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Growth Performance of Tilapia Fingerling in Cage in Ponds Managed by Adivasi Households: an Assessment Through Length-weight Relationship

N. Gupta
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. M. Haque
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. Khan
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

This study was conducted to assess the growth performances of cage reared GIFT strain of tilapia (Oreochromis niloticus) fingerling using length-weight (LW) relationship technique. Along with this, condition factor (K) of fish and pond water quality parameters were also brought under this study to have broader understanding. For LW relationship and K, a sample size of 120 fingerlings was made from randomly selected three different cages in a pond at Tarala village in Kaharole Upazila of Dinajpur District, Bangladesh. The length-weight relationship of tilapia fingerlings reared in cages managed by Adivasi people was significant. The value of correlation coefficient (r) and the coefficient of determination (r²) were 0.97 and 0.94 respectively. This suggests that growth of tilapia from fry to fingerling was normal in cages. The condition factor of different size group of fish was almost closed to 2, indicating fish health as satisfactory. All the water quality parameters including temperature, transparency, dissolved oxygen, ammonia-nitrogen, phosphate-phosphorus, nitrate-nitrogen and pH were within suitable range both in cages and outside the cage in pond. About 5 phyla and 25 genera of phytoplankton from Bacillariophyceae, Cyanophyceae, Chlorophyceae, Euglenophyceae and Rhodophyceae groups and one phylum and 5 genera of zooplankton from Rotifera group were found in cage installed in ponds. These all indicate the growth of tilapia fingerling in cages was satisfactory which was technically sound for landless adivasi households.

Keywords: Adivasi, Cage culture, Length-weight relationship, Condition factor

Location: Tarala village of Kaharole upazila in Dinajpur, Bangladesh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

The present study was undertaken to understand the growth performances of fish in cage in earthen ponds of adivasi households through length-weight relationship along with condition factor and some basic physico-chemical and biological parameters of pond water.

Methodology:

Determining Length-Weight Relationship: The samples of Genetically Improved Farmed Tilapia strain (GIFT) (Oreochromis niloticus) for lengthweight relationship determination were collected from the Tarala village of Kaharole upazila in Dinajpur, Bangladesh which is one of the villages where WorldFish Center implemented their development project with adivasi households. The adivasi households in this village were given low-cost net cages and tilapia fry to rear in the cages in their ponds. The pond where cages were set was of 166 decimal in size with a depth of 1.2-1.8 m. This was relatively a large pond where seven cages were installed for conducting the study. There were about 150-200 fish of 2.54 cm size in average stocked in each of the installed cages for rearing. After one and a half month of releasing the fry in cages, this study was started. Three cages were selected randomly and fishes were collected from the cages and put into the bucket with water and length and weight of 40 fishes were taken from each cage on the pond dike carefully. All together, 120 fishes were sampled and the data of length and weight of every individual was recorded. After this, fish were released to same cages again carefully. The total length of fish was measured from the tip of the snout to the margin of the tail. The individual whole fish was measured as body weight. The total length was taken to the nearest cm with a measuring scale and the body weight was taken to the nearest g with an electronic digital balance (CAMRY= Model: EK 3052). The relationship between length and weight of fish can be adequately described by the cubic or power curve equation: W = aLb, where W is total body weight (g), L is the total length (cm), a and b are the coefficients of the functional regression between W and L. Power curve equation can be transformed into linear form by the use of natural logarithms (symbolized as log). All data were log transformed and least squared linear regression performed with LogW = Log a + bLogW (Schneider, 2000). This equation was of the same form as the linear equation Y = a + bX. The value of LogW and LogL equated to Y and X respectively, and Log a and b equated to the intercept and slope respectively. Thus the data were treated as a linear regression by plotting LogW against LogL. Analysis of the water quality parameters For water quality parameters and phytoplankton study, samples were also collected from Tarala village. Three water samples were collected from each of the cages and outside the cages i.e; from pond in which the cages were set up. The water samples were kept in separate clean white plastic bottles and each was marked properly. Water temperature, transparency dissolved oxygen, ammonia-nitrogen, phosphate-phosphorus; nitrate-nitrogen and pH were analyzed and recorded on the dike of the pond. For each parameter three samples were tested. Water temperature was measured using a Celsius thermometer. Water transparency was measured using secchi-disc. Dissolved oxygen (mg/l), Ammonianitrogen (mg/l), Phosphate-phosphorus (mg/l), Nitrate-nitrogen (mg/l) and pH were determined using Sera Kits purchased from local aqua-input suppliers. The samples for plankton study from the cage installed pond in Tarala village were taken out in the Laboratory of water Quality and Pond Dynamics of the Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh for in-depth observations. For qualitative study, 1ml of collected sample was examined using a Sedgewick-Rafter (S-R) cell and a binocular microscope (Swift, M-4000) with phase contrast facilities. The Sedgewick-Rafter counting cell (S-R cell) is a special type of slide having a counting chamber which is 50 mm long, 20 mm wide and 1 mm deep; the volume of the chamber is 1 ml. The counting chamber is equally divided into 1000 fields, each having a volume of 0.001 ml. After pouring the sample, counting chamber was covered with a cover slip in order to eliminate the air bubbles and left to stand for 15 minutes to allow plankton to settle. All planktonic cells or colony forming units occurring in 10 randomly chosen fields were identified and counted under a binocular microscope (Olympus, M-4000D, Japan). Taxa were identified to genus level using keys from APHA (1992) and Bellinger (1992). Data processing, analysis and interpretation: Data were entered on the spreadsheet of the computer software, Microsoft Excel. Errors were detected and necessary corrections were made accordingly after data entry. Data were analyzed by using SPSS (Statistical Package for Social Science) windows version 11.5, which offered statistical tools applied to social science based research. Descriptive statistics including mean, standard deviation etc. were generated and presented in graphical and tabular forms.

Source of Information: J. Bangladesh Agril. Univ. 10(1): 149–155, 2012 ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Cage culture is a simple and quick installable technique of aquaculture. Adivasi people who are resource poor can easily adopt cage base fish fingerling production. The growth performances of fish in cages were encouraging in terms of length-weight relationship and condition factor, and cage culture did not affect the pond productivity and vice versa. As a result, it could be concluded that the growth of tilapia in cages with higher productivity might be an important livelihood strategy of poor and marginal households in the society of Bangladesh.

Knowledge Management: Journal