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Some Population Dynamics Aspect of Catla Catla (hamilton) in the Sylhet Basin, Bangladesh

A. K. Yousuf Haroon
Bangladesh Fisheries Research Institute, Riverine Station Chandpur-3602, Bangladesh.

Abstract/ Executive Summary:

Population parameters of Catla catla (Hamilton) were estimated using FiSAT software with length-frequency data collected from different areas of Sylhet basin, north-eastern part of Bangladesh. The von Bertalanffy growth parameters L∞ and K for the species were 93,95 cm and 0,53/year respectively. The annual rate of natural (M) and fishing mortality (F) were found to be 0.84 and 0,85, respectively. The mean length at first capture (l.c) was estimated as 11.29 cm. The rate of exploitation (E) was estimated as 0,503, Recruitment of this species into the fishery takes place during May to July. Peak recruitment occurred during the month of May. E_max was found to be 0.41. Their total length-total weight relationship was found to be W = 0.012TL3.04.

Keywords: Catla, Dynamics, Mortality

Location: Sylhet district

Start Date: 00-01-1998

End Date: 00-12-1998

Program Area: Resource Development and Management

Commodity: Carp fish

Objectives:

To estimate the key parameters of stock assessment and its population dynamics.

Methodology:

Length-frequency data of C. catla were collected fortnightly from the commercial catches at different landing sites around Sylhet district from January 1998 to December 1998. Samples of C. catla were mainly caught by purse sine net. Random samples of 823 specimens were collected. Total length was measured in cm by a meter scale (1 ± mm) of sizes ranging from 21.0 to 93.0 cm. The weight was measured in g by a Salter spring balance from 823 random samples ranging in weight from 111.50 -4, 200 g with corresponding length. The data were then pooled month-wise from different landing sites and subsequently grouped in to classes of three cm intervals. The data were analysed using the FiSAT (FAO-ICLARM Stock Assessment Tools) as explained in detail in the computer software package.

Source of Information: Pakistan Journet of Biological Sciences 2 (4): 1188-1192,1999, ISSN 1028-8880

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the results of the above parameters it could be concluded that the c. catla is a moderate sized fish having perfect growth rate. Recruitment pattern of the fish revealed that it recruits in to the fishery almost round the year and peak recruitment occurs in May. Its fishing pressure (F=0.85) is high and need to be reduced for getting more sustained production. Some fishing restriction should be imposed to get higher fish yield from that basin.

Knowledge Management: Journal