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Comparative Efficacy of Stocking Density on Growth and Survival of Fry of Mystus Vittatus in Nursery Ponds

Maliha Hossain Mou
Bangladesh Fisheries Research Institute, Freshwater Sub-Station, Saidpur, Nilphamari, Bangladesh

Khondaker Rashidul Hasan
Bangladesh Fisheries Research Institute, Freshwater Sub-Station, Saidpur, Nilphamari, Bangladesh

Saokat Ahamed
Bangladesh Fisheries Research Institute, Freshwater Sub-Station, Saidpur, Nilphamari, Bangladesh

Abstract/ Executive Summary:

Efficacy of different stocking density on the growth and survival of striped dwarf catfish, Mystus vittatus fingerlings in nursery ponds has been evaluated with three stocking density treatments (T) viz., T₁ - 8,000 fry dec^-1, T₂ - 12,000 fry dec^-1and T3 - 16,000 fry dec^-1. After seven weeks of rearing, survival of fingerlings was the highest (65.50±0.49%) in T₁ which was significantly higher than those of T₂ (55.50±0.21%) and T3 (49.00±0.70%) and also significant difference in final length (3.34-6.89cm) and final weight (3.32-7.92g) among the three treatments were observed. Physico-chemical variables of water and plankton abundance of different treatments were recorded and discussed.

Keywords: Mystus gulio, Fingerling, Stocking density, Survival, Growth

Location: Bangladesh Fisheries Research Institute, Freshwater Sub-Station, Saidpur, Nilphamari, Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Fish

Objectives:

To evaluate the effect of stocking density on the growth and survival of striped dwarf catfish, M. vittatus fries in nursery ponds.

Methodology:

Effect of stocking density on the growth and production of striped dwarf catfish, Mystu vittatus was carried out in nine nursery ponds. The ponds (2.5 decimal each with an average depth of 1.0 m) were prepared by sun drying followed by liming soil with CaO @ 1 kg dec^-1 and then filled with underground water up to 100 cm depth and enclosed by fine nylon mosquito net. Water of the ponds was treated with rotenone @1.5 ppm to kill unwanted fishes. After 5 days, particular pond was fertilized with Urea @ 100 g dec^-1, TSP@ 75g dec^-1 and Cattle dung@ 6 kg dec^-1. Five days after fertilization, the nursery ponds were sprayed with sumitheone 10 ml dec^-1 to kill harmful insects and predatory zooplankton. After twenty four hours of spreading of sumitheone, seven days old hatchlings (average length 0.83 cm) of M. vittatus were stocked as given in the experimental design in all ponds. From the second day of stocking, fish hatchlings were fed thrice daily with maintaining following feeding schedule for about 10,000 hatchlings. Growth and well being of the fries were checked at weekly interval. Physicochemical parameters of water viz., water temperature (ºC), transparency (cm), dissolved oxygen (DO) (mg l^-1), pH, total alkalinity (mg l^-1) and ammonia (NH₃) (mg l^-1) were weekly determined by using a Celsius thermometer, a Secchi-disk, a portable dissolved oxygen meter (HI 9142, Hanna Instruments, Portugal), a portable pH meter (HI 8424, Hanna Instruments, Portugal) and a portable ammonia test kit (Hanna), respectively. Total alkalinity was determined following the titrimetric method according to the standard procedure and methods (Clesceri et al., 1992). Plankton from the nursery ponds were collected in every week for quantitative and qualitative estimation. Ten liters water samples was collected from each replicate experimental ponds and then filtered through bolting silk plankton net (25 μm) to obtain a 50 ml sample. The collected samples were preserved immediately with 5% buffered formalin. Plankton was expressed as cells per liter of water of each pond. The quantitative and qualitative analysis of phytoplankton and zooplankton were done according to Stirling (1985) [27] and Needham (1963), respectively. After 7 weeks of nursing, fish fries were harvested first by repeated netting, followed by draining the ponds with consequent growth and production parameters viz., specific growth rate (SGR), feed conversion ratio (FCR) and survival of fingerlings were estimated. Specific growth rate (SGR %day) and feed utilization efficiency were calculated according to Ricker (1975) [19] respectively as follows: SGR (%/day) = In [W.sub.2] - In [W.sub.1]/[T.sub.2] - [T.sub.1] x 100; Where, [W.sub.1] = initial live body weight (g) at time [T.sub.1] (day) [W.sub.2] = final live body weight (g) at time [T.sub.2] (day). Feed Conversion Ratio (FCR) = Dry weight (g) of feed supplied /Live weight (g) of fish gained

Source of Information: International Journal of Fisheries and Aquatic Research; Volume 3; Issue 1; January 2018; Page No. 22-26, ISSN: 2456-7248;

Article Link (Online Journal): www.fishjournals.com

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The growth and survival of Tengra (M. vittatus) fingerlings were inversely related to the stocking densities of fry in the experimental nursery ponds. In all respects, 8,000 fry dec-1 was the highest performances than those obtained at higher stocking rates. However, stocking density of 8,000 fry dec-1 may be suggested for rearing of Tengra (M. vittatus) fingerlings over 7 (Seven) weeks in single stage nursing rearing system in northern region of Bangladesh and extremely helpful towards the protection of this species from extinction.

Knowledge Management: Journal