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Comparative Studies on Growth of Fry of Gift and Existing Strain of Nile Tilapia (oreochromis Niloticus L.)

R. Sultana
Dept. of Fisheries Biology & Genetics, BAU, Mymensingh

M.G. Hussain
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh

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

M.S. Islam
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh

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

Abstract/ Executive Summary:

Comparative study on the growth of fry in nursery system of Genetically Improved Farmed Til apia (GIFT) and Existing strain of Nile til apia ( Oreochromis niloticus) was performed. The trials were conducted in a series of hapa for two months. The initial mean weight of GIFT and Existing strains of tilapia were 1.03 and 1.12g, respectively and the stocking density for both the strains was maintained at 150/m 3 . Fishes were fed with supplementary feed 31.29% of protein level. After two months the final cumulative mean weight of GIFT and Existing strain were observed to be 8.38 and 5.51 g, respectively. The net gain for the weight of GIFT and Existing strain were estimated to be 666% and 368% and the mean survival was 95.75% and 81.25%, respectively. The GIFT strain showed significantly (P<0.05) higher net gain in growth in weight and also higher (P<0.01) survival than that of the Existing strain.

Keywords: 0. niloticus, GIFT, Hapa-net

Location: Freshwater Station, Bangladesh, Fisheries Research Institute, Mymensingh-2201, Bangladesh

Start Date: 00-01-1995

End Date: 00-03-1995

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

To compare the performances in growth and survival between GIFT and Existing strain, 0. niloticus in nursery conditions.

Methodology:

The study was conducted at the Fisheries Research Institute under its Freshwater Station for a period of two months (January to March 1995). Eight nylon net hapas (mesh size of 2.5 mm), 3.0 m 3 each (2.0 x 1.5 x 1 .0 m³ ) were set in a small well prepared 1000 m² pond with bamboo poles in two columns. Four hapas under treatment-! were stocked with fry of GIFT (1.02 ± 0.12 g) and the rest four hapas under treatment-11 with existing Nile tilapia (1.11 ± 0.03 g) at a stocking density of 150 fry/m³ • A prepared supplemental feed consisted of ingredients of rice bran (25%), wheat flour (30%), mustard oil cake (15%) and fish meal (30%) with crude protein level of 31.19% were supplied to the fishes twice a day at 8% (according to Guerrero 1987) of the total body weight. Thirty fry from each hapa were sampled at fortnightly intervals to assess the growth and the feeding ration was adjusted on the basis of the estimated weight of fish biomass. Water samples were taken at weekly intervals between 6:00 and 7:00 a.m. from inside the hapas during the trial and analyzed for assessing some environmental parameters viz. water temperature, pH and dissolved oxygen (DO). Statistical analysis with student 1 s t-test was incorporated on the data to see whether the two strains show any differences or not i.e., to identify the level of significance in differences, if any, in growth patterns and survival during the experimental period.

Source of Information: Bangladesh. Fish. Res., 1 (1) : 25-30

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The data of growth in length and weight, fortnightly gain, net gain and daily gain as mean values of GIFT and Existing strain of Nile tilapia ( 0. niloticus) are given. The initial mean length and weight of GIFT and Existing strains were 3.75 and 3.79 em and 1.03 and 1.12 g, respectively. After 60 days, the final cumulative mean growth in length and weight were recorded at 7.59 ± 0.77 and 6.44 ± 0.21 em and 8.39 ± 1.87 and 5.51 ± 0.29 g. The net gain for length and weight was estimated to be 102 & 70% and 666 & 368%, respectively. The mean survival rate of GIFT and Existing strains of tilapia were 95 and 81%, respectively. On the sequential fortnightly estimated mean values of length and weight of both the strains, the student t-statistic indicates insignificant differences (P>0.05) between the two strains in only the initial sampling whereas significant differences (P<0.05 and P<0.01) were found in all other samplings, with an exception for the weight (P>0.05) in the 3rd sampling. GIFT strain showed significantly higher (P<0.05) net gain and daily gain in growth (length and weight) and also higher (P<0.01) survival than that of the Existing strain. The physicochemical parameters of water revealed that the values of water temperature, pH and dissolved oxygen ranged from 18.67 ± 1.21 to 25.16 ± 2.29°C, 7.87 ± 0.48 to 8.01 ± 0.25 and 4.05 ± 1.36 to 5.97 ± 1.18 mg/1, respectively during the study period.

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