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Lengths, Length-length Relationships and Condition Factor of Indian Catfish Gagata Cenia (hamilton, 1822) in the Padma River, Bangladesh

Nipa Chaki
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh

Md. Abdur Razzaq Joadder
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh

Md. Foyzul Hassan Fahad
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

This study described some biological parameters including lengths, length-length relationships and Fulton’s condition factors of Gagata cenia in the Padma River of Bangladesh, based on 1120 specimens collected from May to November, 2012. Maximum 39.78% female fishes were belonging to the length category of 55-60 mm whereas 51.06% male were belonging to 50-55 mm.The highest mean total lengths were found 66.51±10.28 mm (combined sex), 70.12±09.49 mm (female) and 61.08±09.45 mm (male) in the month of June. Similar findings are also presented for standard length, fork length, body depth, dorsal length, pectoral length, pelvic length and anal length. Linear relationships were also studied among mentioned lengths. Strong positive correlations were observed in all cases. Speraman’s Rank test indicated that there was a strong, positive correlation between total length and condition factor in female, which was statistically significant (rs=0.210, P=0.044). In male, there was no significant correlation between these two (rs=0.167, P=0.262). The Mann- Whitney U-test showed that the female individuals had the highest condition factor (Mean rank of 79.76). There was a statistically significant differences in the Fulton’s condition factor between males and females (two tailed, Mann-Whitney U = 1324).

Keywords: Gagata cenia, Padma River, Length-length relationship, Condition factor

Location: Padma River at the Rajshahi City Corporation area

Start Date: 00-05-2012

End Date: 00-11-2012

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

This study would provide basic information on the lengths, length-length relationships (LLRs), and condition factor of G. cenia that would be useful for fishery biologists or managers to impose adequate regulations for sustainable fishery management in the Padma River and nearby areas of Bangladesh.

Methodology:

Sampling area and duration: Samplings were conducted in the Padma River at the Rajshahi City Corporation area (Latitude 24° 22' North; Longitude 88° 35' East). Fish specimenswere collected for seven months from May 2012 to November, 2012. Sampling framework and measurements: A total of one hundred and sixty (160) specimens were collected every month for study. Fish specimens were collected with the help of fishermen who used their own fishing nets, traps and craft for capturing this fish. Collected specimens were preserved in 10% buffered formalin solution. After collection they were brought to the laboratory of the Department of Fisheries, University of Rajshahi and preserved in labeled plasticfor further study. Total length (TL), standard length (SL), fork length (FL), dorsal length (DL), pectoral length (P1L), pelvic length (P2L) and anal length (AL) of the collected specimens were measured. All the measurements were taken by digital slide calipers. Study of length-length relationships: Following relationships were studied: TL vs. SL, TL vs. FL, SL vs. FL, TL vs. DL, TL vs. P1L, TL vs. T2L, TL vs. AL by linear regressions for males, females, and combined sexes separately. The relationships among all body parameters were calculated by least square method to fit a simple linear regression as: Y = a+bX Where Y = various body lengths, X=total length, a = Proportionality constant, and b = Regression coefficient Condition factor: The Fulton’s condition factor (K) was calculated using the following equation, K =100× (W/L3) (Htun-Han 1978) Where W is the body weight (BW) in g, and L, the standard length (SL) in cm. Statistical analyses: Statistical analyses were done using computer software Statistical Package for Social Science (SPSS) version 15.00 and Microsoft Excel 2007.

Source of Information: Journal of Fisheries Volume 1 Issue 1 Pages: 22-29 December 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Though the amount of catch of G. cenia is not much in water bodies of Bangladesh but it is important from the point of view of biological conservation.The present research findings would help to update and enhance the existing morphological measurements of G. cenia in both Bangladesh and outside the country. Condition factors would allow biologist to understand its population status and future success. Further in depth research efforts on other aspects of G. cenia, which are not included in present study, are recommended.

Knowledge Management: Journal