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Effect of Submerged Aquatic Vegetation on Growth and Survival of Penaeus Monodon (fab.)

M.S. Ali
Bangladesh Fisheries Research Institute, Brackishwater Station, Khulna 9280, Bangladeesh

S.U. Ahmed
Bangladesh Fisheries Research Institute, Brackishwater Station, Khulna 9280, Bangladeesh

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

Abstract/ Executive Summary:

An experiment was conducted in brackishwater ponds with transplanted aquatic weed (Najas sp.) to study the effect of submerged aquatic vegetation on culture of Penaeus monodon. Out of six ponds three were without any aquatic vegetation (T₁) while in other three ponds weeds were planted covering 40% of the pond bottom (T₂). Hatchery produced post larva of P. monodon (0.006 g) were stocked in all ponds at a density of 40,000/ha. Shrimps were fed twice daily with commercial and formulated feed prepared from locally available ingredients. After 105 days of rearing shrimp of highest average weight (63.18g) was obtained from T₂ with a survival rate of 25.90% and the total production was obtained at 654.54kg/ha. The average weight, survival and total production of shrimp in T₁ were 35.0 g, 28.76% and 405.63 kg/ha, respectively.

Keywords: P. monodon, Aquatic weed, Survival

Location: Brackishwater Station, Bangladesh Fisheries Research Institute,Khulna

Start Date: 00-00-1996

End Date: 00-00-1996

Program Area: Animal Health and Management

Non-commodity: Impact

Objectives:

To observe the effect of growth of the submerged aquatic rooted vegetation Najas sp. on survival and growth of Penaeus monodon.

Methodology:

Six ponds, each of 0.25 ha area were selected for two treatments with three replications in the Brackishwater Station, Bangladesh Fisheries Research Institute, Khulna. After completion of pond preparation, the ponds were first flashed with 20- 30cm tidal water to reduced the soil acidity. Then agricultural lime was applied at a rate of 100 kg/ha followed by the application of cow dung (500 kg/ha) and mustard oil cake (100 kg/ha). Inorganic fertilizers like Triple Super phosphate (TSP) and Urea were also applied at a rate of 35 kg/ha in 3:1 proportion. Tidal water was then added to obtain required water level at the ponds (40-60cm) and waited for natural feed development. Out of six ponds, three were without any aquatic vegetation (T₁) and other three were with wild aquatic weed- Najas sp. covering about 40% of the pond bottom area (T₂). After 7 days of fertilization the ponds were stocked with hatchery bred post larvae of Penaeus monodon (0 .006 g each) with a density of 40,000 /ha. After stocking, shrimps were fed with commercially supplemented Starter-1 feed (Saudi-Bangla shrimp feed) for 30 days, twice a day at 7: 00 and 18: 00 hours at a rate of 100% body weight during first week of stocking, then reduced to 60% and 40% for the 2nd and 3rd week, respectively. In addition, boiled trash fish flesh was supplemented at the rate of 20% of body weight for 2nd week and then 10% for the next 15 days. During rest of the period, feeding was done by formulated feed prepared from local ingredients (30-32% protein content) in the second month at 5% of body weight and 3% in the rest of the days, till harvest. Water exchange of the ponds (preferably 30%) was done fortnightly during new and full moons. To maintain water productivity, ponds were treated with Urea and TSP (3 : 1) at a rate of 30 kg/ha after every exchange of water. Water quality parameters such as dissolved oxygen, pH, salinity, temperature and transparency were monitored fortnightly. Growth performance of shrimp were recorded by weekly sampling. After 105 days of rearing shrimps were harvested in mid July.

Source of Information: Bangladesh J. Fish. Res., 3(2):145-149, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

After 105 days of rearing shrimp of highest average weight (63.18g) was obtained from T₂ with a survival rate of 25.90% and the total production was obtained at 654.54kg/ha. The average weight, survival and total production of shrimp in T₁ were 35.0 g, 28.76% and 405.63 kg/ha, respectively.

Knowledge Management: Journal