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Estimation of the Fecundity of Threatened Pethia Ticto

Md. Abdullah Akanda
Department of Fisheries, Mithamoin, Kishoreganj, Bangladesh.

Md. Moshiur Rahman
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh, Bangladesh.

Md. Fakhrul Islam
Department of Fisheries, Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University, Melandah, Jamalpur, Bangladesh.

Abstract/ Executive Summary:

In order to estimate the fecundity of threatened small indigenous fish species, tit Punti (Pethia ticto), an investigation was done at the Field Laboratory Complex, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh during June to August 2017. The mean total lengths were 5.39 ±0.58, 5.20 ± 0.43, 5.79 ± 0.97 cm and mean ovary weights were 0.45 ± 0.20, 0.38 ± 0.15, 0.53 ± 0.26 g for the month of June, July, and August, respectively. The fecundity of P. ticto for the month of June was estimated to be 1120-13892 with a mean of 5319.62 ± 3169.16, for the month of July it was 1071-12325 with a mean of 5407.68 ± 3186.82 and for the month of August, it was 2268-14328 with a mean of 5919.92 ± 3436.29. The gonadosomatic index (GSI) were 16.62 ± 3.35, 19.01± 4.55 and 14.75± 2.53 for the month of June, July, and August, respectively. The highest GSI was observed in July (25.77) and the lowest was 10.53 in June. Information on fecundity and GSI of P. ticto will be helpful for the artificial propagation, conservation, and management of this fish species.

Keywords: Indigenous fish; Threatened; Fecundity; GSI; Pethia ticto

Location: Field Laboratory Complex, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh.

Start Date: 00-06-2017

End Date: 00-08-2017

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To determine the fecundity and GSI of P. ticto from Mymensingh region of Bangladesh.

Methodology:

The work was conducted at the hatchery of the Field Laboratory Complex, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. The experiment was done from June to August 2017. The brood fish were collected from the ponds of the Field Laboratory Complex, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. About 150 P. ticto both males and females were collected from the source in the months of June, July, and August 2017. The breeder’s body structure was easily identified on the basis of external features of their abdomen, vent, and pectoral fins. The female abdomen is enlarged; a soft touch (during the breeding season) enables them to be identified correctly. The standard length and total length were recorded separately to the nearest centimeter-scale respectively. The standard length was measured from the anterior part of the head with the jaws closed, to the base of the caudal fin. The total length was measured from the anterior part of the head with the jaws closed, to the posterior end of the caudal fin. The measurement was taken along a straight line and was not taken along the curved of the body. A steel scale was used to measure the length of the body. The weight of the specimens was taken by an electric balance and the weights were recorded to the nearest 0.01 g gram. The recording of the gutted weight of the fishes was not considered because of the small or insignificant size of the stomach. The collected fishes were brought to the dissection tray and the abdomens of the fishes were cut to expose the gonads. The fishes were dissected out by scissors starting from anus to the lower jaw and the belly was opened. The whole mass (stomach, intestine, and ovary) were removed carefully from the ovarian wall by means of fine forceps and a soft brush. The ovary of the individual fish was taken out carefully and preserved in 10% buffered formalin. The preserved ovary of each fish was taken from the buffered formalin and washed and cleaned with distilled water. Excess moisture was removed as consistently as possible by tissue paper. Then the ovary was weighted to the nearest 0.01 g by an electric balance. The gonadosomatic index has been using as an indicator of gonadal development. The increase in GSI during the period of gonad maturation is mainly due to the deposition of a large amount of protein and lipid in the developing eggs and spermatozoa. Part of these materials come directly from ingested food but a major proportion comes from reserves of food deposited during the active feeding season in organs such as the liver and muscles.

Source of Information: Asian Journal of Fisheries and Aquatic Research- 10(3): 1-6, 2020

Article Link (Online Journal): DOI: 10.9734/AJFAR/2020/v10i330181

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Tit punti, P. ticto is a threatened SIS in Bangladesh. Information on reproductive biology, fecundity and GSI is important for induced breeding, conservation, and management of any threatened species. There is limited knowledge about stocks, habitats, behavior, fecundity, spawning of this species. Therefore, this study will provide the primary information about fecundity and GSI of P. ticto. The information of this study can potentially be used for the conservation, sustainable management, and artificial propagation of P. ticto population.

Knowledge Management: Journal