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The Spawning Success and Egg Quality of Major Carps Under Varied Hormone Doses

M. Z. Haque
Fisheries Research Institute, Mymensingh-2201, Bangladesh

A. H. M. Kohinoor
Fisheries Research Institute, Mymensingh-2201, Bangladesh

S. C. Mahata
Fisheries Research Institute, Mymensingh-2201, Bangladesh

M. A. Mazid
Fisheries Research Institute, Mymensingh-2201, Bangladesh

Abstract/ Executive Summary:

Different doses of acetone-dried pituitary gland of common carps were used to assess the effects on spawning and egg quality of Indian major carps at two stages i. e. first at l-2 hr of post-fertilization. when eggs get water hardening and then at 16-18 hr of post-fertilization, when larval movement started. A total of 504 individual females of Catla Catla catla (Hamilton). Rohu Labeo rohita [Hamilton). Mrigal Cirrhinus mrigala (Hamilton) and Kalibaush L. cal basu [Hamilton) were used in the experiment. Significant effect of hormone dose was observed in Catla and Rohu both in spawning and egg quality. but in case of Mrigal and Kalibaush it was only in spawning

Keywords: Spawning success, Egg quality, Carps, Hormone

Location: The hatchery complex of the Fisheries Research Institute, Freshwater Station, Mymensingh

Start Date: 00-04-1992

End Date: 00-07-1992

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To study the effect of hormone doses (pituitary extracts of common carps) on spawning success and egg qualities of four major carps (Catla catla, La.beo rohita, Cirrhinus mrigala and L .calbasu) at 1-2 hr and 16-18 hr of post-fertilization.

Methodology:

The study was conducted at the hatchery complex of the Fisheries Research Institute, Freshwater Station at Mymensingh from April to July 1992. In this experiment 54 brood of female Catla. Catla catla (4.5 ±1.5 kg}.135 brood females of Rohu Labeo rohita (3 ± 1 kg). 225 brood females of Mrigal Cirrhinus mrigala (4 ± 2 kg) and 45 Kalibaush L. calbasu (3.5 ± 1.5 kg) were used. The male-female ratio was 3 : 2. The broods were selected by visual observation of external morphological characteristics (Haque 1988). Initially for each species. several screening tests were performed to find out the minimum dose of acetone-dried pituitary glands of common carps (APC) on the brood parents. The brood females were injected intramuscularly just below the pectoral fin and the brood males were injected at the base of pelvic fin. The females were injected twice, one preliminary and other resolving dose. The interval between injections was 6 hours. The males were injected one time at the time of resolving doses of female. After injection. both the sexes were released in a circular spawning tank (diameter 9 meter and depth 1 meter) where water flow was 500 1/minute. During the operation. single species was used at a time. The number of the broods used was according to their size and availability i. e. for Catla 6 females. for Rohu 15 females, for Mrigal 15 females and for Kalibaush 10 females. Fertilized eggs were collected after successful matings between males and females. A nylon hapa was fixed at the outlet of the tank to collect the fertilized eggs. Eggs were transported to the hatching circular tanks and funnels. The quality of eggs was determined twice, once just after water hardening i.e. 1 to 2 hr after fertilization, then after 16-18 hr when larval movements were observed in the egg shells. Fertilization rate can be established 1-2 hours post-fertilization. when fertilized eggs are to be transparent. Hatching can be determined 16-18 hr post-fertilization by observing the larval movement in the shell. The egg samples were drawn from 2-3 positions in the circular hatching tanks and funnels. The data were treated statistically to find the influence, if any. of different doses of APC on the spawning and egg qualities of the tested fishes.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 22(1) ; 79-84, 1996, ISSN 1016-6947

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present experiment. efforts were made to collect data on temperature which ranged from 25°C to 30°C in the hatchery water. The hardness of the water was 160 ppm and pH ranged from 7.2 to 7.6. Ahmed (1944) found a temperature between 25.5°C and 30.5°C in the natural breeding ground. This is similar to the hatchery water temperature. In the breeding of major carp, 5-6 mg PG/kg body weight of female and 2.0-2.5 mg PG/kg body weight of male is suitable. Further experiments are needed to study the effect of preliminary doses on egg qualities after fertilization. Significant effect of hormone dose was observed in Catla and Rohu both in spawning and egg quality, but in case of Mrtgal and Kalibaush, it was only in spawning.

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