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Seasonal Abundance of Aquatic Weeds in Ponds and Beels

MD. RUHUL AMIN
Department of Aquaculture and Management, Bangladesh Agricultural University, Mymensingh

ABDULLAH AL MAMUN
Department of Agronomy, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

A total of 50 water bodies were surveyed of which 40% beels were infested heavily and 40% were infested moderately by different aquatic weeds. It was also found that 20% ponds were infested heavily and 55% ponds were infested moderately by different aquatic weeds. Among the aquatic weeds, Eictiornie cressipes, Pistia stretiotes, Limna minor, Enhydra fluctuans, Enhydra so., Leersia hexandra, Ipomea reptans, Panicum sp. and Scirpus debilis were found to be the dominant species. Most of the farmers thought Indian major carps consume aquatic weeds but others thought aquatic weeds reduced the production of fish.

Keywords: Aquatic weeds, Ponds, Indian major carps

Location: Department of Aquaculture and Management, Bangladesh Agricultural University, Mymensingh

Start Date: 00-05-1992

End Date: 00-06-1992

Program Area: Animal Health and Management

Commodity: Aquatic animal

Objectives:

The seasonal abundance and biology of aquatic weeds and thereby to generate information for the development of integrated weed management techniques for the betterment of the farmers are intended to be studied during the investigation.

Methodology:

A survey of aquatic weeds was conducted from May to June, 1992 in 15 villages under three Thanas viz. Mymensingh Sadar, Trishal and Muktagachha of Mymensingh district. Ten beels and 40 ponds were surveyed during the observation period. For this purpose 50 questionnaires were prepared and distributed among 50 fish farmers to be filled with their answers.

Source of Information: BAU Res. Prog. 7: 701-706; 1993

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

A total of 50 fish farmers were surveyed during the present investigation. Among them, 78% farmers regarded aquatic weeds as problem in fish culture. Most of the farmers (66%) considered that the Indian major carp occasionally consumed some aquatic weeds. Majority of the pond owners (66%) remove aquatic weeds once in a year and 30% owners do not clean their ponds. Thirty eight per cent farmers thought that aquatic weeds reduced fish production by 35-40% while 40% farmers considered that the production of fish was reduced by 20-30%. Almost all farmers reported that the Thana Fishery Officer never visited the village for giving advice. The survey reveals that aquatic weeds is a prevalent problem both in natural depression (Beel) and in pond. Farmers lack the appropriate know how about the control, management and use of aquatic weeds.

Knowledge Management: Report/Proceedings