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Larval Rearing and Observation of Larval Development of Freshwater Goby, Glossogobius Giuris; a Preliminary Study

Mst. Hasnahena
Department of Fisheries & Marine Bioscience, Faculty of Biological Science and Technology, Jessore Science & Technology University, Jessore-7408, Bangladesh

Md. Sherazul Islam
Department of Fisheries & Marine Bioscience, Faculty of Biological Science and Technology, Jessore Science & Technology University, Jessore-7408, Bangladesh

Md. Rezwanul Hasan
Department of Fisheries & Marine Bioscience, Faculty of Biological Science and Technology, Jessore Science & Technology University, Jessore-7408, Bangladesh

Aeyrin Afroz
Department of Fisheries & Marine Bioscience, Faculty of Biological Science and Technology, Jessore Science & Technology University, Jessore-7408, Bangladesh

Dilshad Milky Tuly
Department of Fisheries & Marine Bioscience, Faculty of Biological Science and Technology, Jessore Science & Technology University, Jessore-7408, Bangladesh

Abstract/ Executive Summary:

The artificially propagated larvae of freshwater goby, Glossogobius giuris were reared for the first time in the aquarium condition in Bangladesh. The larvae were reared in two different stocking densities and development stages observed for both. The larval development progress were examined under electronic microscope and stages were categorized into five distinguish stages on the basis of their ontogenetic development with time. In the first stage, the pigmented eye and large yolk sac was clearly visible within 12 hours of hatch. In the second stage within 24 hours of hatching yolk sac partially reduced, tail thickened, turbid yolk sac turned to be diluted. The yolk sac was convex interiorly and become tubular due to greater absorption of yolk sac interiorly in the third stage within 48 hours of hatching. Notochord and otolith development were also noticed in this stage. In the fourth stage, within 96 hours, mandible and myomeres were developed. In the last observed stage, the yolk sac completely disappeared within 100-120 hours of hatching.

Keywords: Glossogobius giuris, Larval rearing, Larval development

Location: Laboratory of Department of Fisheries & Marine Bioscience (FMB), Jessore Science & Technology University, Jessore

Start Date: 00-07-2012

End Date: 00-08-2012

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

1. To rear larva under control condition

2. To examine larval developmental stages of the species, Glossogobius giuris.

Methodology:

The experiment was conducted in the laboratory of Department of Fisheries & Marine Bioscience (FMB), Jessore Science & Technology University, Jessore, Bangladesh during July-August, 2012. The experiment was designed into two distinguish segments; i) Larval rearing and ii) Examine larval development stages. Glass aquariums (20 liters) were used for the rearing. For the rearing of larvae, there were two treatments i) 1000 larvae/aquarium ii) 1500 larvae/aquarium. The two different treatments were provided the same feed. The water parameters, such as pH, DO, temperature were recorded twice in a day. The water was exchanged about 25% and wastes were siphoned out by siphoning tube every day. pH and DO was measured by pH meter (EZoDO, 7200; Taiwan ) and DO meter (LTLutron YK-22DO; Taiwan) respectively. Larvae were collected from the same laboratory which was produced by inducing first time in the country. By using glass jar and scoop net larvae were separated from their parents as soon as they were hatched. From the fourth day of stocking when noticed yolk sac was absorbed, boiled egg yolk was supplied as feed. The boiled egg yolk was homogeneously mixed with water by filtering with cotton net before supply. The larval developments were observed under electric microscope (BoEco, Germany). The pictures were taken by a digital camera (Sony, Model DSC-W520) from the eyepieces of the microscope. In addition, pictures were drawn manually by the microscopic observation. Larval development stages were categorized according to their ontogenetic development.

Source of Information: International Journal of Biosciences | IJB |; ISSN: 2220-6655 (Print) 2222-5234 (Online); Vol. 3, No. 11, p. 198-204, 2013

Article Link (Online Journal): http://www.innspub.net; doi: http://dx.doi.org/10.12692/ijb/3.11.198-204

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Though the larvae of G. guiris was possible for the first time to rear until their larval development stage but showed mass mortality during transition period; larvae to post larvae. Further study and more precise examination needed for the rearing technique of the larvae and for the recognization of the development stages.

Knowledge Management: Journal