FISH HEALTH .

Fish should be observed on a regular basis for signs of ill health,stress or any discomfort.This is the main reason why you must master your fish behavior;swimming patterns,feeding and response to stimuli so that any changes will be noticed and addressed. There must be an operational protocol,where the pipe works, pumps and general system are checked for leaks,damage,breaks or blockages . The pond is the controlled environment of the fish,and the health status of the fish is hinged on its stability and balance. Potential problems /deaths in ponds has been traced to biofilters.When nitrogenous wastes accumulate in ponds,they increase ammonia levels in ponds,causing death of microrganism in the biofilters which results in mass death of fish. The water parameters are to be checked at regular intervals as these are indicators of fish health status; dissolved oxygen,temperature,ammonia level,nitrate,nitrite,pH and phosphate are very important. Fish health can be judged good/bad based on observation.When fish are flicking or flashing its an indication of parasitic infestation or high nitrite concentration in water.Fish jumping also indicate parasitic infestation,gill problems or irritating contaminates in water. Rubbing against fish tank/wall is a clear indication of parasitic infestation.Stress is to be suspected when fish are swimming slowly,resting down in the pond and refusal of feed.Mucus covered fish points to stress as well as parasitic infestation Fish gasping for fresh air on water surface,or hanging around water inlet indicate a low level of dissolved oxygen in the pond. Parasitic infection could be by bacteria,fungi or viruses.Parasites could infect or infest the body of fish as in the case of fish lice,which causes severe irritation. When fish is observed with clamped fins,red streaks on skin its indicative of a bacterial infection,while whitish spots on fish giving a cotton-wool appearance is indicative of viral infection,these are usually complicated by secondary bacterial infection. Fish could also show lumps or pox-like lesion as in the case of carp pox,these usually disintegrate leaving ulcers that are also complicated by bacteria.Worms also affect health of fish,tapeworms in fish cause a change in body color resulting in dark-colored fish ,that are weak and swimming with open mouths The anchor worm causes proliferation of muscle. Fish farms must have some materials to facilitate easy management ,ease handling and ensure survival and health of fish.These include nets,water kit,bowl,gloves and indicator paper.

WATER RELATED PROBLEMS IN FISH FARMING.

Water parameters play a vital role in fish farming,these parameters are directly related to the stocking density ,feed and feeding technique.Oxygen levels in the pond must be maintained at 4mg/litre. The concentration can be altered when the weather changes such as excessive high temperature,this reduces the solubility of oxygen in the pond.This results in suffocation of the fish in the pond,this results in high mortality. The dissolved oxygen level is usually depleted in cases of heavy algae bloom,this results from excess use of manure in the pond.The amount of feed given at any point in time also imparts the level of oxygen.when there is overfeeding or just after feeding of the fish and there are excess feed in the pond because there is an increase in demand of oxygen to digest the feed.Overcrowding in the pond due to overstocking also depletes the oxygen concentration. The fish show signs when the water parameters are altered or when there is a compromise due to pathogenic agent.The fish crowd near the water surface gasping for air,they reject feed,they dont respond to noise and their sputum remains undissolved on water surface. The water in the pond should be changed and replaced with fresh water,stop feeding at this period and stop fertilization of the pond.The oxygen level is corrected by aerating the pond using air pumps/aerators to increase oxygen level. Ammonia level( 0.05mg/litre) is also another important health indicator.The feed components are the key factors,when feed content are not properly metabolized,they give off high levels of ammonia in waste material,leading to contamination of pond due to accumulation of waste at the bottom of the pond.The pond could also have high levels of ammonia,if there is a contamination of ponds by sewage waste due to a leak from sewage pipes. The fish responds by reducing feed intake and also come to the surface for air.The ammonia level can be corrected by using more easily metabolized feed ;this can be achieved by using atovi premix in fish feed.This ensures proper metabolism of feed without any ammonia buildup,thus maintaining the regular level of ammonia.The atovi premix acts on the feed,fish and water in the pond(read more about atovi and fish in previous posts).In ponds where atovi feed is not used,the pond level must be reduced,it must be flushed and clean water is added to oxygenate pond. Foul smelling /odor in the pond this is usually as a result of feeding uncooked offal's to the fish,this is a major cause of pollution in fish pond. The uncooked offal s usually crowd/clog the water surface,depleting oxygen concentration ,giving off foul odor with resultant death of fish. The effect is reversed by removing left over offal s on water surface,flush pond and fill pond with fresh clean water.The use of uncooked offal's should be stopped and use compounded ration instead. Fish health is hinged on good water parameters,feed quality,quantity and frequency of feeding,hence much attention must be given to these factors.Observation and good management protocol are the keys for a successful fish farming venture.