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Barrel has also been used as a standard size of measure, referring to a set capacity or weight of a given commodity. For example, in the UK and Ireland, a barrel of beer refers to a quantity of 36 imperial gallons (160 L; 43 US gal), and is distinguished from other unit measurements, such as firkins , hogsheads , and kilderkins . [ 7 ]
A French standard tun cask size was established about 1450. [ 3 ] : 9 The 15th century Bordeaux wine tun was between 240 and 252 imperial gallons (1,090 and 1,150 L; 288 and 303 US gal). [ 4 ] : 378–379 [ a ] When measuring the tonnage of a ship, the approximately cylindrical cask would have air space around it when stowed in a ship.
Cube – The cargo carrying capacity of a ship, measured in cubic metres or feet. There are two common types: Bale Cube (or Bale Capacity) – The space available for cargo measured in cubic metres or feet to the inside of the cargo battens, on the frames, and to the underside of the beams. It is a measurement of capacity for cargo in bales or ...
Standard length (SL) is the length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the hypural plate. This measurement excludes the length of the caudal (tail) fin. [1] Total and fork length of a fish
Carrying capacity – the supportable population of a species, given the food, habitat conditions and other resources available within a fishery. Casting – the act of throwing bait or a lure over the water, using a fishing rod. Catadromous – fish that live their adult lives in fresh water lakes or rivers but migrate down rivers to spawn in ...
Pacific oyster females are very fecund, and individuals of 70–100 g live weight can produce 50–80 million eggs in a single spawn. [10] Broodstock adults are held in tanks at 20–22 °C, supplied with cultured algae and with salinities of 25–32 ppt. [10] These individuals can be induced to spawn by thermal shock treatment. [10]
The most common type of saltwater fish tank, the tropical marine tank, houses marine animals from tropical climates. Usually kept between 24 and 28 °C (75 and 82 °F), these tanks include tropical reef tanks, as well as fish-only tanks. These tanks tend to have a low concentration of microscopic plankton and other foods eaten by filter feeders.
The maximum load of organisms that can be cultured in a raceway system depends on the species, and particularly on the size of the species. For trout, stocking rates of 30 to 50 kg/m 3 are normal at the end of a rearing cycle, while for marine species, such as sea bass and sea bream, the achievable load is lower, between 15 and 20 kg/m 3.
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