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Comparative Study on Length-weight Relationship and Condition Factor Between Hormone Treated and Non-treated Tilapia (oreochromis Niloticus)

M S Aziz
Department of Aquatic Resource Management, Sylhet Agricultural University, Sylhet -3100, Bangladesh

M J Islam*
Department of Aquatic Resource Management, Sylhet Agricultural University, Sylhet -3100, Bangladesh

M Kunda
Department of Aquatic Resource Management, Sylhet Agricultural University, Sylhet -3100, Bangladesh

Abstract/ Executive Summary:

The present study comparing the Length-Weight relationships and condition factor of Hormone Non Treated (HNT) and Hormone Treated (HT) tilapia (Oreochromis niloticus) for 99 days from the May 5 to August 12, 2014 in different cages of pond at Sylhet Agricultural University. There were two treatments with six replications each where HNT stocked in treatment I and HT stocked in treatment II with same stocking density. Length and weight were taken randomly collected 16 individuals from each of the cases at 15 days interval throughout the study period. The length-weight relationships of HT and HNT were found Log W=-2.140194+1.196176 Log L and Log W=-2.111263+1.179839 Log L, respectively where the exponential value (b) for HT and HNT were 1.20 and 1.18. The growth trends were found to be allometric type from the present investigations both in HT and HNT. The coefficient of determination (r² ) value found 0.9411 and 0.9294 respectively in HT and HNT tilapia. The values of condition factor (K) found to vary from 2.101-2.267, and 1.870-2.263; for HNT and HT respectively, and the mean values of the condition factor recorded for HNT and HT were 2.165 and 2.116, respectively. The present study concluded that performance of HT and HNT tilapia is almost same within three months of research.

Keywords: Hormone treated, Non-treated, Tilapia

Location: Sylhet Agricultural University Campus pond

Start Date: 05-05-2014

End Date: 12-08-2014

Program Area: Socio-economic and Policy

Non-commodity: Comparison

Objectives:

The present study has been undertaken to determine the length-weight relationships of hormone treated and hormone non-treated tilapia as well as to know the condition factor of hormone treated and hormone non-treated tilapia.

Methodology:

Location and duration of the study The study was conducted in cage culture from 05 May to 12 August 2014 at Sylhet Agricultural University Campus pond to observe length-weight relationship and condition factor between hormone treated and hormone non-treated tilapia (Oreochromis niloticus). Stocking and feeding of fry in each cage The experiment consist of 2 treatment i.e. hormone treated (T2) and hormone non-treated (T1) and each treatment were 6 replication total 12 replications i.e. T1R1, T1R2, T1R3, T1R4, T1R5, T1R6 (hormone non- treated) and T2R1, T2R2, T2R3, T2R4, T2R5, T2R6 (hormone treated) respectively. The stocking densities were maintained in each cage 105 fry. Total fry were in 6 cages (105*6) =630 (HT) and another 6 cages 630 (HNT). Feeding was started with commercial feed (floating feed) at 30% of body weight of fish at first month and gradually reduced up to 4% of body weight at the last month of study. Sampling procedure and Measurement of weight and length Weight and length of each individual fish was measured by using a sensitive weighing balance (Digital scale model no: AFD (Ek-300i, Max-300g, D-0.001g, E-0.1g) and a measuring scale, respectively at 15 days interval. The length was measured as distance from the snout to the tip of the caudal fin. For sampling purpose length and weight of randomly collected 16 individuals were measured and recorded from each of the cages i.e. total 96 of HNT and 96 of HT at every 15 days interval throughout the study period. Length-Weight Relationship To determine the length-weight relationship a total of 192 fishes were taken randomly from 12 cages (96 HT+96 HNT) of each sampling. Then total length (cm) and weight (g) of individual fish of each species were measured. Among the recorded data, the lowest and highest total length were determined and the range was divided into 10 class intervals. Then the frequencies were found out on the basis of class intervals. The regression line of length weight relationship for each species was drawn by plotting body weight data against total length data. Again, all the mid values (cm) of the class intervals and the corresponding average weight (g) were converted to base log10 to obtain straight line relationship between length and weight. Calculations for hormone treated and hormone non treated tilapia was done separately and also combined using the conventional formula described by Le-Cren (1951)

Source of Information: J. Sylhet Agril. Univ. 2(1):79-85, 2015 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The values of condition factor (K) found to vary from 2.101-2.267, and 1.870-2.263; for HNT and HT respectively, and the mean values of the condition factor recorded for HNT and HT were 2.165 and 2.116, respectively. The present study concluded that performance of HT and HNT tilapia is almost same within three months of research.

Knowledge Management: Journal