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Fishing Intensity of the Halda River, Chittagong, Bangladesh

MOHAMMAD ARSHAD-UL-ALAM
Department of Zoology, Bandarban Government College, Bandarban Hill District

Abstract/ Executive Summary:

Fishing intensity of the Halda River was investigated for two years period from January 2007 to December 2008. The study examined the variation of number of fishing efforts among 34 gear types, 8 gear categories and three studied sections. Variations among months and between years were also studied. The total number of daily fishing efforts showed two peaks, the highest in October (0.6963 gear/ha/day with 24 types of gears during 2007 and 0.9068 gear/ha/day with 26 types of gears during 2008) and the 2nd one in April (0.5881 gear/ha/day with 20 types of gears during 2007 and 0.5689 gear/ha/day with 21 types of gears during 2008). The mean value of daily fishing efforts was found 0.4661±1407 gear/ha/day during 2007 and 0.5015±0.1784 gear/ha/day during 2008.The net fence had the highest number of efforts (0.1375±0.0619 and 0.1484±0.0495 gear/ha/day during 2007 and 2008 respectively) among 8 gear categories followed by cast net (0.1096±0.0352 and 0.1217±0.0505 gear/ha/day). Analysis of variance showed strong significant difference among number of efforts of different gear types (P<0.01) and gear categories (P<0.01). Most of the fishing gear showed significant difference in number of efforts between sections and months.

Keywords: Halda River, Fishing intensity, Number of fishing efforts, Fishing gear

Location: Chittagong district.

Start Date: 00-01-2007

End Date: 00-12-2008

Program Area: Resource Development and Management

Commodity: Aquatic animal

Objectives:

To study the intensity of different fishing gears of the River Halda.

Methodology:

Study area: The tidal River Halda is one of the tributaries of the Karnaphuli River system. It originates from Khagrachari Hill District of Bangladesh and meets with the River Karnaphuli at 15 km North of Chittagong Metropolitan City. It is 88 kilometer in length and 35 to 210 meters in width at the confluence of the river. The present study area was 39 kilometers in length which covered an area of 351 hectares of the river Halda. Total study area was divided into three sampling sections. Count of fishing efforts: The fishing gears used in the river Halda were counted during every fortnightly survey from January 2007 to December 2008. All types of gears found in the study area were counted separately for each location. Numbers of fishing efforts were counted for 24 hours of the day. Active day time gears were counted directly from 06:00 o’ clock to 18:00 o’ clock. Four journeys were made by engine boat (sampan) in each survey of the section to observe diurnal change in fishing pattern. Night time gears were confirmed by the questionnaire and by some night visit in the site. All types of gears counted separately during the survey. The fixed gears were checked in each journey. Maximum number of gears observed in all four surveys of the day noted in separate column for number of gears for the day. Cast nets and push nets were noted in total of all four journeys because of their ephemeral nature of operation. Gears of same kinds with different mesh size enumerated separately. As fishing activities depends largely on tidal situation and lunar cycle, survey program was set keeping that in mind. Survey form and questionnaire for fishing effort count and catch monitoring were developed using Flood Action Plan (FAP) -17 (Fisheries study, Department of fisheries, Bangladesh) survey forms. Statistical analysis: Three way ANOVA was tested to find the variation of number of fishing efforts among different gears, sections, months and between years. Coefficient of variation (CV) among months for each gear type and category, CV among gear types and among gear categories for each month were also tested.

Source of Information: Int. J. Int sci. Inn. Tech. Sec. A, Oct. 2013, Vol.2, Iss 5, pg 10-16

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The total number of daily fishing efforts showed two peaks, the highest in October (0.6963 gear/ha/day with 24 types of gears during 2007 and 0.9068 gear/ha/day with 26 types of gears during 2008) and the 2nd one in April (0.5881 gear/ha/day with 20 types of gears during 2007 and 0.5689 gear/ha/day with 21 types of gears during 2008). The mean value of daily fishing efforts was found 0.4661±1407 gear/ha/day during 2007 and 0.5015±0.1784 gear/ha/day during 2008.The net fence had the highest number of efforts (0.1375±0.0619 and 0.1484±0.0495 gear/ha/day during 2007 and 2008 respectively) among 8 gear categories followed by cast net (0.1096±0.0352 and 0.1217±0.0505 gear/ha/day). Analysis of variance showed strong significant difference among number of efforts of different gear types (P<0.01) and gear categories (P<0.01). Most of the fishing gear showed significant difference in number of efforts between sections and months.

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