Abstract
Water parameters and egg hatching success in water from three boreholes within close proximity were investigated. The studies were conducted to ascertain differences in their quality and ability to support Clarias gariepinus egg hatching. The boreholes were tagged 300m, 400m and 330m in relation to their distances from a perennial stream within the vicinity. Temperature and pH were investigated using digital metres. Dissolved oxygen, alkalinity and total hardness were determined using titration method. The water parameters were measured twice a week for 5 weeks. Percentage egg hatching, time to commencement and termination of egg hatching were studied in triplicates. The results obtained showed that pH, Dissolve oxygen (DO), Alkalinity and total hardness were significantly different (P 0.05). Total hardness fluctuated most at 21% coefficient of variation (CV). Egg fertilization success was not significantly different (P>0.05). Percentage egg hatching (68.8%, 92.8% and 87.3% for 300m, 400m and 330m) respectively was significantly different (P<0.05). Higher coefficient of variation in hardness enhanced egg hatching. It could be induced in hatchery operations. Time to commencement (1443, 1453 and 1517) minutes and termination of hatching (1962, 1957 and 2037) minutes were significantly different (P<0.05). Larval survival by day-3 post hatch was significant[y different (P<0.05). The study provided evidence of disparity in water quality among the boreholes and revealed differences in their ability to support Clarias gariepinus egg hatching. These suggest carefulness in choice of borehole water for fish egg hatching regardless of proximity of boreholes. Keywords: Catfish, Propagation, Water and Egg
Highlights
The gap between demand and supply of fish in Nigeria has continued to widen, making fish unaffordable to most Nigerians (Olayinka, 2013)
The annual fish demand in Nigeria as at 2012 was 2,656,739 tonnes when the domestic production was reported at 700,739 tonnes (Ayinla, 2012)
Fish seeds are very expensive in Nigeria
Summary
25ml of water sample was placed in 250 ml clean conical flask and 3 ml of Ammonium chloride was added followed with addition of 2 drops of Eriochrome Black T indicator. This was titrated against 0.01M EDTA solution until there was a colour change from violet to blue. Alkalinity: The reagents used were concentrated sulphuric acid (H2SO4), Distilled water and Phenolphthalin indicator. H2SO4 was mixed with 1 litre of distilled water to obtain the stock solution. 10 drops of phenolphthalein indicator was added to the sample water and a pink solution was obtained. Egg hatching in water from different boreholes: Eggs from a female C. gariepinus were fertilized with milt
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