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Effect of Practicing Optimum Stocking Model on Fishermen's Access Into the Large Water Bodies

ALAM, M.H.
Aqua Culture Development Project, International Fund for Agriculture Development (IFAD), Jessore, Bangladesh

SAROWER, M.G.
Fisheries and Marine Resource Technology, University of Khulna, Khulna, Bangladesh

RAHMAN, M.A.
Civic Engagement Division, Transparency International Bangladesh (TIB), Satkhira, Bangladesh

Abstract/ Executive Summary:

The main purpose of the study is to quantifying the relationship between fishermen’s stocking and cost decisions towards the output measure or yield-kg into the Large Water Bodies (LWBs). The duration of the study covered a period of over 48 months (4 years), financial years 2000-01 to 2003-04. One privately managed large water body (PMLWB) namely Morshina, Keshobpur Upazilla; one Government managed large water body (GMLWB) namely Kathgora, Chowgacha upazilla and the last but the least, community managed large water body (CMLWB) namely Purakali, Avoynagar Upazilla were taken for this study through randomly basis. The LWBs were taken from the mentioned different upazillas of the same district namely Jessore. The CMLWB was taken as experimental and the rests were taken as control water bodies. Optimum Stocking Model (OSM) was only practiced in CMLWB but into the rests stocking practices were commonly conducted. Different physical and limnological parameters were taken to analyze optimum stocking condition of the large water body. These included secchi disc depth (cm), standard water area (ha), stocking density (fingerlings/ha), yields of cultured species (kg/ha). In a culture based fisheries exploitation of a semi-closed water body, one of the few management tools available is the stocking strategy; i.e., choice of fish species stocked, fingerling stocking weight, stocking density (total and by species), the time of stocking and the last but not the least targeted sales volume. Among all LWBs in CMLWB highest result of carp yield was found in the year 2003-04 among the all LWBs, 1354.89 kg/ha at a stocking density 3148 fings/ha, standard water area 55.08 ha and secchi depth 49.90 cm. Comparing year wise yields it was found that the linear relationship of stocking density and yields existed up to the limit of stocking density 3148 fings/ha in CMLWB. After that yields were decreased in terms of increased stocking density. Following Cost Volume Profit (CVP) analysis fishermen’s targeted sales volumes were prepared and significant difference (P<0.03) were found between year wise targeted and actual sales volumes (kg).

Keywords: Optimum Stocking Model (OSM), Cost Volume Profit (CVP) analysis, Catch composition

Location: Khulna district

Start Date: 00-00-2000

End Date: 00-00-2004

Program Area: Knowledge Management

Commodity: Fish

Objectives:

To quantifying the relationship between fishermen’s stocking and cost decisions towards the output measure or yield-kg into the Large Water Bodies

Methodology:

Primary productivity of each LWB was measured by secchi disc depth (cm) twice in a month every year. Through observations standard water areas (ha) were collected three times in a year with respect to lean season, rainy season and winter season. Information regarding stocking densities (fingerlings/ha) of three Indian Major carps and three exotic carp species viz. silver carp, grass carp, common carp, catla, rohu and mrigal were recorded timely. Structured questionnaires and annual work plans of Aquaculture Development Project (IFAD) and Beel-Baor Fisheries Development Project (Revenue) were used to collect information. Stocking density was the estimated numbers of fingerling per hectare water area. Catch compositions (Kg/ day/ ha) were recorded and collected from the daily catch records of the stocked carps. Rearing periods of carp stocked were measured from the mean daily catch data of different sizes of carp yields. The size frequency of different carp yields limits from 0.4 kg to 3.0 kg. Based on mean data of the carp yields per day, relationships among the cultured species were achieved for Purakhali LWB through correlation matrix. Through CVP analysis target sales volume (kg) each year were identified before undergoing operation into the CMLWB.

Source of Information: J.Soil.Nature. 3 (2):28-33 (July 2009)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Fishermen’s access into the LWBs will be significantly ensured in terms of their involvement into the decisional processes e.g. stocking, harvesting and cost decisions; investment into as well as enjoyment of profit there from. In CMLWB fruitful results were found from the same endeavors except some problems as financing. If soft and seasonal credit can be provided them the situation will be improved. Besides sometimes lease fees are so high due to bureaucratic “red tape” that fishermen can’t afford that.

Knowledge Management: Journal