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Figure 15: Those working near or on equipment must take precautions to assure that the power in the breaker box is turned off and locked. The Lock Out–Tag Out system should be practiced; a worker doing equipment repairs locks the breaker box in the off position and a second worker working on another piece of equipment coming off of the same breaker box also locks the breaker box switch so that one worker does not complete his job and then return to the breaker box to turn it back on while the other worker is still working on his piece of equipment.

Figure 12: The side-mounted walkway on this fish hauling truck is swung down to be used as a walking and standing platform during loading and unloading of fish. Most live haul trucks have this hinged platform, but the unique feature on this truck is the retractable guardrail that rolls out from the tanks.

Figure 16: This ground fault interrupter (GFI, also called a ground fault circuit interrupter, GFCI) is used in the power box of a permanent electric paddlewheel aerator. On this farm, two workers were in the pond rewiring a paddlewheel aerator (all power was turned off while they were working on the wiring). After they finished the rewiring, a third worker turned the aerator on prematurely while they were still in the water (one waistdeep and the other ankle-deep). Both men received heavy electrical jolts, especially the worker who was waist-deep. The shock occurred because the workers had erroneously connected the ground wire to the hot, and the hot wire to the ground.

Figure 13: The netting mounted on the wooden frames keeps birds and other predators out of the trout raceways and can also break workers’ falls, preventing possible drowning. The neat mounting of the netting also helps to prevent entanglement that may occur if it were loosely draped over the raceways.

Figure 14: This PTO shield is cut near the tractor to allow for lubrication to be applied. The farm owner recommended that PTO shield manufacturers provide a way to lubricate the PTO shaft without having to remove the shield. PTO shields protect farm workers from getting caught and entangled in this rapidly spinning tractor part.

Figure 17: Trout farm waste in North Carolina is collected in concrete reservoirs where it is held until it can be used for things such as agricultural field fertilization. Drowning and exposure to toxic fumes are potential hazards in these concrete tanks. Geo-tubes are an alternative waste collection method. Hydrogen sulfide and carbon dioxide are decomposition products from fish waste. Both gases are heavier than air (i.e., have a higher specific gravity) and both can accumulate, even in an open topped tank. Even when tanks are empty or nearly empty, workers entering tanks for cleaning and maintenance can be overcome by harmful gases. Unconsciousness can result in a few seconds and death shortly thereafter. Even worse is that approximately one third of such deaths are to other workers who entered such structures to rescue a colleague and, as a result, also died.

Fish Farming Technology | INTERNATIONAL AQUAFEED | 005

Mar | Apr 2015 - International Aquafeed magazine  
Mar | Apr 2015 - International Aquafeed magazine  

The March - April 2015 edition of International Aquafeed magazine