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Assessment of Reproductive Activity of Hilsa and Status of Jatka and Grown Up Hilsa at Major Nursery Grounds

Dr. Khan Kamal Uddin Ahmed
Senior Scientific Officer
Riverine Station, Bangladesh Fisheries Research Institute, Chandpur

Md. Robiul Awal Hossain
Scientific Officer
Riverine Station, Bangladesh Fisheries Research Institute, Chandpur

Mrs. Tayfa Ahmed
Scientific Officer
Riverine Station, Bangladesh Fisheries Research Institute, Chandpur

Abstract/ Executive Summary:

Experimental fishing was done using gill net of meshes 18, 20, 22, 25 and 30 in the different nursery grounds of hilsa. Catch per unit effort (CPUE) of gill net ranged from 0 to 161 jatka/net/30 min. Higher CPUE of gill net found in the major nursery grounds of Meghna (Eshanbala and Mohonpur) followed by Hizla of Lata river. A diurnal variation in of jatka catch was observed. Jatka are seems to be light sensitive, the higher catch of jatka was observed during dawn to dusk. Fishers used gill nets of meshes 5.5-16.5 cm for capturing hilsa, the number of haul per day ranged from 1.0-3.0. A wide variation in CPUE of gill nets (1.2-25.5 kg/net/day) was observed. The highest CPUE values were reported from Meghna river system followed by Tetulia and Bigha rivers. Fishers' using behundi net of meshes 0.2-5.0, the number of haul per day of behundi jal ranged between 1.0 and 4.0. Catch of jatka (kg/net/day) was found to vary between 0.05 and 8.67 along with other species. The highest amount (8.67 kg/net/day) of jatka catch was estimated from Agunmukha river, Patuakhali followed by Meghna (6.51 kg/net/day) and Dharmaganj river (4.75 kg/net/day).

Keywords: Assessment, Reproductive activity, Hilsa, atka, Nursery grounds

Location: Chandpur (Major river & estuaries)

Start Date: 01-07-2005

End Date: 30-07-2006

Program Area: Resource Development and Management

Commodity: Hilsa

Objectives:

To investigate the maturity and recent spawning status of hilsa; to study the degree of abundance and distribution of jatka at major nursery areas; and to study the catch per unit effort (CPUE) and landing status of grown up hilsa.

Methodology:

Monitoring fishers' catch of different fishing gears was included catch-effort and catch composition data of juvenile (jatka) and hilsa. Experimental fishing was also employed using gill nets of different meshes (18, 20, 22, 25, 30 mm). Juvenile/hilsa landing data was monitored around the lower Meghna and compare them with the recent past years' data. Similar comparison was made for catch-effort data. As such, impact of fishing ban for a certain period at the lower Meghna was assessed. The following gears were considered under study: Gill net (Chandi, Gulti and Current jal), Set bag net (Behundi jal) and Seine net (Moshari, Kona and Jagat ber jal). Classical "Light and dark bottle" technique was followed for estimating primary productivity. Monthly sample was collected from the sub-surface water (15 cm below the surface). Analysis of variance (ANOVA) was applied to test the treatment effects of different water quality parameters on the phytoplankton, zooplankton, macro-benthic fauna, primary production and juvenile/hilsa yield.

Source of Information: Annual Research Program 2005-06. BFRI, Mymensingh.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Five lakh

Total Budget (Tk.) : Five lakh

Achievement/Findings:

Comprehensive knowledge on the size and age of hilsa maturity and quantification of hilsa fecundity; the major spawning and nursery grounds of hilsa will be identified and delineated; and provide information for hilsa sanctuary operation policy guidelines and management.

Knowledge Management: Report/Proceedings