Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Some Aspects of the Reproductive Biology of the Catfish Heteropneu Stes Fossilis (bloch)(siluriformes: Heteropneustide)

Bimal Kanta Saha
Department of Zoology, Netrakona Government College, Netrakona

Md. Rafiqul Islam
Department of Zoology, Netrakona Government College, Netrakona-

Aparna Saha
Department of Zoology, Netrakona Government College, Netrakona-

Abstract/ Executive Summary:

Some aspects of the reproductive biology viz. sex ratio, fecundity and reproductive cycle of the catfish, Heteropneustes fossilis (Bloch.) were studied. The male and female ratios found to be I : 2.48. The fecundity ranged from 3,325 to 36,380 with a mean value of 17,658.42 ± 8,819.04 eggs. The relationships between the fecundity (F), total length (TL), standard length (SL), total weight (TW), gonadal length (GL), and gonadal weight (GW) found to be straight linear and positive. The mean of ova diameter was determined as 2.41 ± 0.77 mm

Keywords: Sex ratio, fecundity, reproducti ve cycle, gonado-somatic index

Location:

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Cat fish

Objectives:

To determine the sex ratio, fecundity and reproductive cycle of H. fossilis from Netrakona waters of Bangladesh.

Methodology:

A total of 230 specimens of Heteropneustes fossilis was collected during February 2004 to January 2005 from different fish markets of Netrakona town. After collection, the specimens were preserved in 10% formalin. The total length and standard length of the fishes were measured in the nearest mm by means of a measuring board fitted with a centimeter scale and their weights were recorded by means of a sensitive 'Pan Balance. The ovary of each female fish was removed and dehydrated with blotting paper when their weights were recorded. The colouration of the gonads was observed throughout the year. The reproductive cycle of H. fossilis was determined by using the following five methods: 1. Percentage of gravid females against time; II. Gonado-Somatic Index (GSI); IlI. Gonadal-Length Index (GLI); I V . Diameter of Ova (OD) and V. Colouration of Ovary.

Source of Information: J . Asiat. Soc. Bangladesh , Sci., 33(1): 51-56. J une 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Percentage of gravid females against time: The highest percentage of gravid females was found in the months April to August II. Gonado-Somatic Index (GSI): Higher values of GSI were calculated during the months from April to July with a peak value in June as 15.94 ± 5.45. III. Gonadal-Length Index (GLI) : The higher mean values of GLI were recorded in the month s of April to July with a peak mean value in June as 23.51 ± 0.63. IV. Diameter of Ova (OD): The maximum mean diameter of ova were recorded in the months of April to July with a peak mean value in June as 3.59 ± 0.11 mm. . V . Colouration of Ovary : The ovaries were found to change from reddish to deep green in colour. The ovaries of most females collected in June and July were found as deep blackish green in colour

Knowledge Management: Journal