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Comparative Efficacy of Fertilizers Applications on the Production of Fry of Mystus Gulio (hamilton) in Nursery Ponds

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

S. B. Saha
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna.

M. S. Khatun
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna.

Abstract/ Executive Summary:

Efficacy of different fertilizers on the growth and survival of brackish water catfish, Mystus gulio (Hamilton) fry in nursery ponds has been evaluated with three fertilizer treatments (T) viz., T₁ - only organic (cattle dung @ 5 tons/ha), T₂ - only inorganic (urea @ 50 kg/ha + TSP @ 60 kg/ha) and T₃ - mixture of organic + inorganic (cattle dung @ 2.5 tons/ha + urea @ 25 kg/ha +TSP @ 30 kg/ha). After four weeks rearing, survival of fry was highest (69.35 ± 8.79%) in T₁ which was significantly higher than those of T₂ (46.01 ± 4.17%) and T3 (57.19 ± 6.22). But no significant difference in final length (2.70 - 2.79cm) and final weight (0.83 - 0.93 g) among three treatments was observed. Physicochemical variables of water and plank tons of different treatments were recorded and discussed.

Keywords: Mystus gulio, Survival, Growth, Supplementary feed, Fertilizers

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

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

To evaluate the effect of fertilizer on the growth and survival of brackish water catfish, M. gulio fries in nursery ponds.

Methodology:

Effect of different fertilizers on the growth and production of brackish water catfish, Mystus gulio was carried out in nine nursery ponds of 60 m² each following the experimental design. The ponds were prepared by sun drying followed by liming soil with CaO @ 250 kg/ha and then filling with tidal brackish water up to 100 cm depth. Water of the ponds was treated with rotenone @1.5 ppm to kill unwanted fishes and then with dolomite @ 20 ppm to increase the buffer capacity of the ponds. After 5 days, particular pond was fertilized with respective fertilizers and dose as given in the experimental design. Five days after fertilization, dipterex @ 1 ppm was spread over the water surface followed by netting for mixing uniformly to kill aquatic crustaceans and insects. Twenty four hours after spreading of dipterex, four days old hatchlings (average length, 5 mm) of M. gulio were stocked uniformly @ 250 Nos/m² in all ponds. From the second day of stocking, fish hatchlings were fed twice daily with a mixture of finely powdered mustard oil cake, rice bran and fish meal at the ratio of 2:3:5. The mixed feed contained approximately 30% protein. Feed was supplied @ 6 kg/million of hatchlings which was raised to 10 kg/ million hatchlings from the 6 th day of stocking. Subsequently, feed was increased by 5 kg/million of hatchlings every five days. In addition, from the first day of hatchlings stocking, the ponds were fertilized regularly at weekly interval with one fourth of the initial dose of fertilizer. Growth and well being of the fries were checked at weekly interval. Physico-chemical parameters of water viz., temperature, salinity, transparency, pH, dissolved oxygen (DO) and alkalinity were determined following standard methods and plankton samples were analyzed at four days interval. Temperature of water was determined by an alcohol thermometer, salinity by refractometer, transparency by Secchi disk, pH by pH meter and DO and alkalinity by titrimetric method as mentioned in APHA. After four weeks of nursing, fish fries were harvested first by repeated netting, followed by draining the ponds with consequent growth and survival of fingerlings were estimated.

Source of Information: Bangladesh J. Zool. 41(1): 21-27, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It has been observed that the extent of profit in commercial fry production processes largely dependent on the survival rate. Therefore, foods and other factors influence the growth and overall production of fry from per unit water area. Present study indicates that however, the growth of fishes was almost same in all the three treatments ponds, but survival rate was significantly high in ponds fertilized with only cattle dung. Physico- chemical conditions of all the ponds water were always convenient for the rearing of fry of the M. gulio, moreover, their growth to a large extent depends on the quality and quantity of feed available there in.

Knowledge Management: Journal