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Captive Breeding and Seed Production of Selected Estuarine Finfish.

Dr. S.B. Saha
Chief Scientific Officer
Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna

Debashis Kumar Mondal
Scientific Officer
Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna

Md. Farajul Kabir
Scientific Officer
Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna

Abstract/ Executive Summary:

The matured males and females of mugil (L. parsia) were selected on the basis of their morphological criteria. The female broods were 18~21 cm in total length and 80~100g in weight while the males were 15~19 cm and 45~70g. Three types of hormones viz., carp pituitary extract, human chorionic gonadotropin (HCG) and Ovaprim were used. In case of both male and female, a single dose (2 ml/kg body wt.) of hormone was injected in deep muscle at the base of the dorsal fin. The stocking ratio of male and female was 1:2. A continuous current flow was maintained for 34 hrs and then stopped for creating calm situation for pairing of the fish. The spawning activity appeared to continue first after 35~36 hours of post injection. The fertilized eggs were observed under microscope and after six hrs of fertilization it was found that development of fertilized eggs was stopped before formation of the embryo (blastula stage). In all other cases, no courtship or spawning was observed.

Keywords: Captive breeding, Seed production, Estuarine finfish, Brackishwater

Location: Paikgacha, Khulna

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Finfish

Objectives:

The goal or broad objective of the project is to develop captive breeding, seed production and culture technique of important brackish water finfish species, Liza parsia. In achieving the goal, experiments will be conducted in the FY 2012-13 with the following speficic objectives: To optimize the hormones and dosages in breeding of Liza parsia.

Methodology:

Matured males and females of Liza parsia were collected from the on station ponds and adjacent ghers and stocked in one of the on-station ponds. Salinity of brood pond was 13-18 ppt. Broods are fed twice daily with commercial pellet feed (30% protein). For preparation of saline water (25‰) for breeding, 120‰ brine was collected from salt bed. Brackishwater was bleached @ 25 ppm for disinfection. After three days, vigorous aeration was provided to reduce the action of chlorine. Finally, water was treated with sodium thiosulphate to neutralize residual chlorine. For disinfection, brine was treated with 10 ppm formalin and kept undisturbed for three days. Then brine was mixed with brackish water in a separate tank to prepare 25‰ saline water. The spawning activity appeared to continue first after 35~36 hours of post injection. The active male surrounded by couple of females maintaining a position slightly behind the female and later took parallel position. The first release of a small number of eggs stimulated the male to release spermatozoa. The female then respond with a jerk and release huge eggs, while spawning males stayed besides females close to the tail and fertilizes released eggs as soon as those scattered. The fertilization rates (%) were 70±7, 65±5 and 57±7 in November, December and January trials respectively.

Source of Information: Annual Research Program 2012-13. BFRI, Mymensingh.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Twenty lakh ten thousand

Total Budget (Tk.) : Twenty lakh ten thousand

Achievement/Findings:

The reproduction period of Liza parsia was November to March with two peaks in the months of December and February. They was also observed that the maximum GSI values obtained for male and female were 1.49% and 14.71%, respectively in the month of February.

Knowledge Management: Report/Proceedings