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Reproductive Periodicity, Fecundity and Sex Ratio of Goldfish Carassius Auratus (perciformes: Cyprinidae) Under Laboratory Condition

Ruhul Amin
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh

Farida Mazumder
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh

Akhtar Nargis
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh

Mahmuda Khatun
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh

Debashish Talukder
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh

Abstract/ Executive Summary:

The present study showed that Carassius auratus, breeds within September to March in freshwater and laboratory condition. It is a single breeder and highest percentage of gravid female occurs in December (87.5%). The GSI and GLI ranged from 2.43 to 8.0 and 2.38 to 25.03 respectively. Both GSI and GLI were highest in December (8.0) and (25.03) but lowest value of GSI was in September and GLI was in August. The mature and ripe ova occur in December (1.48±0.03), January (1.42±0.04), and February (1.39±0.07). The relationship between fecundity and total length; fecundity and body weight; fecundity and ovary weight were - 11545+1066x, r = 0.64; - 62418+2402x, r = 0.87 and - 11494+13x, r = 0.99 respectively.

Keywords: Ornamental fish, Fecundity, GSI, GLI

Location: Local market, Rajshahi

Start Date: 00-01-2011

End Date: 00-12-2012

Program Area: Animal Health and Management

Commodity: Goldfish

Objectives:

In Bangladesh, there has been only one work done so far which focused only on induced breeding, embryonic and larval development of Carassius auratus, but no work has been done on reproductive periodicity, fecundity and sex ratio under laboratory condition in the country. So, an attempt was made to determine their reproductive periodicity, fecundity and sex ratio under laboratory condition.

Methodology:

A total of 428 fish were collected from local market, Rajshahi, from January, 2011 to December, 2012. The fish were collected monthly, and cultured in aquarium (2½´× 1½´ × 2½´). The total length (TL) and body weight (BW) were taken to the nearest (mm) and (0.01 g) respectively. The pH value ranged from 7.8 to 8.3 and temperature of the water was from 9.5 to 28?C. The ovaries were dissected out intact and their lengths and weights were taken. Excess moisture was removed from the surface of the fish as well as from the ovaries with blotting paper before their weight was taken. Sexes were distinguished by comparing shape of the body and abdomen.

Following methods were applied for the study of the reproductive cycles: (1) Percentage of the gravid females against female (2) Gonado-Somatic Index (GSI) (3) Gonadal Length Index (GLI) and (4) Diameter of the ova (5) Coloration of gonad.

ly from anterior, central and posterior region of the ovary with the help of ocular micrometer. The spawning period was estimated from the gonad development, Gonado-Somatic Index (GSI), Gonadal Length Index (GLI), direct observation of the gonads and monthly variations of individuals in different maturity stages.

Source of Information: IOSR Journal of Agriculture and Veterinary Science (IOSR-JAVS) e-ISSN: 2319-2380, p-ISSN: 2319-2372.Volume 3, Issue 1 (May. - Jun. 2013), PP 36-41 www.iosrjournals.org

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

As in our country, goldfish is an imported fish and it costs a lot of money each year importing ornamental fish to meet up the demand of the aesthetic minded people as well as the requirement of the country. So it is necessary to know about the culture of this fish in freshwater condition. For this reason, this research is worked done about different reproductive aspects of C. auratus.

Knowledge Management: Journal