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Nursing and Rearing of Macrognathus Aculeatus at Different Stocking Densities in Pond Culture System

S.M. Farid
Department of Fisheries, Ministry of Fisheries & Livestock, Bangladesh, Dhaka

M.I. Miah
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202.

M.A.B. Habib
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202.

M.M. Hasan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202.

A.K.S. Ahammad
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

Nursery rearing of Macrognathus aculeatus was studied in relation to varying stocking densities for a period of six weeks from 20th July to 2nd September, 2005 in earthen ponds. The growth performances of Tarabaim (ADG, SGR and survival rate) were found to be better at a stocking density of 0.2 million fry/ha when fed diet finely powdered mustard oil cake and rice bran (3:2 ratio) with a protein content of 22.36% than other diets. Stocking density had significant effect on the growth, survival and production of fish fry. The physico-chemical and biological characteristics of water were found to be in optimum ranges for the fish culture. It is clear that survival rate and growth of fry were inversely related with the stocking density. However, results were indicated that the nursery operators may stock M. aculeatus at 0.2 million fry/ha for achieving satisfactory growth performance and survival rate during nursing stage.

Keywords: Nursing, Macrognathus aculeatus, Stocking density, Growth, Fry

Location: Field Laboratory Complex of the Faculty of Fisheries, Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 20-07-2005

End Date: 02-09-2005

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

1. To find out the effects of stocking densities on the survival, growth and production of M. aculeatus fry; and to find out optimum stocking densities in nursing of M. aculeatus spawn.

Methodology:

Duration and study area: The experiment was conducted in nine earthen ponds for a period of six weeks from 20th July to 2nd September, 2005 in three treatments with three replications following the completely randomized design in the Field Laboratory Complex of the Faculty of Fisheries, Bangladesh Agricultural University (BAU), Mymensingh. Three stocking densities of fry viz. 0.20, 0.30 and 0.40 million/ha considering three treatments were maintained. Selection of ponds, pre-stocking, stocking and post-stocking management, analysis of water quality and statistical analysis were done. Supplementary feeding: Pond conditions were monitored twice a day to observe any abrupt change in the behavior of fishes or colour of water. Supplemental feed consisting of finely powdered mustard oil cake and rice bran (3:2 ratio) with a protein content of 22.36% were given in ponds daily at the rate of 8 kg /0.1 million of stocked fry for the 1st and 2nd week and thereafter it was increased by 2 kg/0.1 million fry/week.

Source of Information: J. Agrofor. Environ. 3 (1): 101-104, 2009; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The growth performances of Tarabaim (ADG, SGR and survival rate) were found to be better at a stocking density of 0.2 million fry/ha when fed diet finely powdered mustard oil cake and rice bran (3:2 ratio) with a protein content of 22.36% than other diets. Stocking density had significant effect on the growth, survival and production of fish fry. The physico-chemical and biological characteristics of water were found to be in optimum ranges for the fish culture. It is clear that survival rate and growth of fry were inversely related with the stocking density. However, results were indicated that the nursery operators may stock M. aculeatus at 0.2 million fry/ha for achieving satisfactory growth performance and survival rate during nursing stage.

Knowledge Management: Journal