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Embryonic and Larval Development of Mystus Gulio (ham.)

M. Begum
Brackishwater Station, Bangladesh Fisherics Research Institute Paikgacha, Khulna 9280, Bangladesh.

H.K. Pal
Brackishwater Station, Bangladesh Fisherics Research Institute Paikgacha, Khulna 9280, Bangladesh.

M.A. Islam
Brackishwater Station, Bangladesh Fisherics Research Institute Paikgacha, Khulna 9280, Bangladesh.

M.J. Alam
Brackishwater Station, Bangladesh Fisherics Research Institute Paikgacha, Khulna 9280, Bangladesh.

Abstract/ Executive Summary:

Mystus gulio eggs arc strongly adhesive and contain relatively small yolk (0.75~1.0 mm). The egg envelop is thick and transparent. First cleavage (two cells), four cells, eight cells, sixteen cells and multi cells stages were found 20, 25, 35~40, 60 and 70 minutes after fertilization, respectively. The morula stage was visualized within 1.5 h after fertilization. The heart beat visible and the circulatory system commenced after 16 h of fertilization. Embryos hatched 18~20 h after activation of egg. The newly hatched larva measured 2.82±0.03 mm in length and 0.32±0.06 mg in weight. The yolk sac was fully absorbed by the third day though larvae commenced exogenous feeding even before completion of yolk absorption. A S-day old post larva hegan wandering in search of food. Ten-day old post larvae endowed with eight branched rays in dorsal fin and seven in caudal fin. Fifteen-day old post larvae had the pectoral spine become stout though the embryonic fin folds had to be disappeared. The length of fingerlings ranged from 25~30 mm after 30 days, and their external features were just like those of an adult except that they were not sexually matured.

Keywords: Embryonic development, Larval development, Ontogenic events, M. gulio,

Location: Brackishwater Station, Bangladesh Fisherics Research Institute Paikgacha, Khulna 9280, Bangladesh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

To study of the catfish to observe early developmental stages.

Methodology:

Mystus gulio brooders were collected from the reservoir ponds of the brackishwater station (BS) located in the south-west part of Bangladesh using cast nets. After a brief dip in potassium permanganate, the brooders were acclimatized in cisterns (4.5 X 1.5 X 1 m) without food. Spawning was introduced by an intramuscular injection of 1 ml/kg body weight of ovaprim. Each breeding set consisting of two males and one female was released into a breeding hapa (1.2 x 0.9 x 0.9 m) after injection. The behavior of brooders was observed frequently after injection and the spawning activity appeared to continue first after some 5 hours post injection, though its latency period is 6-8 hours. Fertilized eggs were collected every hour with the help of a dropper from the breeding hapa and observed its developmental stages. The eggs hatched out first after 18 hours of fertilization. When about 80% of hatchlings were observed with their absorbed yolk sac, feeding was given with boiled and screened hen's egg yolk. Newly hatched larvae and thereafter was also observed its developments. The lengths of the hatchlings were measured by ocular micrometer (1/100 fraction of a millimeter). Descriptions of the developing stages were made on the basis of examining eggs and larvae under microscope (Brand: CETI with JVC closed circuit digital camera and monitor) and digital still photographs of the developmental stages of eggs and larvae were also made.

Source of Information: Bangladesh Journal Fish. Res., 13(2),2009: 169-177

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Fish farmers are much less familiar with the culture of catfish species because of the lack of breeding and feeding techniques and non availability of seeds from the wild. Despite this small scale operation have been attempted for M. gulio and the culture of other catfishes e.g. Heteropneustes fossilis and Clarias batrachus have been achieved in the past. The high fecunditv, short embryonic period, fast development of sense organs of M. gulio suggest that it may be a suitable species for commercial seed production.

Knowledge Management: Journal