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Biological Aspects of the Mola Carplet Amblypharyngodon Mola (cyprinidae) in the Payra River, Southern Bangladesh

Ferdous Ahamed
Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali, Bangladesh

Md. Rasel
Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali, Bangladesh

Newton Saha
Department of Fisheries Management, Patuakhali Science and Technology University, Patuakhali, Bangladesh

Motia Gulshan Ara
Department of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali, Bangladesh

Zoarder Faruque Ahmed
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Md. Yeamin Hossain
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Abstract/ Executive Summary:

Biological aspects including size at sexual maturity, breeding season and condition factor of Amblypharyngodon mola was studied in the Payra River, southern Bangladesh during February 2016- January 2017. All specimens were sexed and standard length (SL), body weight (BW) and gonad weight (GW) were measured. The gonadosomatic index (GSI) increased with the body size, however; the GSI rose sharply at 4.1 cm SL indicating the size at sexual maturity of A. mola. Monthly GSI was higher (average value > 8.0) during April to July with a peak in May, indicating this was the main breeding season. Fulton’s condition factor by months and SLs varied in both sexes and was attributed to variations in GSI with maturity. The findings of this study will be useful for the management and conservation of this important fishery in Bangladesh and neighboring countries.

Keywords: Standard length; Gonadosomatic index; Sexual maturity; Amblypharyngodon mola

Location: In the Payra River, Southern Bangladesh

Start Date: 00-02-2016

End Date: 00-01-2017

Program Area: Animal Health and Management

Commodity: Mola/Dhela/Dankina

Objectives:

Several studies have been conducted on the biology of A. mola including reproduction, feeding ecology and length-weight relationships. However, no studies were conducted on any of the biological aspects of this species from the Payra River. Therefore, the present study aimed to provide information on the biological aspects including size at sexual maturity, breeding season and condition factor of A. mola in the Payra River, southern Bangladesh.

Methodology:

The present study was conducted in the Payra River running through Patuakhali, a southern district of Bangladesh (straddling 22º 35´ N and 90º 26´ E). The river originated from the Tetulia River via the Karkhana River and finally falls into the Bay of Bengal by the name of Burishwar River. Monthly samples were collected from the small-scale fisher of set bagnet fishery in the Payra River during February 2016-January 2017. Set bagnet is a traditional fishing gear widely used by the small-scale fishers in the Payra River similar to trawl net having larger mesh size at mouth and wing, however; the mesh size gradually decreases to <2 mm and sometimes mosquito net at the codend. All collected specimens were preserved in 10% formalin and transferred to the laboratory for analysis.

The standard length (SL) of all individuals was measured to the nearest 0.1 cm using a measuring scale, while weight body weight (BW) was recorded using a digital balance to 0.01 g accuracy. Sex determination was done by incision of the abdomen of each individual and visual inspection of the gonad by the naked eye. All fat, connective tissue and blood vessels were carefully removed from the gonads and were weighed to the nearest 0.001 g. All fat, connective tissue and blood vessels were carefully removed from the gonads and were weighed to the nearest 0.001 g accuracy. The gonadosomatic index (GSI) was calculated for each female individual as: GSI (%) = (GW/ BW) ×100. The size at sexual maturity was estimated by the relationship between the GSI and SL. Breeding season was estimated based on the monthly variations of GSI. Fulton’s condition factor (K) was estimated using the equation: K = (BW ⁄ L3 ) × 100 for both monthly and in terms of size (SL cm) class.

Source of Information: International Journal of Fisheries and Aquatic Studies 2017; 5(4): 336-339

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, this is the first study on some biological aspects of A. mola in the Payra River, southern Bangladesh. The findings of this study would be useful for fishery biologists/managers to impose adequate regulations for the conservation of this important fishery in Bangladesh and neighboring countries.

Knowledge Management: Journal