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Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs. Vapor accidents can occur when pressure builds up in the tank below and the Butterworth cover is carelessly removed. [5] Butterworth hatches have been responsible for a number of marine losses. [6]
Fish kettle – a large, oval-shaped kettle used for cooking whole fish. Owing to their necessarily unwieldy size, fish kettles usually have racks and handles, and notably tight-fitting lids; French tian – an earthenware vessel of Provence, France, used both for cooking and serving
An expansion tank or expansion vessel is a small tank used to protect closed water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer [ citation needed ] and absorbs excess water pressure caused by thermal expansion .
Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [1] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a suitable habitat for fish. [ 2 ]
A nature style aquascape, suggesting mountains. A contrasting approach is the "nature aquarium" or Japanese style, introduced in the 1990s by Takashi Amano. [1] Amano's three-volume series, Nature Aquarium World, sparked a wave of interest in aquarium gardening, and he has been cited as having "set a new standard in aquarium management". [9]
The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish (but not cartilaginous fish [1]) that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, which expends more energy. [2]
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