LEARNING-CARE CENTRE: Educational materials for science students in Senior Secondary School

  CHAPTER ELEVEN MATERIALS REQUIRED FOR CAPTURE IN FISHERY 11.1                          FISHING METHODS                                                                                               Fishing method means how the fishing gears are used. There are different method uses to catch fish. The majority of method has an adverse effect on the marine environment in term of by catch damage to the seabed and negative effects on the marine food web. Fi...

CHAPTER TEN MANAGEMENT IN FISH CULTURE Culture management involves all practices or activities carried out in fish culture facilities aimed at ensuring a healthy environment to increase fish yield. 10.1                         POND MANAGEMENT PRACTICES 1.     LIMING : Liming is applied by broadcasting the lime across the water bodies. It may be applied to kill predators and parasites. It also prevents water loss. Liming materials are quicklime, calcium hydroxide, calcium carbonate, calcium silicate, wood ash, gypsum and calcium bicarbonate. Functions of lime in a fish pond -It encourage the growth of plankton.       -The productivity of the pond is improved by liming. -It prevent water loss in the pond. -It help prevent wide swing in P H . -To correct the acidity in the pond. - It aid the effect of...