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Refinement of Creek`s Aquaculture Technology of Kaptai Lake

A. K. M. Saiful Islam
Senior Scientific Officer
Bangladesh Fisheries Research Institute

Abstract/ Executive Summary:

Aquaculture in the creek of Kaptai lake resulted in a higher individual bodyweight of Catla in T₃R₁ (393.5±31.62gm) compare to Rui in T₁R₂ (312.2±28.03gm) and Mrigal in T₃R₂ (284±15.42 gm) in 210 days experiment. The highest specific growth rate (SGR) of Catla, Rui and Mrigal were found in T₁R₂ (1.14), T₁R₂ (1.65) and T₃R₂ (1.39) respectively. The survival rate of Rui in T₂R₂ was higher than T₂R₂ and T₃R₂. The highest average air and water temperature (26.3±2.40 ^oC and 25.1±2.35 ^oC) were recorded in T₃R₁ and T₁C₁ whereas the lowest average air and water temperature (24.5±2.2 ^oC and 24.1±2.34 ^oC) were recorded in T₂R₁ and T₁R₂. The P^H of water was found to alkaline in nature (6.3±1.24 to 8.5±0.3) in nine creeks. The maximum average free CO₂ value (8±1.22 mg/l) was recorded in T₂R₂and the minimum (5±0.66 mg/l) in T₃R₂. The value of average total alkalinity was found to fluctuate from 51±7.44 mg/l in T₃C₃ to 63.4±6.35 mg/l in T₃R₂. Total hardness of lake water varied from 54±6.23 in T₃C₃ to 64.2±6.58) in T₃R₁ with regular trends in fluctuation. Mean secchi disc reading varied from 0.3±0.32 m in T₁C₁ to 0.5±0.36 m in T₂R₁. Dissolved oxygen was found to vary from 5.45±0.38 mg/l in T₂R₂ to 7±0.33 mg/l in T₃R_{1. The highest} net production was found in T₁R₂ creeks (5760 kg/ha). T₁R₁ and T₁R₂ creeks yielded 5555 kg/ha and 5760 kg/ha increased production, respectively with a higher economic return over T₁C₁ treatment (3381kg/ha).

Keywords: Kaptai lake, Creek, Aquaculture

Location: Kaptai lake, Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Fish

Objectives:

To refine culture technology for sustainable fish production in creeks
To identify problems regarding fish culture in creeks with their solution
To dimonstrate this technology

Methodology:

The experiment was carried out in three different Upazila of Rangamati Hill District. In each Upazilla three creeks (average 1.acre) were selected, among them one was treated as control. Creeks were selected by examining the creek site, soil type, water retention capacity, pollution-free and water depth (1m to 5m). Preparation of the creeks was done by repairing the mouth of the creeks (making a dam or construction of a pen or both). After two weeks, dirty materials were removed from the creeks bottom and lime (CaCO3) was applied at the rate of 250 kg ha-¹. Then all concerned creeks were fertilized with compost (a mixture of chopped and sun-dried green plants-88%, cow dung-10%, urea-1% and lime-1%) 1,250 kg ha^-1, urea 37.5 kg ha^-1 and TSP 25 kg ha^-1. Good quality fingerling was collected from Cowkhali government hatchery and stocked at the rate of 60, 65 and 70 fingerlings per decimal. The Fingerling size was 7-10 cm.

Source of Information: Annual Report 2017-19. 232 p.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) : 10,00,000

Achievement/Findings:

In general growth performance of Catla was comparatively higher than Rui and Mrigal. Among the three treatments, T₃R₁ was the best stocking density considering the highest growth of the Catla in the creeks and T₁R₂ was the best stocking density considering the highest growth of the Rui in the creeks.A group of entrepreneurs living within the immediate vicinity of the creek, who have property rights (beneficiaries), were assigned for the overall management of the project. At least ten to fifteen beneficiaries were considered for a group selection including a team leader. Entrepreneurs were responsible for guarding, cleaning shoreline of creeks, administering feed as per requirement, taking part in fish harvesting.

Knowledge Management: Report/Proceedings