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Effect of Chlorination on the Production of Shrimp (penaeus Monodon) in Brackishwater Ponds

Azhar Ali, MS Khatun
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna, Bangladesh

S Bikash Saha
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna, Bangladesh

MNS Mamun Siddiky
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna, Bangladesh

D Kumer Mondal
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna, Bangladesh

S Lutfor Rahman
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to standardize dose of chlorine for improving sanitation of shrimp (Penaeus monodon) culture in brackishwater ponds in modified extensive system over a period of 120 days from 27 March 2013 to 25 July 2013. The experiment designed with four treatments whereas one treatment is a control of without any chlorine dose and other three treatments designed with three chlorine doses such as T₁ (No chlorination), T₂ (3 ppm), T₃ (6 ppm) and T₄ (9 ppm) each with three replicates. Total bacterial load reduced after application of chlorine. After chlorination at 3-9 ppm, about 82-85% total bacterial load was reduced. Increase in concentration of chlorine concentration showed no significant reduction of bacterial load. But after two days, bacterial load again started to increase. Load of total coliform also reduced drastically after application of chlorine at the same rate. The mean final weight of shrimp was 18.89±1.20, 17.90±0.50, 19.25±0.53 and 19.00±0.66 g in T₁, T₂, T₃ and T₄, respectively. The highest mean survival was recorded in T₁ (77.16±4.41%) followed by T₂ (77.09±4.26%), T₃ (63.61±3.35%) and T₄ (64.24±3.25%). The highest production was recorded in T₁ (730.73±87.55 kg ha^-1) which was significantly differed from (p < 0.05) T₂, T₃ and T₄. Higher concentration of chlorine also showed no negative impact on the growth of shrimp but mortality of some moulted shrimp was observed. The present study, it was revealed that increasing the chlorine doses, decreasing the production and without chlorination highest production was recorded.

Keywords: Chlorination, Production, Penaeus monodon, Brackishwater ponds, Shrimp

Location: Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha

Start Date: 00-03-2013

End Date: 00-07-2013

Program Area: Animal Health and Management

Commodity: Shrimp

Objectives:

The present study undertaken different dose of chlorination on micro flora, water quality, survival and growth of shrimp, Penaeus monodon.

Methodology:

The experiment was conducted in 12 ponds of 1000 m² each of Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha. The ponds were prepared by treating soil with lime (Quick lime: dolomite 3:1) @ 250 kg ha^-1 and then filled with tidal water up to a depth of 1.0 m. After that, all animalcules were killed by using 55ppm bleaching powder. The buffering capacity of the pond water was strengthened by applying dolomite @ 10-15 ppm. The pond water was fertilized with urea and TSP @ 2.5 ppm, 3.0 ppm respectively. Fermented molasses were applied to the pond water @ 15ppm to develop colour of water to check penetration of sunlight. If any pond was not grown sufficient primary production then again use of 5 ppm fermented molasses. After production of sufficient plankton, required quantity of PCR (polymerized chain reaction) tested PL20 was stocked to the respective pond. The stocked shrimps were fed with commercial feed. The used different grades (crumble to pellet) of feed contains 39-45% protein, 3% lipid, 6% fiber, 18% ash and 11% moisture. Protein concentration was higher in feeds used for smaller shrimps. Feed was applied by spreading and adjusted fortnightly after sampling with cast net. The load of total heterotrophic bacteria and total coliform of water was checked as indicator of sanitation. The estimation of bacterial load was done before and after two hours and two following successive days after application of chlorine. Total heterotrophic bacteria were counted by pour plate technique method and total coliform by most probable count (MPN) method as mentioned in APHA . Primary productivity of the ponds was monitored before and after two hours and two following successive days after application of chlorine following classical dark and light bottle method as mentioned by Adoni Basic water quality variables (viz., depth, temperature, salinity, pH, transparency, free carbon dioxide, dissolved oxygen and alkalinity) were determined at fortnight intervals following standard methods ^[11]. To maintain undisturbed ecology of the ponds, no water was exchanged. Only the evaporated water was replenished with the water of the adjacent canal. Health of the stocked shrimps was checked almost daily through check tray. After 120 days of rearing, all shrimp were harvested by de- watering the ponds and growth, survival and production were estimated. Data were analyzed using MS Excel. One way analysis of variance (ANOVA) was used to determine the final weight, survival and production. The Duncan’s test was used to determine the differences among the treatments. Differences were considered statistically significant at 5% level.

Source of Information: International Journal of Fisheries and Aquatic Research; Volume 3; Issue 1; January 2018; Page No. 31-34, ISSN: 2456-7248;

Article Link (Online Journal): www.fishjournals.com

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the present study it is stated that the higher dose of chlorine in brackishwater shrimp culture pond decrease the production of shrimp due to higher mortality of moulted shrimp. But the lower dose of chlorination is reduced the pathogenic load without any hamper of survival and production of shrimp in brackishwater culture. So, further studies for a longer period with more treatments and replications should be done for more helpful results.

Knowledge Management: Journal