production under in-pond nursery system was mainly due to the increase of survival rate in the respective treatment was ascertained.

Keywords: In-pond nursery, Modified improved culture, Survival, Production, Shrimp

Location: Khulna

Start Date: 00-04-2004

End Date: 00-07-2004

Program Area: Animal Health and Management

Commodity: Shrimp

Objectives:

To identify the impact of in-pond nursery of shrimp (Penaeus monodon) post larvae on the survival rate and production under modified improved culture system

Methodology:

The experiment was conducted in earthen ponds having an average area of 0.2 ha each in the pond complex under Brackishwater Station of Bangladesh Fisheries Research Institute situated at Khulna. The study was conducted for a period of 4 months from April- July, 2004. The experiment was designed with two treatments: 1) T₁- direct stocking of PL in rearing pond and 2) T₂- in-pond nursery of PL within nursery enclosure, with three replicates of each. The stocking density of shrimp for the culture pond was considered 5/m² for both the treatments. For short time in-pond nursery of shrimp post larvae, about 200 m² (10%) area of each pond receiving the respective treatments was enclosed with nylon net fastened with bamboo frame. Bamboo sticks (4/m²) and dried coconut leaves (1/m²) were installed within the nursery enclosure as shelter for the PL, also for the development of periphytonic films. Ponds were prepared through drying and liming the bottom soil with agricultural lime @250 kg/ha. The ponds were fed with tidal water up to a depth of 60-80 cm and the water was chlorinated with bleaching powder (20 ppm). Then the ponds were fertilized with urea @2.5 ppm, TSP @ 3.5 ppm, muriate of potash (MP) @ 0.6 ppm and molasses @ 30 kg/ha. After 7 days of fertilization, the PL (ABW, 0.007 g) of P. monodon were stocked as per mentioned design. Shrimps in all ponds were fed with commercial nursery feed (SABINCO) @100%, 60%, and 30% of the estimated shrimp biomass for the 1^st, 2^nd, and 3^rd week, respectively. After 18 days of rearing the juveniles within the nursery enclosure in the respective treatments were allowed to spread over the whole pond by up folding the nylon net of nursery enclosure. Afterwards, grow out commercial pellet feed of same company was supplied @ 3 – 5 % of the estimated shrimp biomass for the rest of the culture period. During the culture period, pond ecological parameters like temperature, transparency, water depth, pH, dissolved oxygen and salinity was monitored biweekly intervals. After 90 days of rearing, a jumping growth of few shrimps in all the ponds was observed. Final harvesting was done by dewatering the ponds after 110 days of culture. Then growth, survival and production were estimated. ANOVA was done to observe any differences in final weight, survival rate, yield and FCR values within the treatments.

Source of Information: Progress. Agric. 19(2) : 167-175, 2008 ISSN 1017-8139

Article Link (Online Journal): http://www.banglajol.info/index.php/PA/article/view/16958/11910

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In traditional shrimp culture system, farmers indiscriminately stock shrimp PL in the gher. Despite of no incidence of disease outbreak during culture period, the recovery rate of shrimp seemed very poor. Such low return rate often caused financial losses which demoralized them in future culture. But they did not know the ultimate cause of low survival rate. Among various causes inadequate conditioning of PL to pond water and improper nursery at initial stage might be the remarkable factor of sudden death of PL which leaded low survival rate and production of shrimp. The finding of the present trial focused that; in-pond nursery of PL might be one of the important culture tools for promoting the survival rate and production of shrimp under modified improved culture system. In case of gher condition it must be better to prepare an earthen nursery attached to the rearing gher to reduce the incidence of unwanted aquatic animals.

Knowledge Management: Journal